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
... mining operations where immediate knowledge of approximate value is necessary . For the purpose of this study , a specific gold mining area near the California Mother Lode was selected , where nearly all of the gold in the ore occurs ...
... mining operations where immediate knowledge of approximate value is necessary . For the purpose of this study , a specific gold mining area near the California Mother Lode was selected , where nearly all of the gold in the ore occurs ...
Page 4
... mines have been opened in the vicinity and have operated intermittently . The Easyz Bird mine is now the only mine operating with constant ... Mining Journal , Febr . 22 , 1913 . Engineer- 1 is a series of parallel veins lying in the 4.
... mines have been opened in the vicinity and have operated intermittently . The Easyz Bird mine is now the only mine operating with constant ... Mining Journal , Febr . 22 , 1913 . Engineer- 1 is a series of parallel veins lying in the 4.
Page 24
... mining activity , it is almost essential to be able to approximate the value of the ore as soon as it is broken and before time can be allowed for assay . Such immediate decisions are necessary for the efficient manage- ment of mines ...
... mining activity , it is almost essential to be able to approximate the value of the ore as soon as it is broken and before time can be allowed for assay . Such immediate decisions are necessary for the efficient manage- ment of mines ...
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