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 76
Page 11
... quartz , quartz crystals , and as bands with the metadiorite included in the vein . Second to quartz in volume of vein material is metadiorite , which occurs in a wide range of forms and stages of alteration . Some of the vein ...
... quartz , quartz crystals , and as bands with the metadiorite included in the vein . Second to quartz in volume of vein material is metadiorite , which occurs in a wide range of forms and stages of alteration . Some of the vein ...
Page 13
... Quartz is usually the predominant mineral forming the veins . The type of quartz occurring most frequently is a mas- sive " bull " quartz which is usually more or less fractured ( see Plate No. 4 ) . This type of quartz is found in ...
... Quartz is usually the predominant mineral forming the veins . The type of quartz occurring most frequently is a mas- sive " bull " quartz which is usually more or less fractured ( see Plate No. 4 ) . This type of quartz is found in ...
Page 13
... quartz , has been found in bands up to one foot wide which could be traced for about 100 feet . One such band ... quartz was deposited along this fault plane , and later movement crushed and brecciated this band of quartz . Thet ...
... quartz , has been found in bands up to one foot wide which could be traced for about 100 feet . One such band ... quartz was deposited along this fault plane , and later movement crushed and brecciated this band of quartz . Thet ...
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