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 27
... speci- mens . Care was taken to select surfaces which would as nearly as possible be representative of the specimens , and which would expose enough pyrite to be adequately studied . The chips were ground down to flat surfaces on a 12 ...
... speci- mens . Care was taken to select surfaces which would as nearly as possible be representative of the specimens , and which would expose enough pyrite to be adequately studied . The chips were ground down to flat surfaces on a 12 ...
Page 28
... speci- mens were developed in ABC Pyro developer . To ensure con- trast , the negatives from the pictures of the polished speci- mens were developed in D - 11 developer . The prints were made by contact printing , using Azo F3 chloride ...
... speci- mens were developed in ABC Pyro developer . To ensure con- trast , the negatives from the pictures of the polished speci- mens were developed in D - 11 developer . The prints were made by contact printing , using Azo F3 chloride ...
Page 44
Donald Kenneth Gill. PHOTOGRAPHIS The following photographs show some of the speci- mens studied in their natural form and as sections . The arrangement of the specimens presented is according to the calculated gold content of the pyrite ...
Donald Kenneth Gill. PHOTOGRAPHIS The following photographs show some of the speci- mens studied in their natural form and as sections . The arrangement of the specimens presented is according to the calculated gold content of the pyrite ...
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