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 12
... material is quite distinct . This layering makes the use of shrinkage stoping of doubtful value in certain cases . The rake of the ore shoots is consistent throughout the vein at about 50 degrees to the east . This is thought to be due ...
... material is quite distinct . This layering makes the use of shrinkage stoping of doubtful value in certain cases . The rake of the ore shoots is consistent throughout the vein at about 50 degrees to the east . This is thought to be due ...
Page 26
Donald Kenneth Gill. All specimens were carefully sampled for assay , so that the material assayed would be as truly representative of the specimen as possible . One - assay ton charges were used in the assay of all specimens except ...
Donald Kenneth Gill. All specimens were carefully sampled for assay , so that the material assayed would be as truly representative of the specimen as possible . One - assay ton charges were used in the assay of all specimens except ...
Page 29
... material found in the specimens , and to use as large an amount of material as was practicable . This ma- terial was chipped from the specimen after which it as crushed , quartered , and ground in the conventional manner . Because The ...
... material found in the specimens , and to use as large an amount of material as was practicable . This ma- terial was chipped from the specimen after which it as crushed , quartered , and ground in the conventional manner . Because The ...
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