; and (ii) held in trust by the United States for, or owned by, any Indian tribe or member of an Indian tribe, as defined in section 2 of the Indian Mineral Development Act of 1982 ( 25 U.S.C. 2101 ). (14) Mineral activity The term mineral activity means any activity on a mining claim, millsite, or tunnel site, or Federal land used in conjunction with the activity, for, relating to, or incidental to, mineral exploration, mining, beneficiation, processing, or reclamation activities for any locatable mineral. (15) National Conservation System Unit The term National Conservation System unit means— (A) any unit of— (i) the National Park System; (ii) the National Wildlife Refuge System; or (iii) the National Wild and Scenic Rivers System; (B) a National Monument; or (C) a National Conservation Area. (16) Operator The term operator means— (A) any person proposing, or authorized by a permit, to conduct mineral activities under this Act; and (B) any agent of a person described in subparagraph (A). (17) Person The term person means— (A) an individual, Indian tribe, partnership, association, society, joint venture, joint stock company, firm, company, corporation, cooperative, trust, consortium, or other organization; and (B) any instrumentality of a State or local government, including any publicly owned utility or publicly owned corporation of a State or local government. (18) Processing (A) In general The term processing means processes downstream of beneficiation used to prepare locatable mineral ore into the final marketable product. (B) Inclusions The term processing includes smelting and electrolytic refining. (19) Secretary The term Secretary means the Secretary of the Interior. (20) Secretary concerned The term Secretary concerned means— (A) the Secretary of Agriculture (acting through the Chief of the Forest Service), with respect to National Forest System land