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, Bureau of Mines,  1980. 
 - ii, 36 p. :  ill., 1 map ;  27 cm. 
 - Report of investigations ;  8490 .
 - Report of investigations (United States. Bureau of Mines) ;  8490. .
<br/><br/>Bibliography: p. 34-35. 
<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.
<br/><br/><label>LC Class. No.: </label>TN23  TN515  / .U43 no. 8490 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.343 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.23