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Placer Gold Recovery Methods By Michael Silva Special Publication 87
Placer Gold Recovery Methods By Michael Silva Special Publication 87
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Placer Gold Recovery Methods By Michael Silva, Special Publication
1986
California Department of Conservation
Division of Mines and Geology
1416 Ninth Street
Sacramento, California 95814
Contents
Introduction.......................................................................................................Pg. 1
Concentration of Placer Gold Ore.....................................................................Pg. 2
Small Scale Recovery Equipment.....................................................................Pg. 2
Gold Pan.........................................................................................................Pg. 2
Rocker............................................................................................................Pg. 3
Construction.............................................................................................Pg. 3
Assembly..................................................................................................Pg. 5
Operation..................................................................................................Pg. 5
Sluices............................................................................................................Pg. 6
Long Tom.................................................................................................Pg. 7
Dip-Box....................................................................................................Pg. 8
Shaking Tables...............................................................................................Pg. 8
Portable Processing Equipment......................................................................Pg. 9
Amalgamation................................................................................................Pg. 10
Dry Placers........................................................................................................Pg. 10
Dry Washers...................................................................................................Pg. 10
Air Tables (Oliver Gravity Separator) ..........................................................Pg. 11
Modern Recovery Equipment...........................................................................Pg. 12
Pinched Sluice Systems (Reichert Cone) ......................................................Pg. 12
Spiral Concentrators ......................................................................................Pg. 13
Rotating Spirals........................................................................................Pg. 15
Helixes.....................................................................................................Pg. 15
Jigs.................................................................................................................Pg. 16
Fine Material Separators................................................................................Pg. 20
Bartles-Mozley Separator........................................................................Pg. 20
Bartles CrossBelt Separator.....................................................................Pg. 21
Centrifugal Concentrators..............................................................................Pg. 21
Bowls.......................................................................................................Pg. 21
Knelson Concentrator..............................................................................Pg. 22
Summary...........................................................................................................Pg. 22
Operating Mines...............................................................................................Pg. 23
Hammonton Dredge......................................................................................Pg. 23
Hansen Brothers - Hugh Fisher.....................................................................Pg. 25
Bear River...............................................................................................Pg. 26
Greenhorn Creek.....................................................................................Pg. 26
TRI-R Engineering - Stinson Mine...............................................................Pg. 27
Selected Annotated References........................................................................Pg. 29
Appendix: List of Equipment Manufacturers and Suppliers...........................Pg. 31
Materials
Materials
Dimensions
Dimensions
Care information
Care information








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