SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

Commission file number 1-1143

Inco Limited

(Name of Registrant as specified in its charter)

145 King Street West, Suite 1500, Toronto, Ontario M5H 4B7*

(Address of principal executive offices, including zip code)

(416) 361-7511

(Telephone number)

     The Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 (the “Act”) during the preceding twelve months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

      The Registrant is an accelerated filer (as defined in Rule 12b-2 under the Act).

      Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes o          No þ

      Unless otherwise stated, dollar amounts in this Report are expressed in United States currency.

      Common Shares outstanding at September 30, 2005: 189,485,940 shares, no par value.

      * Notices and communications from the Securities and Exchange Commission may be sent to S.F. Feiner, Executive Vice-President, General Counsel and Secretary, 145 King Street West, Suite 1500, Toronto, Ontario M5H 4B7. His telephone number is (416) 361-7680.

TABLE OF CONTENTS

PART I — FINANCIAL INFORMATION

INCO LIMITED AND SUBSIDIARIES

Consolidated Statement of Earnings

(Unaudited)

See Notes to Consolidated Financial Statements.

INCO LIMITED AND SUBSIDIARIES

Consolidated Statement of Retained Earnings (Deficit)

(Unaudited)

See Notes to Consolidated Financial Statements.

INCO LIMITED AND SUBSIDIARIES

Consolidated Balance Sheet

(Unaudited)

See Notes to Consolidated Financial Statements.

INCO LIMITED AND SUBSIDIARIES

Consolidated Statement of Cash Flows

(Unaudited)

See Notes to Consolidated Financial Statements.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements

(Unaudited)

(Tabular amounts in millions of United States dollars except number of shares and per share amounts)

      The unaudited consolidated financial statements presented herein have been prepared in accordance with generally accepted accounting principles (GAAP) in Canada (see Note 18 for significant differences between Canadian GAAP and United States GAAP) for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, all adjustments considered necessary for a fair presentation of results for the periods reported have been included. These adjustments consist only of normal recurring adjustments. Results of operations for the three-month and nine-month periods ended September 30, 2005 are not necessarily indicative of the results that may be expected for the year ending December 31, 2005 or any other interim period. These interim consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2004.

      Effective January 1, 2005, on a retroactive basis, we adopted revisions to Canadian Institute of Chartered Accountants (CICA) Section 3860, Financial Instruments — Disclosure and Presentation. The revisions relate to the accounting for instruments for which the issuer has the right to settle in cash or its own shares. Such an instrument is bifurcated between debt and equity in accordance with this revised standard. This change impacted the accounting treatment for our LYON notes, Convertible Debentures due 2023 (“Convertible Debentures”) and 3¹/2% Subordinated Convertible Debentures due 2052 (“Subordinated Debentures”) which were previously treated as equity in accordance with EIC-71, Financial Instruments that may be Settled at the Issuer’s Option in Cash or its own Equity Instruments. Consistent with this change, we record interest expense in lieu of accretion charges with respect to these convertible debt securities. The impact on our balance sheet as at December 31, 2004 was an increase in long-term debt of $210 million, an increase in deferred income and mining taxes of $11 million, a decrease in convertible debt classified as equity of $201 million, an increase in deferred charges of $7 million and a reduction in retained earnings of $13 million. In addition, as the revisions resulted in the retroactive restatement of our interest expense, there was an increase in the amount of interest capitalized in respect of our development projects. The impact in respect of the adjustment to capitalized interest was an increase in property, plant and equipment of $7 million; an increase in deferred income and mining taxes of $1 million and an increase in retained earnings of $6 million.

      The bifurcation was determined by calculating the fair value of debt and assigning the excess to equity. The excess relates to the value of the conversion feature and put options applicable to the particular convertible debt security. The fair value determination assumes that the particular convertible debt security will mature and be payable in accordance with its applicable maturity date or the end of its stated term, which term ends, in the case of our LYON notes, in March 2021, in March 2023 in the case of our Convertible Debentures, and in March 2052 for our Subordinated Debentures. During October 2005, the Emerging Issues Committee (EIC) of the CICA issued EIC No. 158, Accounting for Convertible Debt Instruments. EIC No. 158 requires convertible debt to be valued as if it matured on the first date that holders are permitted to put the securities. However, as EIC No. 158 is required to be applied to convertible debt instruments issued after October 17, 2005, there will be no change to the methodology under which we have bifurcated our convertible debt between debt and equity as described above.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      During the third quarter of 2005 the EIC issued EIC No. 155, The Effects of Contingently Convertible Instruments on the Computation of Diluted Earnings per Share. The new abstract, which is effective for interim and annual periods beginning after October 1, 2005, requires that the effects of contingently convertible instruments be included in the computation of diluted earnings per share regardless of whether the market price trigger has been met. We early adopted this abstract on September 30, 2005 on a retroactive basis. There was no impact of adoption on 2005 third quarter and first nine months earnings per share as the market price triggers on our contingently convertible debt were met for these periods and thus the contingently convertible instruments were already included in the computation of diluted earnings per share. The impact on 2004 third quarter and first nine months earnings per share was a reduction of two cents and seven cents, respectively.

      In January 2005, the CICA issued three new standards relating to financial instruments. These standards are as follows:

      This standard prescribes when a financial asset, financial liability, or non-financial derivative is to be recognized on the balance sheet and at what amount — sometimes using fair value; other times using cost-based measures. It also specifies how financial instrument gains and losses are to be presented.

      This standard is applicable whenever a company chooses to designate a hedging relationship for accounting purposes. It builds on Accounting Guideline No. 13 — Hedging Relationships, and Section 1650 — Foreign Currency Translation, by specifying how hedge accounting is applied and what disclosures are necessary when it is applied.

      This standard introduces new rules for the reporting and display of comprehensive income. Comprehensive income, which we currently report for United States GAAP, is the change in equity (net assets) of an enterprise during a reporting period from transactions and other events and circumstances from non-owner sources. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners.

      These standards are applicable for fiscal years beginning on or after October 1, 2006. If a company elects to early adopt such standards the early adoption election must be applied to all three standards at the same time. We are currently reviewing the impact of these new standards.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      Other income, net is comprised of the following:

      During the second quarter of 2005, we announced that we had entered into a long-term agreement with Falconbridge Limited under which we would sell all of our copper production from our Ontario operations in anode form to them beginning in 2006. In connection with this decision, a pre-tax impairment charge of $25 million was recorded which primarily relates to a reduction in the carrying value of our copper refining facility in Sudbury, Ontario since this facility will be closed by the end of 2005.

      During the second quarter of 2004, we announced the preliminary findings reached to that date as part of the second phase, or Phase 2, of the comprehensive review of our then approximately 85 per cent-owned Goro nickel-cobalt project in New Caledonia. We also announced that the principal changes in the planned Goro project configuration resulting from such findings as part of Phase 2 of our review, moving from indirect to direct heating of ore feed and other changes intended to reduce the capital cost estimate and enhance the operating efficiency of the planned process plant and the process itself, would result in certain assets being written off in the second quarter of 2004. Following our review of the affected assets, we recorded a non-cash pre-tax charge of $201 million in the second quarter of 2004. The affected assets were primarily comprised of engineering and related work associated with the original project configuration and equipment purchased for the indirect heating of ore feed which no longer had future benefit to the Goro project or otherwise.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      The reconciliation between taxes at the combined federal-provincial statutory income tax rate in Canada and the effective income and mining tax rates was as follows:

      Employer contributions in respect of our defined benefit plans during the third quarter and first nine months of 2005 were $44 million (2004: $42 million) and $129 million (2004: $117 million), respectively. For the year ending December 31, 2005, we currently expect that such employer contributions, including voluntary contributions, will amount to at least approximately $170 million.

      Post-retirement benefits expense included the following components:

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      The following table shows the movement in the long-term liability for our asset retirement obligation:

      We are authorized to issue an unlimited number of Common Shares without nominal or par value. Changes in Common Shares were as follows:

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      The computation of basic and diluted earnings per share was as follows:

      On May 28, 2004, we concluded a new $750 million syndicated revolving credit facility with a maturity date of May 28, 2009. This syndicated facility replaced several bilateral bank credit agreements under which we had an aggregate of $680 million of available credit as of year-end 2003, where $273 million of such $680 million would have otherwise expired on June 1, 2004 and the balance in either June 2005, June 2006 or June 2007. Subject to the approval of the lenders representing not less than 66²/3 per cent in total commitments under this new syndicated facility, the maturity date of the syndicated revolving credit facility may be extended for the commitments of those lenders who have approved such extension for an additional one-year period on each May 28 anniversary date, beginning May 28, 2005. Effective May 28, 2005, the lenders under the $750 million syndicated revolving credit facility agreed to extend the maturity date of the facility from May 28, 2009 by an additional year to May 28, 2010.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      The borrowings under the facility may be made in either Canadian dollars in the form of (a) Prime Rate loans (as defined under the credit facility) or (b) in Bankers’ Acceptances (as defined under the credit facility) or in United States dollars in the form of (i) United States Base Rate loans (as defined under the credit facility) or (ii) London Interbank Offered Rate (LIBOR) loans (as defined under the credit facility). Borrowings under these facilities bear interest, when drawn, at a rate which varies based on the type of borrowing and our credit ratings at the time of borrowing. As of September 30, 2005, there were no amounts drawn under the facility.

      This syndicated credit facility provides that, so long as advances are outstanding or any letters of credit or guarantees issued pursuant to the terms of the facility are outstanding, we will be required to maintain a ratio of Consolidated Indebtedness, as defined in the credit facility, to Tangible Net Worth, as defined in the credit facility, not to exceed 50:50. At September 30, 2005 the ratio of Consolidated Indebtedness to Tangible Net Worth was 24:76. The syndicated facility does not require any acceleration or prepayment of outstanding balances if our credit ratings on outstanding debt securities were downgraded or if there were a significant decline in our earnings, cash flow or in the price of our publicly traded common shares or other equity securities. A downgrade in our rating would, however, increase the interest rate payable on borrowings under the facility and, conversely, any upgrade in our rating would reduce the interest rate payable on borrowings. As of September 30, 2005, our outstanding debt securities were rated as investment grade by Moody’s Investors Service and Standard & Poor’s Ratings Services, with the specific ratings being Baa3 (stable outlook) by Moody’s Investors Service and BBB- (positive outlook) by Standard & Poor’s. After the announcement of our offer to purchase all of the common shares of Falconbridge Limited on October 11, 2005, as referred to in note 19 below, Standard & Poor’s Rating Services placed our rating on credit watch with negative implications while Moody’s affirmed our Baa3 rating (with a stable outlook). In connection with this offer, we have arranged commitments covering the debt financing sufficient to fund the cash portion (approximately $2.4 billion) of the offer we have made. We are currently negotiating the definitive loan agreements covering this financing.

      During the second quarter of 2005, we terminated our interest rates swaps in respect of our 7.75% Notes due 2012 and our 5.70% Debentures due 2015. The termination of these swaps resulted in payments to us totalling approximately $23 million which is included in cash from financing activities on our consolidated statement of cash flows for the nine months ended September 30, 2005 under “Financing activities — Other”. For accounting purposes, the gain realized from the termination of these swaps will be amortized over the respective remaining terms of the related debt instruments.

      As discussed in Note 2, we have changed our accounting for our convertible debt securities and have bifurcated these instruments between debt and equity. The assumption used in the fair value determination of debt was that each instrument would remain outstanding until its specific maturity date or the end of its stated term had been reached. During October 2005, the EIC issued EIC No. 158, Accounting for Convertible Debt Instruments. EIC No. 158 requires convertible debt to be valued as if it matured on the first date that holders are permitted to put the securities. However, as EIC No. 158 is required to be applied to convertible debt

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

instruments issued after October 17, 2005, there will be no change to the methodology under which we have bifurcated our convertible debt between debt and equity as described above.

      During the third quarter of 2005, LYON notes representing approximately, $57 million aggregate principal amount were tendered for conversion. The Company, at its option, elected to settle its obligations in respect of these notes in accordance with their terms for cash in lieu of shares in the amount of $65 million. The difference between the $65 million and the book value of $35 million represents a charge of $30 million. For accounting purposes, the LYON notes are bifurcated between debt and equity, the equity portion representing the value of the holders’ conversion options. Consequently, the charge of $30 million has been bifurcated between earnings and a direct charge to retained earnings. The split is a charge to earnings of $8 million and a charge to retained earnings of $22 million.

      Changes in warrants were as follows:

      The following table summarizes as of September 30, 2005 certain of our long-term contractual obligations and commercial commitments for each of the next five years and thereafter:

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      In the course of our operations, we and our subsidiaries are subject to routine claims and litigation incidental to the business conducted by us and them, to various environmental proceedings, and to other litigation related to these businesses. With respect to the environmental proceedings currently pending or threatened against us, they include (1) a proceeding brought under the Ontario class action legislation covering claims relating to the alleged decline in property values in a community where we had operated a nickel refinery over the 1918-1984 period, (2) claims for personal injury, (3) enforcement actions, (4) alleged violations of, including exceeding regulatory limits relating to discharges under, certain environmental or similar laws and regulations applicable to our operations in Canada and elsewhere and (5) certain claims dating back a number of years in which one of our subsidiaries was designated, under the United States federal environmental law known as “Superfund” or “CERCLA”, as a potentially responsible party. We believe that the ultimate resolution of such proceedings, claims and litigation will not significantly impair our operations or have a material adverse effect on our financial condition or results of operations.

      In December 2004, we entered into agreements for the Goro project covering the Girardin Act tax-advantaged lease financing program (“Girardin Financing”) sponsored by the French Government. The Girardin Financing is subject to a ruling issued by the French Minister of Economy, Finance and Industry (the “Ruling”). The Ruling provides that certain investors who are French qualified investors under the Girardin Financing (the “Tax Investors”) may utilize certain tax deductions in connection with assets representing a portion of the Goro project’s processing plant which are financed by the Girardin Financing. The Ruling requires that Goro Nickel and Inco Limited satisfy certain conditions, including operating the Goro project for a minimum of five years. In 2004, the Tax Investors had provided $41 million in tax advances which were recorded on our balance sheet as a deferred credit since these advances represent government assistance in the form of a forgivable loan. We have transferred a portion of this forgivable loan from a deferred credit to offset property, plant and equipment in the amount of $27 million, such amount representing a pro-rata portion of the amount spent to date in respect of the approved assets under the arrangement.

      We are a leading producer of nickel and an important producer of copper, precious metals and cobalt. Our operations consist of the finished products segment, which comprises the mining and processing operations in Ontario and Manitoba, Canada, and refining operations in the United Kingdom and interests in refining operations in Japan and other Asian countries, and the intermediates segment, which comprises the mining and processing operations in Indonesia, where nickel-in-matte, an intermediate product, is produced and sold primarily into the Japanese market. In addition, we hold mineral claims and licenses for development projects which include our Voisey’s Bay nickel-copper-cobalt project under development in the Province of Newfoundland and Labrador and our Goro nickel-cobalt project in the French overseas territorial community (collectivité territoriale) of New Caledonia.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      Data by operating segments as of and for the periods indicated was as follows:

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      The following represents certain supplemental information in connection with our Consolidated Balance Sheet:

      Capitalized interest costs included in capital expenditures were $80 million in the first nine months of 2005 (2004: $47 million).

      For the three months and nine months ended September 30, 2005, an expense of $3 million (2004: $2 million) and $10 million (2004: $9 million), respectively, was charged to earnings with an equivalent offset credited to contributed surplus to reflect the vested portion of the fair value of stock options granted to employees in 2004 and 2005. For the first nine months of 2005, a transfer of $3 million (2004: $1 million) was made from contributed surplus to common shares in respect of exercised options. The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      (a) For the first nine months of 2005, minority interest included a recovery in Goro Nickel of $25 million, reflecting the recovery of losses previously taken by us due to insufficient minority interest balances existing in 2004 to absorb the share by the minority interest of the previously announced impairment charge associated with the Goro project recorded in the second quarter of 2004.

      (b) On February 18, 2005, a company formed by the three provinces of New Caledonia, Société de Participation Minière du Sud Calédonien S.A.S. (“SPMSC”), acquired all of the shares of Goro Nickel, the project company for our Goro project, then held by a subsidiary of a French government agency, Bureau des Recherches Géologiques et Minières. These shares represented, after the capitalization by Goro Nickel of certain shareholder advances as of February 18, 2005, approximately a 9.71 per cent ownership interest in Goro Nickel. At the same time, we sold shares in Goro Nickel to SPMSC representing approximately a 0.29 per cent interest such that SPMSC would own, as of February 18, 2005, approximately a 10 per cent ownership interest in Goro Nickel. SPMSC also entered into a shareholders agreement (the “SPMSC Shareholders Agreement”) with us on February 18, 2005 setting forth its rights and obligations as a shareholder in Goro Nickel. Under the SPMSC Shareholders Agreement, SPMSC has the right, but not the obligation, to make capital contributions on a pro rata basis as required to meet the funding requirements of Goro Nickel until such time as the Goro project meets certain minimum commercial production and related performance tests (the “SPMSC Threshold Performance Tests”). If SPMSC does not make such capital contributions, then Inco has agreed to provide such capital contributions in addition to its own pro rata contributions, subject to certain limitations, and SPMSC would, accordingly, suffer dilution of its ownership interest, with the dilution formula to be subject to a penalty if SPMSC’s interest by virtue of dilution were to fall below five per cent. Once the SPMSC Threshold Performance Tests are met, to the extent that SPMSC has elected not to make its pro rata capital contributions and, accordingly, has suffered dilution of its interest in Goro Nickel, SPMSC has under the SPMSC Shareholders Agreement agreed to purchase from Inco, based upon the price paid by Inco for such shares plus interest thereon based upon a formula tied to Inco’s then applicable long-term weighted average cost of capital, a sufficient number of shares such that SPMSC will then hold a 10 per cent ownership interest in Goro Nickel. SPMSC has through the end of the third quarter of 2005 elected not to make any such pro rata capital contributions as and when required by Goro Nickel.

      On April 8, 2005 Sumitomo Metal Mining Co., Ltd. (“Sumitomo Metal Mining”) and Mitsui & Co., Ltd. (“Mitsui”), through a jointly owned company they formed, Sumic Nickel Netherlands B.V. (“Sumic Nickel”), acquired a 21 per cent ownership interest in Goro Nickel. Under the terms of a share purchase agreement entered into with us covering this transaction, Sumitomo Metal Mining and Mitsui paid to us in total approximately $150 million for the 21 per cent interest. This amount included their pro rata share of certain project capital and other expenditures made since we announced our initial decision in July 2001 to proceed with the Goro project and certain advances made by us to fund the project. Under the terms of a shareholders agreement entered into as of April 8, 2005 (the “Sumic Shareholders Agreement”), setting forth the rights and obligations Sumic Nickel (and Sumitomo Metal Mining and Mitsui) would have as a shareholder in Goro Nickel, including the right to elect two directors to the board of directors of Goro Nickel so long as Sumic Nickel holds at least a 16 per cent ownership interest in Goro Nickel and the right to elect one director so long as it holds at least an 8 per cent ownership interest, Sumic Nickel is also obligated to make capital contributions on a pro rata basis, subject to certain limitations and adjustments tied to the actual capital cost of the project, as required to meet the funding requirements of Goro Nickel until such time as the Goro project meets certain minimum commercial production and related performance tests (the “Sumic Threshold Performance Tests”). If Sumic Nickel does not make such capital contributions, it will suffer dilution of its ownership interest based upon a penalty dilution formula. If the capital cost of the Goro project exceeds a threshold above the current capital cost estimate prior to when the Sumic Threshold Performance Tests are met, then Sumic Nickel will not have any obligation to provide capital contributions to meet the

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

Goro project’s funding requirements and we would, subject to certain terms and conditions under the Sumic Shareholders Agreement, be required to provide certain funding to meet such requirements, up to a specified level, in the form of interest-bearing debt repayable by Goro Nickel. In addition, under the Sumic Shareholders Agreement Sumic Nickel has the right to participate on a pro rata basis in any future expansion of the Goro project and also has certain rights to approve certain expenditures and other actions relating to Goro Nickel or the Goro project that would be outside the currently planned scope and operation of the project. As of April 8, 2005, we, Sumic Nickel, Sumitomo Metal Mining and Mitsui also entered into an operations agreement which sets forth Goro Nickel’s role and responsibilities as the operator of the Goro project and its financial and other reporting obligations to its shareholders and a product offtake agreement was also executed under which Sumic Nickel has the right and obligation to purchase its pro rata share of Goro’s production of nickel product and cobalt product based on its ownership interest in Goro Nickel, with a subsidiary of ours under a separate product offtake agreement having the right and obligation to purchase all of Goro Nickel’s production not purchased by Sumic Nickel (which would currently represent 79 per cent of such eventual production).

      The transaction with Sumitomo Metal Mining, Mitsui and Sumic Nickel, which had no significant effect on our net earnings for the first nine months of 2005, was substantially completed as of March 31, 2005 and, accordingly, the sale of 21 per cent of Goro Nickel was recorded in the period ended March 31, 2005. At September 30, 2005, as a result of SPMSC’s election not to make any pro rata capital contributions, the shares of Goro Nickel were held approximately 70 per cent by Inco Limited, 21 per cent by Sumic Nickel and approximately 9 per cent by SPMSC.

      During the first nine months of 2005, we entered into put option contracts, giving us the right but not the obligation, to sell 145,476 tonnes of copper at an average price of $2,279 per tonne at various dates over the 2006 to 2008 period, and sold call option contracts, giving the buyer the right, but not the obligation, to purchase 126,876 tonnes of copper at an average price of $2,969 per tonne during the same time period.

      Our consolidated financial statements are prepared in accordance with Canadian GAAP. The differences between Canadian GAAP and United States GAAP, insofar as they affect our consolidated financial statements, are discussed below.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      The following table reconciles results as reported under Canadian GAAP with those that would have been reported under United States GAAP:

      For Canadian GAAP reporting purposes, we amortize the excess of the net unrecognized actuarial and investment gains and losses, if such gain or loss is over 10 per cent, of the greater of (i) the post-retirement benefits obligation and (ii) the fair value of plan assets. Such excess is amortized over the expected average remaining service life of employees. For United States reporting purposes, we amortize net unrecognized actuarial and investment gains and losses on a straight-line basis over the expected average remaining service life of employees.

      United States GAAP requires the recognition of a minimum additional pension liability in the amount of the excess of the unfunded accumulated benefits obligation over the recorded pension benefits liability and an offsetting intangible pension asset is recorded equal to the unrecognized prior service costs, with any net difference recorded as a reduction in accumulated other comprehensive income.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      Under Canadian GAAP, development costs are deferred and amortized if the development project meets certain generally accepted criteria for deferral and amortization. Fixed assets, including equipment, may be acquired or constructed in order to provide facilities for a research and development project. The use of such assets will extend over a number of accounting periods and, accordingly, such costs are capitalized and amortized over their useful lives. Under United States GAAP, research and development costs are charged to expense in the period incurred.

      Under Canadian GAAP, capitalized exploration expenditures are classified under property, plant and equipment with the related mineral claim. For United States GAAP, exploration expenditures are not capitalized unless estimated proven and probable ore reserves to which they relate have been established by a feasibility study.

      Under Canadian GAAP, our convertible debt securities are bifurcated between debt and equity. Under United States GAAP, our convertible debt securities are accounted for as debt. During the third quarter of 2005, as described in Note 10, certain LYON noteholders tendered for conversion their LYON notes. The Company, at its option, elected to settle the conversion of these notes for cash in lieu of shares which amounted to $65 million. The difference between the $65 million and the book value of $35 million represents a charge of $30 million. Under Canadian GAAP, the LYON notes are bifurcated between debt and equity, the equity portion representing the value of the holder conversion options. Consequently, under Canadian GAAP, the charge of $30 million has been bifurcated between a direct charge to earnings of $8 million and a direct charge to retained earnings of $22 million. Under United States GAAP, the entire $30 million loss is a charge to net earnings.

      Under United States GAAP, all derivative contracts, whether designated as effective hedging relationships or not, are required to be recorded on the balance sheet at fair value. Under Canadian GAAP, we continue to recognize gains and losses on derivative contracts in income concurrently with the recognition of the transactions being hedged. Under United States GAAP, if a portion of a derivative contract is excluded for purposes of effectiveness testing, such as time value, the value of such excluded portion is included in earnings. Under Canadian GAAP, the excluded portion is not included in earnings if the derivative contract is otherwise determined to be effective. The requirements for documentation and effectiveness testing, however, are substantially the same under both Canadian and United States GAAP.

      For United States GAAP reporting purposes, unrealized non-cash currency translation gains and losses arising from the translation into United States dollars, at the end of each period, of certain Canadian dollar-denominated deferred income and mining tax liabilities established in 1996 upon the acquisition of the Voisey’s Bay deposits are included in the determination of earnings. For Canadian GAAP reporting purposes, these unrealized non-cash currency translation gains and losses have been deferred and included in property, plant and equipment as part of development costs for the Voisey’s Bay project until operations commence.

INCO LIMITED AND SUBSIDIARIES

Notes to Consolidated Financial Statements — (Continued)

      Net earnings for the first nine months of 2004 under Canadian GAAP included an asset impairment charge in the amount of $201 million before income and mining taxes and minority interest. Reference is made to Note 4 above. This charge included the write-off of certain capitalized costs which, in accordance with (b) above, were previously expensed for United States GAAP purposes. In addition, it included an adjustment to reduce minority interest to nil. For United States GAAP, the asset impairment charge would decrease by $11 million. The adjustment to reduce minority interest to nil would also be adjusted with a corresponding increase to minority interest expense of $7 million.

      United States GAAP for equity investments, which are set forth in SFAS No. 115, require that certain equity investments not held for trading be recorded at fair value with unrealized holding gains and losses excluded from the determination of earnings and reported as a separate component of other comprehensive income.

      United States accounting standards for reporting comprehensive income are set forth in SFAS No. 130. Comprehensive income represents the change in equity during a reporting period from transactions and other events and circumstances from non-owner sources. Components of comprehensive income include items such as net earnings (loss), changes in the fair value of investments not held for trading, minimum pension liability adjustments and gains and losses on derivative instruments. For Canadian GAAP reporting purposes, there is currently no requirement to record other comprehensive income. Reference is made to Note 2 above.

      Changes in deficit and accumulated other comprehensive loss under United States GAAP were as follows: