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        <title>Cleveland-Cliffs Inc. Quarterly report pursuant to Section 13 or 15(d)</title>
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            <h3>Quarterly report pursuant to Section 13 or 15(d)</h3>
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                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/794">ACQUISITION OF AK STEEL (Notes)</a></li>
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                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/803">DERIVATIVE INSTRUMENTS (Notes)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/804">SHAREHOLDERS&#039; EQUITY (Notes)</a></li>
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                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/806">RELATED PARTIES (Notes)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/807">VARIABLE INTEREST ENTITIES (Notes)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/808">EARNINGS PER SHARE (Notes)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/809">COMMITMENTS AND CONTINGENCIES (Notes)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/810">SUBSEQUENT EVENTS (Notes)</a></li>
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                                <a class="menu-item " href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/811">Accounting Policies</a>
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                                <a class="menu-item " href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/812">Notes Tables</a>
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                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/814">ACQUISITION OF AK STEEL (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/815">SEGMENT REPORTING (Tables)</a></li>
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                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/820">PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/821">ASSET RETIREMENT OBLIGATIONS (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/822">DERIVATIVE INSTRUMENTS (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/823">SHAREHOLDERS&#039; EQUITY - Dividends Declared (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/824">ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/825">RELATED PARTIES (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/826">VARIABLE INTEREST ENTITIES (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/827">EARNINGS PER SHARE (Tables)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/828">COMMITMENTS AND CONTINGENCIES (Tables)</a></li>
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                                <a class="menu-item " href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/829">Notes Details</a>
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                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/829">BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Equity Method Investments (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/830">SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Revenues (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/831">SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Allowance for Credit Losses (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/832">SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Inventories (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/833">SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Deferred Revenue (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/834">SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Accrued Liabilities (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/835">SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Cash Flow Information (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/836">SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Non-Cash Investing and Financing Activities (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/837">ACQUISITION OF AK STEEL - Transaction Overview (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/838">ACQUISITION OF AK STEEL - Transaction Consideration (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/839">ACQUISITION OF AK STEEL - Assets and Liabilities Assumed (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/840">ACQUISITION OF AK STEEL - Intangible Assets and Liabilities (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/841">ACQUISITION OF AK STEEL - Pro Forma Information (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/842">SEGMENT REPORTING - Results by Segment (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/843">SEGMENT REPORTING - Net Income (Loss) to Total Adjusted EBITDA (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/844">SEGMENT REPORTING - Segment Assets (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/845">SEGMENT REPORTING - Segment Capital Additions (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/846">PROPERTY, PLANT AND EQUIPMENT (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/847">GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Goodwill (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/848">GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Intangible Assets and Liabilities (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/849">GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Amortization of Intangible Assets (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/850">GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Amortization of Intangible Liability (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/851">DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/852">DEBT AND CREDIT FACILITIES - Narrative (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/853">DEBT AND CREDIT FACILITIES - Debt Instrument Redemption (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/854">DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/855">DEBT AND CREDIT FACILITIES - ABL Facility (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/856">DEBT AND CREDIT FACILITIES - Schedule of Debt Maturities (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/857">FAIR VALUE MEASUREMENTS - Fair Value of Assets and Liabilities (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/858">FAIR VALUE MEASUREMENTS - Quantitative Inputs And Assumptions For Level 3 Assets And Liabilities (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/859">FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/860">FAIR VALUE MEASUREMENTS - Carrying Value And Fair Value Of Financial Instruments Disclosure (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/861">PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/862">INCOME TAXES - Narrative (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/863">ASSET RETIREMENT OBLIGATIONS - Summary Of Asset Retirement Obligations (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/864">ASSET RETIREMENT OBLIGATIONS - Asset Retirement Obligation Disclosure (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/865">DERIVATIVE INSTRUMENTS - Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/866">DERIVATIVE INSTRUMENTS - Schedule of Notional Amounts of Outstanding Derivatives (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/867">DERIVATIVE INSTRUMENTS - Estimated Losses in Future Periods (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/868">DERIVATIVE INSTRUMENTS - Schedule Of Derivatives Not Designated As Hedging Instruments (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/869">SHAREHOLDERS&#039; EQUITY - Narrative (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/870">SHAREHOLDERS&#039; EQUITY - Dividends Declared (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/871">ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in AOCI (loss) related to shareholders&#039; equity (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/872">ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income (Loss) Components (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/873">RELATED PARTIES - Summary Of Ownership Interests (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/874">RELATED PARTIES - Summary Of Related Party Transactions Table Disclosure (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/875">VARIABLE INTEREST ENTITIES (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/876">EARNINGS PER SHARE - Earnings Per Share Computation (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/877">EARNINGS PER SHARE - Antidilutive Securities (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/878">COMMITMENTS AND CONTINGENCIES - Purchase Commitments (Details)</a></li>
                                                                            <li><a href="/investors/sec-filings/all-sec-filings/xbrl_doc_only/879">COMMITMENTS AND CONTINGENCIES - Contingencies (Details)</a></li>
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                <h4>RELATED PARTIES (Notes)</h4>
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