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 26
... photographs of the specimens in their natural form were taken with a Zeiss Contessa Nettal camera with a 16.5 centi- meter , f 2.7 lens and a focal plane shutter . A bellows exten- sion was used , so that the lens was about 12 inches ...
... photographs of the specimens in their natural form were taken with a Zeiss Contessa Nettal camera with a 16.5 centi- meter , f 2.7 lens and a focal plane shutter . A bellows exten- sion was used , so that the lens was about 12 inches ...
Page 43
Donald Kenneth Gill. 1 . 1 1 PHOTOGRAPHS The following photographs show some of the specimens studied.
Donald Kenneth Gill. 1 . 1 1 PHOTOGRAPHS The following photographs show some of the specimens studied.
Page 44
... . The distances referred to are east from point A along the 420 drift , or west from point B along the 401 drift , as showm on the map . 1 ... " Graph showing correlation of value of pyrite 44 Introduction to Photographs Photographs.
... . The distances referred to are east from point A along the 420 drift , or west from point B along the 401 drift , as showm on the map . 1 ... " Graph showing correlation of value of pyrite 44 Introduction to Photographs Photographs.
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