Ahlness, Jon K.
Electronic ore sorting tests on native copper ore / by Jon K. Ahlness and James C. Kirchner. - [Washington, D.C.] : U.S. Dept. of the Interior, 1980. - ii, 36 p. : ill., 1 map. - Report of investigations / Bureau of Mines, U.S. Department of the Interior ; 8490 . - Report of investigations (U.S. Department of the Interior. 8490. .
80607071
Electronic ore sorters--Testing.
Copper--Metallurgy.
Copper ores--Michigan.
Electronic ore sorting tests on native copper ore / by Jon K. Ahlness and James C. Kirchner. - [Washington, D.C.] : U.S. Dept. of the Interior, 1980. - ii, 36 p. : ill., 1 map. - Report of investigations / Bureau of Mines, U.S. Department of the Interior ; 8490 . - Report of investigations (U.S. Department of the Interior. 8490. .
80607071
Electronic ore sorters--Testing.
Copper--Metallurgy.
Copper ores--Michigan.