Recovering Byproduct Heavy Minerals from Sand and Gravel Operations in Northern California.
Gomes-JM; Martinez-GM; Wong-MM
Proc Aggregate Sand and Gravel Conf Reno Nev 1979 May; :4-33
The Bureau of Mines, as part of an effort to maximize minerals and metals recovery from domestic resources, has investigated sand and gravel, placer gold, and industrial mineral operations in northern California. Sand samples from about 50 locations were treated by gravity separation to yield heavy mineral concentrates (black sands). Mineral compositions of the concentrates were determined by chemical analysis and mineralogical examination. Individual zircon, ilmenite, magnetite, platinum-group metals, thoria, and silica products were prepared from heavy mineral concentrates by selective separation using low- and high-intensity magnetic, high-tension, and flotation equipment.
Proc. Aggregate, Sand and Gravel Conf., Reno, Nevada, May 5-9, 1979, PP. 4-33