MINES AND GEOLOGY GORDON K. VAN VLECK, Secretary THE RESOURCES AGENCY GEORGE DEUKMEJIAN, Governor STATE OF CALIFORNIA DON L. BLUBAUGH, Director DEPARTMENT OF CONSERVATION PLACER GOLD RECOVERY METHODS

Would you like to read about sluices, shaker tables, retorts, and trommels, and more? Here is a PDF with information from special publication 87 of the 1986 CALIFORNIA DEPARTMENT OF CONSERVATION DIVISION OF MINES AND GEOLOGY by By Michael Silva. http://www.consrv.ca.gov/cgs/geologic_resources/gold/Documents/SP87.pdf  This was originally a 31 page PDF chock full of interesting information. Included are 21 black and white photos. The diagrams are good, the concepts are even better. FYI.