A Study of the Visible Indications of Ore Value in the Metadiorite of the Mother Lode Area Near Jackson, California ... |
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Donald Kenneth Gill. ACKNOWLEDGMENTS The writer wishes to express his appreciation for the continued guidance and suggestions of Fro- fessor Charles A. Dobbel throughout this investigation . The generosity of the Le Roi Mines ...
Donald Kenneth Gill. ACKNOWLEDGMENTS The writer wishes to express his appreciation for the continued guidance and suggestions of Fro- fessor Charles A. Dobbel throughout this investigation . The generosity of the Le Roi Mines ...
Page 7
... continued after the deposition of th vein material . cross - faults appear to have experienced movement both before and after the ore deposition and the vein faulting . The north - south vein system is displaced by the east- west vein ...
... continued after the deposition of th vein material . cross - faults appear to have experienced movement both before and after the ore deposition and the vein faulting . The north - south vein system is displaced by the east- west vein ...
Page 38
... continued long . Calcite is generally late in occur- rence . Pyrite is followed by chalcopyrite , and cold is the last mineral to precipitate . The periods of precipitation of the various minerals , however , are not separated by defi ...
... continued long . Calcite is generally late in occur- rence . Pyrite is followed by chalcopyrite , and cold is the last mineral to precipitate . The periods of precipitation of the various minerals , however , are not separated by defi ...
Contents
Factors Contributing to This Study | 23 |
Inaccuracies in Study | 28 |
Negative Results of Study | 31 |
2 other sections not shown
Common terms and phrases
420 drift Distance 420 drift Position 450 Distance 65 degrees 7x natural 7x natural size abundant altered to talc assay Au per ton bands Calcite Calculated pyrite value Central belt chalcopyrite constituent of specimen country rock cross-faults crystalline crystallized pyrite crystals see Plate degree of crystallization diorite Distance above level East belt east-west vein Easyz Bird vein estimated degree euhedral fissures foot-wall side Fracturing free gold Fyrite geology gold content Gold Deposits gold value gouge hanging-wall side highly altered impregnation inches irregular and massive Lovel Magnification massive and irregular massive bull massive pyrite mesothermal meta metadiorite area mineral MOKELUMNE HILL north-south vein system numbers perfect cubical crystals polished sections Position in vein precipitation present principal constituent PY Qtz pyrite crystals pyrite cubes Pyrite percentage Q+z Py raise Distance region Replacement slightly fractured small amount small irregular masses speci tion transparent Valuc vugs wall-rock walls