Mineral Exploration and Development Act of 1993 : hearing before the Subcommittee on Energy and Mineral Resources of the Committee on Natural Resources, House of Representatives, One Hundred Third Congress, first session, on H.R. 322, to modify the requirements applicable to locatable minerals on public domain lands, consistent with the principles of self-initiation of mining claims, and for other purposes, hearing held in Washington, DC, March 11, 1993.