A Study of the Visible Indications of Ore Value in the Metadiorite of the Mother Lode Area Near Jackson, California ... |
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Page 1
... gold value . 3. The presence of chalcopyrite is a definite indica- tion of high gold content . 4. The size of crystals and masses , the type of frac- ture or cleavage , and the color of pyrite are not universal criteria of value and can ...
... gold value . 3. The presence of chalcopyrite is a definite indica- tion of high gold content . 4. The size of crystals and masses , the type of frac- ture or cleavage , and the color of pyrite are not universal criteria of value and can ...
Page 22
... high gold value . The pyrite ascociated with the chalcopyrite has been proved by assay to be of low value , which indicates that the gold present is contained in the chalcopyrite . For this reason , chalcopyrite is considered a high - grade ...
... high gold value . The pyrite ascociated with the chalcopyrite has been proved by assay to be of low value , which indicates that the gold present is contained in the chalcopyrite . For this reason , chalcopyrite is considered a high - grade ...
Page 42
Donald Kenneth Gill. Chalcopyrite of high gold value was found in a large deposit of well crystallized pyrite . This is thought to be due to the slow deposition of a semi - stagnant body of solu- tion , probably caused by the gradual ...
Donald Kenneth Gill. Chalcopyrite of high gold value was found in a large deposit of well crystallized pyrite . This is thought to be due to the slow deposition of a semi - stagnant body of solu- tion , probably caused by the gradual ...
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