A Study of the Visible Indications of Ore Value in the Metadiorite of the Mother Lode Area Near Jackson, California ... |
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... approximate value of ore exposed in a freshly broken face is made evident to many mining men by a cursory In the usual case , the appraiser can not tell why the ore observed is of such a value , but bases his es- timate simply upon ...
... approximate value of ore exposed in a freshly broken face is made evident to many mining men by a cursory In the usual case , the appraiser can not tell why the ore observed is of such a value , but bases his es- timate simply upon ...
Page 1
... approximate value of the pyrite - bear- ing rock becomes of great importance in the mine operations . An ore study of this area was carried out over the past eight months ( prior to March , 1939 ) , and it is to be concluded that : 1 ...
... approximate value of the pyrite - bear- ing rock becomes of great importance in the mine operations . An ore study of this area was carried out over the past eight months ( prior to March , 1939 ) , and it is to be concluded that : 1 ...
Page 23
... approximate value by inspection . The pyrite is the only logical factor which could give a key to the value of the ore of the region . For this reason , special emphasis has been placed upon the study of pyrite in the ore . The range of ...
... approximate value by inspection . The pyrite is the only logical factor which could give a key to the value of the ore of the region . For this reason , special emphasis has been placed upon the study of pyrite in the ore . The range of ...
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