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
... feet , and range up to 30 feet in width with an average stoping width of about 12 feet . The ore bodies are generally irregular in shape , being longer in a vertical direction than in a horizontal direction . The ore in any one ore ...
... feet , and range up to 30 feet in width with an average stoping width of about 12 feet . The ore bodies are generally irregular in shape , being longer in a vertical direction than in a horizontal direction . The ore in any one ore ...
Page 12
... feet in thickness , and the contact between a layer of rich ore and a layer of nearly barren material is quite distinct . This layering makes the use of shrinkage stoping of doubtful value in certain cases . The rake of the ore shoots ...
... feet in thickness , and the contact between a layer of rich ore and a layer of nearly barren material is quite distinct . This layering makes the use of shrinkage stoping of doubtful value in certain cases . The rake of the ore shoots ...
Page 25
... feet along its strike , and to a depth of 450 feet by the Easyz Bird mine , owned by the Le Roi Mines , Incorporated . It is therefore by far the most accessible vein in the area , and lends itself to a more detailed study than would be ...
... feet along its strike , and to a depth of 450 feet by the Easyz Bird mine , owned by the Le Roi Mines , Incorporated . It is therefore by far the most accessible vein in the area , and lends itself to a more detailed study than would be ...
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