A Study of the Visible Indications of Ore Value in the Metadiorite of the Mother Lode Area Near Jackson, California ... |
From inside the book
Results 1-3 of 49
Page 13
... Magnification : Natural size . Remarks : This specimen is part of a large body of barren quartz . It is milk - white in color , and is oderately fractured . Only thin edges are transparent . Sugar quartz ( see Plate No. 5 ) , which ...
... Magnification : Natural size . Remarks : This specimen is part of a large body of barren quartz . It is milk - white in color , and is oderately fractured . Only thin edges are transparent . Sugar quartz ( see Plate No. 5 ) , which ...
Page 13
... 420 drift Position in vein , adjacent to foot - wall . Value , trace . Pyrite percentage , 0 % . Calcite , as cement of quartz fragments . Magnification : Specimen No. 36 Location : Level , 450 Distance , 8x natural size . Plate o . 5 .
... 420 drift Position in vein , adjacent to foot - wall . Value , trace . Pyrite percentage , 0 % . Calcite , as cement of quartz fragments . Magnification : Specimen No. 36 Location : Level , 450 Distance , 8x natural size . Plate o . 5 .
Page
... with some inperfect cubic crystals . Fracturing , very little . Replacement , none . Magnification : Specimen , natural size . Specimen No. 33 Location : Level , 450 420 drift Section , 5x natural size . Plate No. 25.
... with some inperfect cubic crystals . Fracturing , very little . Replacement , none . Magnification : Specimen , natural size . Specimen No. 33 Location : Level , 450 420 drift Section , 5x natural size . Plate No. 25.
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