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 13
... completely altered to transparent tale . In addition to forming the wall rock of the veins , the shattered metadiorite often forms nearly the entire body of the vein , and it is always an important feature of the vein composition ...
... completely altered to transparent tale . In addition to forming the wall rock of the veins , the shattered metadiorite often forms nearly the entire body of the vein , and it is always an important feature of the vein composition ...
Page 32
... about which different opin- ions are held . The structural geology of the Mother Lode has been closely studied . Although it is not completely understood , the general character of the structures are well enough de- 32 Ore Deposition.
... about which different opin- ions are held . The structural geology of the Mother Lode has been closely studied . Although it is not completely understood , the general character of the structures are well enough de- 32 Ore Deposition.
Page 38
... completely deposited , and thus occurs in intimate association with the pyrite . The deposition of the minerals from solution was caused by cooling of the solutions and , probably to a greater extent , by volatilization of the ascending ...
... completely deposited , and thus occurs in intimate association with the pyrite . The deposition of the minerals from solution was caused by cooling of the solutions and , probably to a greater extent , by volatilization of the ascending ...
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