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 11
... mineral present . The Easyz Bird vein may be classified as a mesothermal 1 filled fissure vein . According to Lindgren , mesothermal de- posits were formed at temperatures between 175 and 300 degrees C. , and at depths of from 4,000 to ...
... mineral present . The Easyz Bird vein may be classified as a mesothermal 1 filled fissure vein . According to Lindgren , mesothermal de- posits were formed at temperatures between 175 and 300 degrees C. , and at depths of from 4,000 to ...
Page 33
... minerals in the Mother Lode , as well as in other mineral districts , have been a favorite subject for study . Many the- ories and hypotheses have been advanced on this subject . Some facts about the deposition of ore in this region ...
... minerals in the Mother Lode , as well as in other mineral districts , have been a favorite subject for study . Many the- ories and hypotheses have been advanced on this subject . Some facts about the deposition of ore in this region ...
Page 38
... mineral to precipitate . The periods of precipitation of the various minerals , however , are not separated by defi- nite lines of demarcation . While quartz is the first mineral to start depositing , it is known also to have been ...
... mineral to precipitate . The periods of precipitation of the various minerals , however , are not separated by defi- nite lines of demarcation . While quartz is the first mineral to start depositing , it is known also to have been ...
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