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
... wall rock and vein inclusions . Partial quartz replacement of the metadiorite inclusions is universal in the area . Calcite is widely distributed in the veins and wall rock as impregnations , as irregular masses associated with quartz ...
... wall rock and vein inclusions . Partial quartz replacement of the metadiorite inclusions is universal in the area . Calcite is widely distributed in the veins and wall rock as impregnations , as irregular masses associated with quartz ...
Page 15
... wall rock and vein inclusions . Fartial quartz replacement of the metadiorite inclusions is universal in the area . Calcite is widely distributed in the veins and wall rock as impregnations , as irregular masses associated with quartz ...
... wall rock and vein inclusions . Fartial quartz replacement of the metadiorite inclusions is universal in the area . Calcite is widely distributed in the veins and wall rock as impregnations , as irregular masses associated with quartz ...
Page 35
... wall - rock of this area makes possible the use of a very efficient and economical system of mining . The meta- diorite walls are so strong that shrinkage stoping is employed and the stopes are left open after the ore has 35.
... wall - rock of this area makes possible the use of a very efficient and economical system of mining . The meta- diorite walls are so strong that shrinkage stoping is employed and the stopes are left open after the ore has 35.
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