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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