Ahlness, Jon K. <br/><br/>
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. .
<br/><br/><label>LCCN: </label>80607071  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic ore sorters--Testing.<br/>Copper--Metallurgy.<br/>Copper ores--Michigan.