UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                               ------------------
                                    FORM 11-K
                               ------------------

                     ANNUAL REPORT PURSUANT TO SECTION 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934


(Mark one)

[X]  ANNUAL report pursuant to Section 15(d) of the Securities Exchange Act of
     1934

     For the fiscal year ended December 31, 2006

                    or

[_]  Transition report pursuant to Section 15(d) of the Securities Exchange Act

             For the transition period from _________ to ___________

Commission file number 001-10533


A.   Full title of the plan and the address of the plan, if different from that
     of the issuer named below:

             KENNECOTT CORPORATION SAVINGS PLAN FOR HOURLY EMPLOYEES

B.   Name of issuer of the securities held pursuant to the Plan and the address
     of its principal executive office:

         Rio Tinto plc, 6 St. James's Square, London, SW1Y 4LD, England


                                  Page 1 of 23










               KENNECOTT CORPORATION SAVINGS PLAN
               FOR HOURLY EMPLOYEES


               FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULE

               AS OF DECEMBER 31, 2006 AND 2005 AND FOR THE YEAR
               ENDED DECEMBER 31, 2006

               TOGETHER WITH REPORT OF INDEPENDENT REGISTERED PUBLIC
               ACCOUNTING FIRM







                                  Page 2 of 23



                                             KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                               TABLE OF CONTENTS
--------------------------------------------------------------------------------

                                                                            PAGE
                                                                            ----

Report of Independent Registered Public Accounting Firm                        4

Financial Statements:

   Statements of Assets Available for Benefits as of
     December 31, 2006 and 2005                                                6

   Statement of Changes in Assets Available for Benefits
     for the year ended December 31, 2006                                      7

Notes to Financial Statements                                             8 - 18

Supplemental Schedule - Schedule H, Part IV, line 4i -

Schedule of Assets (Held at End of Year) as of December 31, 2006         19 - 20





All other schedules required by Section 2520.103-10 of the Department of Labor's
Rules and Regulations for Reporting and Disclosure under the Employee Retirement
Income Security Act of 1974 have been omitted because they are not applicable to
the Kennecott Corporation Savings Plan for Hourly Employees.



                                  Page 3 of 23


                                         REPORT OF INDEPENDENT REGISTERED PUBLIC
                                                                 ACCOUNTING FIRM




The Plan Administrator (Vice President, Human Resources -
  Kennecott Utah Copper Corporation)
Kennecott Corporation Savings Plan for Hourly Employees


We have audited the accompanying statements of assets available for benefits of
the Kennecott Corporation Savings Plan for Hourly Employees (the Plan) as of
December 31, 2006 and 2005 and the related statement of changes in assets
available for benefits for the year ended December 31, 2006. These financial
statements are the responsibility of the Plan's management. Our responsibility
is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audits to obtain reasonable assurance about whether the
financial statements are free of material misstatement. An audit includes
consideration of internal control over financial reporting as a basis for
designing audit procedures that are appropriate in the circumstances, but not
for the purpose of expressing an opinion on the effectiveness of the Plan's
internal control over financial reporting. Accordingly, we express no such
opinion. An audit includes examining, on a test basis, evidence supporting the
amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the assets available for benefits of the Kennecott
Corporation Savings Plan for Hourly Employees as of December 31, 2006 and 2005,
and the changes in assets available for benefits for the year ended December 31,
2006 in conformity with U.S. generally accepted accounting principles.

As described in Notes 2 and 3, the Plan adopted Financial Accounting Standards
Board Staff Position AAG INV-1 and SOP 94-4-1, Reporting of Fully
Benefit-Responsive Investment Contracts Held by Certain Investment Companies
Subject to the AICPA Investment Company Guide and Defined Contribution Health
and Welfare and Pension Plans, as of December 31, 2006.



                                  Page 4 of 23


Our audits of the financial statements were performed for the purpose of forming
an opinion on the basic financial statements taken as a whole. The supplemental
Schedule of Assets (Held at End of Year) as of December 31, 2006 is presented
for the purpose of additional analysis and is not a required part of the basic
financial statements, but is supplementary information required by the United
States Department of Labor's Rules and Regulations for Reporting and Disclosure
under the Employee Retirement Income Security Act of 1974. The supplemental
schedule is the responsibility of the Plan's management and has been subjected
to the auditing procedures applied in the audits of the basic financial
statements and, in our opinion, is fairly stated in all material respects in
relation to the basic financial statements taken as a whole.



/s/ Tanner LC



Salt Lake City, Utah
July 6, 2007







                                  Page 5 of 23


                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                     STATEMENTS OF ASSETS AVAILABLE FOR BENEFITS

                                                                    DECEMBER 31,
--------------------------------------------------------------------------------

                                                           2006        2005
                                                       -------------------------
ASSETS                                                             (As Restated)
------

Investments, at fair value                             $52,059,493   $47,408,947
                                                       -------------------------

Receivables:
  Employee contributions                                    96,521          --
  Employer contributions                                    29,429          --
                                                       -------------------------

          Total receivables                                125,950          --
                                                       -------------------------

Assets available for benefits, at fair value            52,185,443    47,408,947

Adjustment from fair value to contract value for
  fully benefit-responsive investment contracts            149,419       121,226
                                                       -------------------------

Assets available for benefits                          $52,334,862   $47,530,173
                                                       =========================



--------------------------------------------------------------------------------
See accompanying notes to financial statements.

                                  Page 6 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                           STATEMENT OF CHANGES IN ASSETS AVAILABLE FOR BENEFITS

                                                    YEAR ENDED DECEMBER 31, 2006
--------------------------------------------------------------------------------

ADDITIONS TO ASSETS ATTRIBUTED TO:
  Contributions:
    Employee                                                         $ 2,540,657
    Employer                                                             731,130
                                                                     -----------

          Total contributions                                          3,271,787
                                                                     -----------

Investment income:
  Net appreciation in fair value of investments                        3,020,817
  Interest and dividends                                               2,506,541
                                                                     -----------

          Total investment income                                      5,527,358
                                                                     -----------

          Total additions                                              8,799,145
                                                                     -----------

DEDUCTIONS FROM ASSETS ATTRIBUTED TO:
  Transfers to the Rio Tinto America Inc. Savings Plan                   813,880
  Benefits paid to participants                                        3,157,578
  Administrative expenses                                                 22,998
                                                                     -----------

          Total deductions                                             3,994,456
                                                                     -----------

Increase in assets available for benefits                              4,804,689

ASSETS AVAILABLE FOR BENEFITS:
  Beginning of year                                                   47,530,173
                                                                     -----------

  End of year                                                        $52,334,862
                                                                     ===========

--------------------------------------------------------------------------------
See accompanying notes to financial statements.

                                  Page 7 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS

--------------------------------------------------------------------------------

1.   DESCRIPTION         The  following  brief   description  of  the  Kennecott
     OF THE PLAN         Corporation  Savings  Plan for  Hourly  Employees  (the
                         Plan) is  provided  for  general  information  purposes
                         only.  Participants  should refer to the Plan  document
                         and the  summary  plan  description  for more  complete
                         information.

                         GENERAL
                         The Plan is a defined  contribution  plan  covering all
                         full-time  hourly  employees who are  represented by or
                         included in a collective  bargaining  unit of Kennecott
                         Utah   Copper    Corporation    and   its    affiliates
                         (collectively, the Company or the Employer), as defined
                         in  the   Plan   document.   Eligible   employees   can
                         participate in the Plan  immediately  after  completing
                         three  months of  continuous  service.  Kennecott  Utah
                         Copper   Corporation   is  an  indirect   wholly  owned
                         subsidiary  of Rio  Tinto  America, Inc.,  which  is an
                         indirect wholly owned  subsidiary of Rio Tinto plc (the
                         Parent).  The  Plan  is  intended  to  be  a  qualified
                         retirement  plan under the Internal  Revenue Code (IRC)
                         and is  subject  to  the  provisions  of  the  Employee
                         Retirement  Income  Security  Act of 1974  (ERISA),  as
                         amended.

                         CONTRIBUTIONS
                         Each  year,  participants  may  elect  under  a  salary
                         reduction agreement to contribute to the Plan an amount
                         not  less  than  1% and  not  more  than  19% of  their
                         eligible  compensation  on a before-tax  basis  through
                         payroll  deductions.  Contributions  are limited by the
                         IRC,  which  established  a  maximum   contribution  of
                         $15,000 ($20,000 for participants  over age 50) for the
                         year ended December 31, 2006. Participant contributions
                         are recorded in the period during which the amounts are
                         withheld from  participant  earnings.  Participants may
                         also contribute amounts representing distributions from
                         other qualified defined benefit or defined contribution
                         plans.

                         The Company matches the participant's  contributions to
                         the Plan at 50%,  up to the first 6% of their  eligible
                         compensation.  Matching  contributions  are recorded on
                         the  date the  related  participant  contributions  are
                         withheld.

--------------------------------------------------------------------------------
                                  Page 8 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

1.   DESCRIPTION         PARTICIPANT ACCOUNTS
     OF THE PLAN         Individual   accounts  are  maintained  for  each  Plan
     CONTINUED           participant.  Each  participant's  account is  credited
                         with the  participant's  contributions,  the  Company's
                         matching contribution,  and an allocation of the Plan's
                         earnings,  and  is  charged  with  withdrawals  and  an
                         allocation  of the  Plan's  losses  and  administrative
                         expenses. Allocations are based on participant earnings
                         or account balances, as defined. The benefit to which a
                         participant  is  entitled  is the  benefit  that can be
                         provided from the participant's vested account.

                         PARTICIPANT-DIRECTED OPTIONS FOR INVESTMENTS
                         Participants    direct   the    investment   of   their
                         contributions  and the Company  matching  contributions
                         into various  investment  options  offered by the Plan.
                         Investment  options include a money market fund, common
                         collective trusts,  mutual funds,  synthetic guaranteed
                         investment  contracts and common stock of the Parent in
                         the form of American Depository Receipts (ADRs).

                         VESTING
                         Participants   are   immediately    vested   in   their
                         contributions plus actual earnings thereon.  Vesting in
                         the Company's contribution portion of their accounts is
                         based on years of continuous  service. A participant is
                         100%  cliff   vested  after  three  years  of  credited
                         service.

                         PAYMENT OF BENEFITS
                         On termination of service due to death, disability,  or
                         retirement,  participants  or their  beneficiaries  may
                         elect to receive a lump-sum  distribution  in an amount
                         equal  to  the  value  of  the   participants'   vested
                         interests   in   their    accounts.    Under    certain
                         circumstances,    participants   may   withdraw   their
                         contributions prior to the occurrence of these events.

                         TRANSFERS
                         Along with the Plan, the Company also sponsors  another
                         401(k) plan that covers non-represented  employees.  If
                         employees  change from union to non-union status during
                         the year,  their account  balances are transferred from
                         the Plan to the non-union plan;  namely,  the Rio Tinto
                         America Inc.  Savings Plan. For the year ended December
                         31, 2006, transfers out of the Plan totaled $813,880.

--------------------------------------------------------------------------------
                                  Page 9 of 23


                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

1.   DESCRIPTION         FORFEITED ACCOUNTS
     OF THE PLAN         Forfeited  non-vested  participant account balances may
     CONTINUED           be used to reduce future Company  contributions  to the
                         Plan. During the year ended December 31, 2006,  $22,523
                         was used to pay Plan expenses.  Forfeitures were $4,168
                         for the year ended  December  31,  2006.  Interest  and
                         dividends attributable to the forfeitures were $658 for
                         the year ended  December 31,  2006.  As of December 31,
                         2006 and 2005,  the balance of the  forfeiture  account
                         was $4,328 and $22,025, respectively.

2.   SUMMARY OF          BASIS OF PRESENTATION
     SIGNIFICANT         The financial statements of the Plan have been prepared
     ACCOUNTING          on the accrual basis of  accounting in accordance  with
     POLICIES            U.S. generally accepted accounting principles.

                         USE OF ESTIMATES
                         The preparation of the Plan's  financial  statements in
                         conformity  with  U.S.  generally  accepted  accounting
                         principles  requires Plan  management to make estimates
                         and  assumptions  that affect the  reported  amounts of
                         assets  available  for  benefits  at  the  date  of the
                         financial  statements,  the changes in assets available
                         for  benefits  during the  reporting  period and,  when
                         applicable,  the  disclosures of contingent  assets and
                         liabilities  at the date of the  financial  statements.
                         Actual results could differ from those estimates.

                         RISKS AND UNCERTAINTIES
                         The Plan provides for  investments  in securities  that
                         are exposed to various  risks,  such as interest  rate,
                         currency  exchange  rate,  credit  and  overall  market
                         fluctuation.  Due to the level of risk  associated with
                         certain   investment   securities,   it  is  reasonably
                         possible  that  changes  in the  values  of  investment
                         securities  will  occur in the near  term and that such
                         changes could materially affect  participants'  account
                         balances and the amounts  reported in the statements of
                         assets available for benefits.


--------------------------------------------------------------------------------
                                 Page 10 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

2.   SUMMARY OF          ADOPTION OF NEW FINANCIAL ACCOUNTING STANDARD
     SIGNIFICANT         In December  2005, the Financial  Accounting  Standards
     ACCOUNTING          Board (FASB) issued a Staff Position  (FSP),  Reporting
     POLICIES            of Fully  Benefit-Responsive  Investment Contracts Held
     CONTINUED           by Certain  Investment  Companies  Subject to the AICPA
                         Investment  Company  Guide  and  Defined   Contribution
                         Health and Welfare and Pension  Plans.  This FSP amends
                         the  guidance  in AICPA  Statement  of  Position  94-4,
                         Reporting of  Investment  Contracts  Held by Health and
                         Welfare   Benefits   Plans  and  Defined   Contribution
                         Pensions Plans, with respect to the definition of fully
                         benefit-responsive   investment   contracts   and   the
                         presentation and disclosure of fully benefit-responsive
                         investment contracts in Plan financial statements.  The
                         FSP  requires  investment  contracts to be presented at
                         fair value in the  statement  of assets  available  for
                         benefits.

                         However,  contract  value is the  relevant  measurement
                         attribute for that portion of the assets  available for
                         benefits of a defined contribution plan attributable to
                         fully  benefit-responsive  investment contracts because
                         contract value is the amount participants would receive
                         if they were to initiate  permitted  transactions under
                         the terms of the Plan.  Therefore,  as  required by the
                         FSP,  the  statement of assets  available  for benefits
                         presents the fair value of the investment  contracts as
                         well as the adjustment of the fully  benefit-responsive
                         investment contracts from fair value to contract value.
                         The  statement  of  changes  in  assets  available  for
                         benefits is prepared on a contract value basis.

                         The  FSP is  effective  for  financial  statements  for
                         annual periods ending after December 15, 2006, and must
                         be   applied   retroactively   to  all  prior   periods
                         presented.   Accordingly,  the  Plan  has  adopted  the
                         financial   statement   presentation   and   disclosure
                         requirements  effective  December  31,  2006,  and  has
                         restated  the 2005  statement of assets  available  for
                         benefits to present all investments at fair value, with
                         the adjustment to contract value separately  disclosed.
                         The  effect  of  adopting  the FSP had no impact on the
                         Plan's  assets  available  for  benefits  or changes in
                         assets available for benefits, as such investments have
                         historically been presented at contract value. Refer to
                         Note 3 for additional information related to the Plan's
                         fully benefit-responsive investment contracts.

--------------------------------------------------------------------------------
                                 Page 11 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

2.   SUMMARY OF          INVESTMENT VALUATION AND INCOME RECOGNITION
     SIGNIFICANT         The Plan's  investments  in mutual  funds are valued at
     ACCOUNTING          quoted  market  prices,  which  represent the net asset
     POLICIES            values  of  units  held by the Plan at year  end.  Plan
     CONTINUED           investments  in common  stock are  stated at fair value
                         based on quoted market prices. Common collective trusts
                         are valued at the asset value per unit as determined by
                         each common  collective trust as of the valuation date.
                         The fair  value of the  Plan's  interest  in the Dwight
                         Stable Value Fund (see detail of  investments  included
                         in this fund in Note 3) is based upon the market  value
                         of the underlying  securities at quoted market value or
                         quoted share prices.

                         Purchases  and sales of  securities  are  recorded on a
                         trade-date  basis.  Interest  income is recorded on the
                         accrual   basis.   Dividends   are   recorded   on  the
                         ex-dividend date.

                         The net appreciation  (depreciation)  in the fair value
                         of investments  which includes  realized gains (losses)
                         and  unrealized  appreciation  (depreciation)  on those
                         investments is presented in the statement of changes in
                         assets  available for benefits of the Plan, and totaled
                         $3,020,817  for the year ended  December  31, 2006 (see
                         Note 5).

                         PAYMENTS OF BENEFITS
                         Benefits payments are recorded when paid by the Plan.

                         ADMINISTRATIVE EXPENSES
                         The Company  pays the  majority  of costs and  expenses
                         incurred in administering the Plan.

                         The Plan has  several  fund  managers  that  manage the
                         investments  held by the Plan.  During  the year  ended
                         December  31,  2006,  the Company  paid all  investment
                         management fees related to these investment funds.

                         The investment  management  fees related to transaction
                         costs associated with the purchase or sale of Rio Tinto
                         plc ADRs are paid by the participants.

                         PARTICIPANT LOANS
                         Loans are not permitted to be made to  participants  in
                         the Plan.

--------------------------------------------------------------------------------
                                 Page 12 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

3.   FULLY BENEFIT-      The Plan's investments  include the Dwight Stable Value
     RESPONSIVE          Fund.  The Dwight  Stable Value Fund is invested in the
     INVESTMENT          following:
     CONTRACTS
                         o A money market fund (the Mellon Bank - STIF Account);

                         o A fully  benefit-responsive  common  collective trust
                           (the SEI Stable Asset Fund); and

                         o Fully    benefit-responsive    synthetic   guaranteed
                           investment contracts (GICs) as follows:

                              a. Synthetic  GIC,  Dwight  Managed  Target  2, no
                                 specified  maturity date,  5.27%;
                              b. Synthetic  GIC,  Dwight  Managed  Target  5, no
                                 specified maturity date, 5.27%;
                              c. Synthetic  GIC,  Dwight  Managed  Target  5, no
                                 specified  maturity date,  5.67%;
                              d. Synthetic GIC, Dwight Core International  Fund,
                                 no specified maturity date, 5.77%;
                              e. Synthetic  GIC,  Dwight  Managed  Target  2, no
                                 specified maturity date, 4.79%; and
                              f. Synthetic  GIC,  Dwight  Managed  Target  5, no
                                 specified maturity date, 4.79%.

                         Synthetic  GICs  provide  for a  guaranteed  return  on
                         principal over a specified period of time through fully
                         benefit-responsive  wrap  contracts,  issued by a third
                         party,  which are  secured by  underlying  assets.  The
                         portfolio of assets  underlying  the synthetic GICs has
                         an overall AAA credit  quality and includes  mortgages,
                         fixed  income  securities  and United  States  treasury
                         notes and bonds.

                         The wrap contracts are obligated to provide an interest
                         rate not less  than  zero.  These  contracts  typically
                         provide that realized and  unrealized  gains and losses
                         on the underlying assets are not reflected  immediately
                         in the  assets of the  fund.  Realized  and  unrealized
                         gains and losses are  amortized,  usually over the time
                         to   maturity  or  the   duration  of  the   underlying
                         investments, through adjustments to the future interest
                         crediting rate.

--------------------------------------------------------------------------------
                                 Page 13 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

3.   FULLY BENEFIT-      The contract or crediting  interest  rates for the GICs
     RESPONSIVE          are  typically  reset  quarterly  and are  based on the
     INVESTMENT          market  value of the  portfolio  of  assets  underlying
     CONTRACTS           these contracts. Inputs used to determine the crediting
     CONTINUED           interest rates include each contract's portfolio market
                         value, current yield-to-date  maturity,  duration,  and
                         market value relative to contract value.

                         These wrap contracts  provide  benefit  withdrawals and
                         investment  exchanges at the full contract value of the
                         synthetic  contracts  (principal plus accrued interest)
                         notwithstanding   the  actual   market   value  of  the
                         underlying   investments   (fair  value  plus   accrued
                         interest). There are no reserves against contract value
                         for credit risk of the contract issuer or otherwise.

                         Certain  events  may limit the  ability  of the Plan to
                         transact  at  contract  value  with the issuer of fully
                         benefit-responsive  investment  contracts.  Such events
                         include  the  following:  (1)  amendments  to the  Plan
                         documents   (including   complete   or   partial   plan
                         termination   or  merger  with   another   plan),   (2)
                         bankruptcy of the Company or other Company  events (for
                         example,  divestiture or spin-off of a subsidiary) that
                         cause a  significant  withdrawal  from the Plan, or (3)
                         the failure of the trust to qualify for exemption  from
                         federal   income  taxes  or  any  required   prohibited
                         transaction exemption under ERISA, as amended. The Plan
                         Administrator  does not believe that the  occurrence of
                         any such event, which would limit the Plan's ability to
                         transact  at  contract  value  with  participants,   is
                         probable.   The  contracts   provide  that  withdrawals
                         associated  with  certain  events  which are not in the
                         ordinary course of fund operations,  and are determined
                         by the issuer to have a material  adverse effect on the
                         issuer's financial interest,  may be paid at other than
                         contract value.

                         Absent the events described in the preceding paragraph,
                         the synthetic  guaranteed  investment  contracts do not
                         permit the issuers to terminate the agreements prior to
                         the scheduled maturity dates.

--------------------------------------------------------------------------------
                                 Page 14 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

3.   FULLY BENEFIT-      Average duration for all investment  contracts was 2.99
     RESPONSIVE          years at each of December  31,  2006 and 2005.  Average
     INVESTMENT          yield data for all fully benefit-responsive  investment
     CONTRACTS           contracts  as of  December  31,  2006  and  2005 was as
     CONTINUED           follows:

                         AVERAGE YIELDS:                       2006      2005
                         -------------------------------------------------------

                         Based on actual earnings              5.21%     4.80%
                         Based on interest rate credited
                           to participants                     5.12%     4.63%


4.   PARTIES-IN-         Certain   Plan   investments   are  managed  by  Putnam
     INTEREST            Investments,   the  Plan  trustee,   therefore,   these
     TRANSACTIONS        transactions are exempt party-in-interest transactions.
                         Fees  paid  by  the  Plan  for  investment   management
                         services  were  included as a  reduction  of the return
                         earned on each fund.

                         Transactions  associated  with Rio  Tinto  plc ADRs are
                         considered   exempt   party-in-interest    transactions
                         because Rio Tinto plc is the parent of the Company.  As
                         of December 31, 2006 and 2005,  the Plan held 32,446.29
                         and 33,950.034 shares, respectively, of common stock of
                         Rio Tinto  plc,  with a cost  basis of  $3,487,325  and
                         $3,053,212,   respectively.   During   the  year  ended
                         December 31, 2006, the Plan recorded dividend income of
                         $251,790 related to these shares.




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                                 Page 15 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

5.   INVESTMENTS         The  Plan's  investments  stated  at  fair  value  that
                         represented  five percent or more of the Plan's  assets
                         available for benefits as of December 31, 2006 and 2005
                         are as follows:

                                                           2006          2005
                                                       -----------   -----------

                         Assets of the Dwight Stable
                           Value Fund:
                              Mellon Bank Money Market
                                 STIF Account          $    76,051   $    98,038
                              Monumental Life
                                  Insurance Company
                                  Synthetic GICS         5,107,813     2,970,747
                              State Street Bank
                                Synthetic GICS           7,244,086     6,914,621
                              SEI Stable Asset Fund      4,017,384     4,320,784
                                                       -----------   -----------

                                                        16,445,334    14,304,190
                                                       -----------   -----------

                         Dodge and Cox Stock Fund        7,751,496     6,434,011
                         Rio Tinto plc ADRs              6,894,512     6,205,727
                         Putnam S&P 500 Index Fund       4,577,766     4,173,396
                         Putnam International Equity
                           Fund                          3,929,166     2,769,805
                         Putnam Voyager Fund             3,605,436     3,767,535
                         Artisan Mid Cap Fund            2,483,818     2,383,356



                         During the year ended  December  31,  2006,  the Plan's
                         investments  (including gains and losses on investments
                         bought  and  sold,  as well as held  during  the  year)
                         appreciated in value as follows:

                         Investments at fair value:
                           Common stock                            $   951,864
                           Mutual funds                              1,444,783
                           Common collective trusts                    624,170
                                                                   -----------
                         Net appreciation                          $ 3,020,817
                                                                   ===========

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                                 Page 16 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

6.   PLAN                The  terms  of the  Plan may be  amended,  modified  or
     TERMINATION         discontinued  after the  effective  date of the Savings
                         Plan  Agreement.   Such   amendment,   modification  or
                         discontinuance  may occur pursuant to negotiations  for
                         employees at Kennecott Utah Copper  Corporation who are
                         represented by the labor organizations that are jointly
                         referred to as the Union,  or as required by law, or to
                         gain  Internal  Revenue  Service  approval.  No change,
                         however,  shall  make it  possible  for any part of the
                         funds  of the  Plan  to be  used  for or  diverted  for
                         purposes  other  than  for  the  exclusive  benefit  of
                         participants and/or their  beneficiaries.  In addition,
                         no change  shall  adversely  affect  the  rights of any
                         participant with respect to contributions made prior to
                         the date of the change.

                         If the Plan is terminated in accordance  with the terms
                         described   in   the    preceding    paragraph,    each
                         participant's  account  shall  become  fully vested and
                         nonforfeitable and distribution of Plan assets shall be
                         made as directed by the Plan Administrator.

7.   INCOME TAX          The  Internal   Revenue   Service  has  determined  and
     STATUS              informed  the  Company by a letter  dated  December  9,
                         2002,  that the Plan and related trust were designed in
                         accordance  with  the  applicable  requirements  of the
                         Internal  Revenue Code. The Plan has been amended since
                         receiving the determination  letter;  however, the Plan
                         Administrator and the Plan's legal counsel believe that
                         the Plan is currently designed and is being operated in
                         compliance  with  the  applicable  requirements  of the
                         Internal  Revenue  Code.  Therefore,  no provision  for
                         income taxes has been included in the Plan's  financial
                         statements.

--------------------------------------------------------------------------------
                                 Page 17 of 23



                                              KENNECOTT CORPORATION SAVINGS PLAN
                                                            FOR HOURLY EMPLOYEES
                                                   NOTES TO FINANCIAL STATEMENTS
                                                                       CONTINUED

--------------------------------------------------------------------------------

8.   RECONCILIATION      The following is a  reconciliation  of assets available
     OF FINANCIAL        for benefits as presented in the  financial  statements
     STATEMENTS TO       as of December 31, 2006 to the Form 5500:
     FORM 5500
                           Assets available for benefits
                             as presented in the financial
                             statements                            $ 52,334,862
                           Adjustment from contract value to
                             fair value for fully
                             benefit-responsive investment
                             contracts                                 (149,419)
                                                                   -------------
                           Assets available for benefits
                             as presented in Form 5500             $ 52,185,443
                                                                   =============


--------------------------------------------------------------------------------
                                 Page 18 of 23




                                                                                                  KENNECOTT CORPORATION SAVINGS PLAN
                                                                                                                FOR HOURLY EMPLOYEES
                                                                                         EMPLOYER IDENTIFICATION NUMBER:  13-3108078
                                                                                                                   PLAN NUMBER:  204
                                                                                                        SCHEDULE H, PART IV, LINE 4i
                                                                                            SCHEDULE OF ASSETS (HELD AT END OF YEAR)

                                                                                                                   DECEMBER 31, 2006
------------------------------------------------------------------------------------------------------------------------------------

  (a)                 (b)                                     (c)                                         d)            (e)
PARTY IN                                                                                   NUMBER OF                  CURRENT
INTEREST       IDENTITY OF ISSUER                   DESCRIPTION OF INVESTMENT                UNITS       COST          VALUE
--------   ---------------------------   ----------------------------------------------   -----------    ----   --------------------

                                                                                                   
                                         MONEY MARKET FUND:
           Mellon Bank                   Mellon Bank - STIF Account                         76,051        **       $   76,051
                                                                                                                --------------------

                                         COMMON COLLECTIVE TRUSTS:
           SEI Investments               SEI Stable Asset Fund                           4,017,384        **        4,017,384
   *       Putnam                        Putnam S&P 500 Index Fund                         123,158        **        4,577,766
                                                                                                                --------------------
                                                  Total Common Collective Trusts                                    8,595,150
                                                                                                                --------------------

                                         MUTUAL FUNDS:
           Dreyfus                       Dreyfus Mid-Cap Value Fund                         39,563        **        1,269,176
           PIMCO                         PIMCO Total Return Fund                           207,450        **        2,153,334
           Morgan Stanley                MSDW Institutional International Equity Fund       40,227        **          827,869
           Dodge and Cox                 Dodge and Cox Stock Fund                           50,512        **        7,751,496
           Artisan                       Artisan Mid Cap Fund                               81,544        **        2,483,818
           UAM Trust Company             UAM/ICM Small Company Fund                         26,903        **        1,005,351
   *       Putnam                        Putnam Small Cap Fund                              49,680        **        1,106,383
   *       Putnam                        Putnam International Equity Fund                  124,577        **        3,929,166
   *       Putnam                        Putnam Voyager Fund                               190,361        **        3,605,436
                                                                                                                --------------------
                                                  Total Mutual Funds                                               24,132,029
                                                                                                                --------------------


* denotes a party-in-interest as defined by ERISA
** not required as investments are participant directed

------------------------------------------------------------------------------------------------------------------------------------
See accompanying report of independent registered public accounting firm.



                                  Page 19 of 23




                                                                                                  KENNECOTT CORPORATION SAVINGS PLAN
                                                                                                                FOR HOURLY EMPLOYEES
                                                                                         EMPLOYER IDENTIFICATION NUMBER:  13-3108078
                                                                                                                   PLAN NUMBER:  204
                                                                                                        SCHEDULE H, PART IV, LINE 4i
                                                                                            SCHEDULE OF ASSETS (HELD AT END OF YEAR)
                                                                                                                           CONTINUED

                                                                                                                   DECEMBER 31, 2006
------------------------------------------------------------------------------------------------------------------------------------

  (a)                 (b)                                     (c)                                         d)            (e)
PARTY IN                                                                                   NUMBER OF                  CURRENT
INTEREST       IDENTITY OF ISSUER                   DESCRIPTION OF INVESTMENT                UNITS       COST          VALUE
--------   ---------------------------   ----------------------------------------------   -----------    ----   --------------------

                                                                                                   
           Monumental Life Insurance     Synthetic GIC, Dwight Managed Target
             Company                       2, no specified maturity date, 5.27%                           **      $ 2,196,056
           Monumental Life Insurance     Synthetic GIC, Dwight Managed Target
             Company                       5, no specified maturity date, 5.27%                           **          912,460
           Monumental Life Insurance     Synthetic GIC, Dwight Managed Target
             Company                       5, no specified maturity date, 5.67%                           **        1,999,297
                                                                                                                --------------------
                                                                                                                    5,107,813
                                                                                                                --------------------
           State Street Bank             Synthetic GIC, Dwight Core Int Fund,
                                           no specified maturity date, 5.77%                              **        1,944,493
                                                                                                                --------------------
           State Street Bank             Synthetic GIC, Dwight Managed Target
                                           2, no specified maturity date, 4.79%                           **        4,698,108
           State Street Bank             Synthetic GIC, Dwight Managed Target
                                           5, no specified maturity date, 4.79%                           **          601,485
                                                                                                                --------------------
                                                                                                                    5,299,593
                                                                                                                --------------------
                                                  Total Synthetic Guaranteed
                                                    Investment Contracts                                           12,351,899
                                                                                                                --------------------

   *       Rio Tinto plc ADRs            Common Stock                                       32,446        **        6,894,512
                                                                                                                --------------------

   *       Putnam                        Pending Account                                     9,852        **            9,852
                                                                                                                --------------------

                                                  Total Investments at fair value                                 $52,059,493
                                                                                                                ====================


* denotes a party-in-interest as defined by ERISA
** not required as investments are participant directed

------------------------------------------------------------------------------------------------------------------------------------
See accompanying report of independent registered public accounting firm.                                                         19



                                  Page 20 of 23


                                    SIGNATURE
                                    ---------

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the trustees (or other persons who  administer  the employee  benefit plan) have
duly  caused this  annual  report to be signed on its behalf by the  undersigned
hereunto duly authorized.


                                        KENNECOTT CORPORATION SAVINGS PLAN
                                        FOR HOURLY EMPLOYEES



                                        By: /s/ Kay Priestly
                                           -------------------------------------
                                           Name:  Kay Priestly
                                           Title: Vice President of Human
                                                  Resources

Date: July 11, 2007


                                 Page 21 of 23



Exhibit        Description
-------        -----------

23.1           Consent of Tanner LC







                                 Page 22 of 23