ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | NOTE 1 — ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Nature of Operations: Mines Management, Inc. (the Company) is an Idaho corporation incorporated in 1947. The Company acquires, explores, and develops mineral properties in North America. The Company’s principal mineral property interest, the Montanore Project, is held by its wholly owned subsidiaries, Newhi Inc. and Montanore Minerals Corp. The Company’s properties, including the Montanore property, are currently in the exploration stage; none of its properties are currently in production. The Company continues acquiring various permits for the Montanore Project and is determining its feasibility for development. The Company’s business, operations and financial condition are subject to significant risks and uncertainties, including failing to secure additional funding to continue its business and execute its planned advanced evaluation and delineation drilling program at the Montanore Project. Summary of Significant Accounting Policies: These unaudited interim financial statements have been prepared by the Company in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information, as well as the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. In the opinion of the Company’s management, all adjustments (consisting solely of normal recurring adjustments) considered necessary for a fair presentation of the interim financial statements have been included. The preparation of financial statements in accordance with U.S. GAAP requires the use of estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities known to exist as of the date the financial statements are published, and the reported amounts of revenues and expenses during the reporting period. Uncertainties with respect to such estimates and assumptions are inherent in the preparation of the Company’s condensed consolidated financial statements; accordingly, it is possible that the actual results could differ from these estimates and assumptions, which could have a material effect on the reported amounts of the Company’s consolidated financial position and results of operations. Operating results for the six month period ended June 30, 2016 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2016. For further information, refer to the consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. (a) Going concern T he accompanying condensed consolidated financial statements have been prepared under the assumption that the Company will continue as a going concern and do not include any adjustments that might be necessary should the Company be unable to continue as a going concern. The Company is an exploration stage company and has incurred losses since the inception of its exploration stage. The Company does not have a recurring source of revenue or sufficient cash to fund normal operations or meet its debt obligations without raising additional funds. These factors raise substantial doubt about the Company’s ability to continue as a going concern. On May 23, 2016, the Company entered into an agreement and plan of merger with Hecla Mining Company as further described in Note 6. If the proposed merger is not completed, the Company will need to seek additional capital or consider other alternatives, which could include bankruptcy or the sale of some or all of its assets. (b) Mining properties, exploration and development costs All exploration expenditures are expensed as incurred. Significant property acquisition payments for active exploration properties are capitalized, including payments to acquire mineral rights. Once a feasibility study has been completed and approved by management, and a decision is made to put the ore body into production, expenditures to develop new mines, to define further mineralization in existing ore bodies, and to expand the capacity of operating mines, are capitalized and amortized on the units of production basis over proven and probable reserves. The Company charges to operations the allocable portion of capitalized costs attributable to properties sold. Capitalized costs are allocated to properties sold based on the proportion of claims sold to the claims remaining within the project area. (c) Fair value measurements The Company discloses the inputs used to develop the fair value measurements for the Company’s financial assets and liabilities that are measured at fair value on a recurring basis as well as the level within the fair value hierarchy in which the fair value measurements in their entirety fall. The three levels of the fair value hierarchy are as follows: Level 1: Unadjusted quoted market prices in active markets for identical assets or liabilities that are accessible at the measurement date. Level 2: Quoted prices in inactive markets for identical assets or liabilities, quoted prices for similar assets or liabilities in active markets, or other observable inputs either directly related to the asset or liability or derived principally from corroborated observable market data. Level 3: Unobservable inputs due to the fact that there is little or no market activity. (d) Stock compensation The Company measures and records the costs of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award, recognized over the period during which an employee is required to provide services in exchange for such award. Compensation cost is recognized for awards granted and for awards modified, repurchased or cancelled. (e) Net loss per share Basic earnings or loss per share is computed on the basis of the weighted average number of shares outstanding during the period. Diluted earnings or loss per share is calculated on the basis of the weighted average number of shares outstanding during the period plus the effect of potential dilutive shares during the period. Potential dilutive shares include outstanding stock options and warrants. For periods in which a net loss is reported, potential dilutive shares are excluded because they are antidilutive. Therefore, basic loss per share is the same as diluted loss per share for the periods ended June 30, 2016 and 2015. (f) Recent Accounting Pronouncements In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, which defines management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern and to provide related footnote disclosures. This guidance is effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Adoption of this update is expected to affect only the presentation and disclosures of the Company’s consolidated financial statements. I n February 2016, the FASB issued a new standard, Leases (ASC 842). Under the new guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than twelve months and to disclose key information about leasing arrangements. This guidance is effective for fiscal years beginning after December 15, 2018. The Company is not able to reasonably estimate the impact on the Company's consolidated financial statements at this time. In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation: Improvements to Employee Share-Based Payment Accounting , which is intended to simplify several areas of accounting for share-based compensation arrangements, including the income tax impact, classification on the statement of cash flows, and forfeitures. This guidance is effective for years ending after December 31, 2016. The Company is currently assessing the impact, if any, on its consolidated financial statements. |