Recovery of Byproduct Heavy Minerals from Sand and Gravel Operations in Central and Southern California.
Gomes-JM; Martinez-GM; Wong-MM
Proc Mineral Resource Potential of California Conf Sacramento 1980 Mar; :54-70
The federal Bureau of Mines has investigated the occurrence and recovery of byproduct heavy minerals from sand and gravel operations as a means of assessing the nation's resources. Sand samples from 63 locations in central and southern California were treated to yield heavy mineral concentrations. The mineral compositions of the concentrates were characterized by chemical and mineralogical examinations. Additional large quantities of concentrates were prepared from selected deposits that contained significant quantities of heavy minerals. Beneficiation studies were performed on these concentrates to recover individual mineral products. Gold was recovered by amalgamation; platinum-group metals and radioactive minerals were recovered by flotation; and magnetite, ilmenite, and chromite were recovered by magnetic and high-tension separation techniques.
Proc. Mineral Resource Potential of California Conf., Sacramento, Mar. 27-28, 1980, PP. 54-70