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 96
Page 114
... vein systems . On the surface and underground these rhyolite flows and ... north and south . The east - west veins are said to have been first ... system has not yet been disclosed , nor is it known how many such veins remain to be ...
... vein systems . On the surface and underground these rhyolite flows and ... north and south . The east - west veins are said to have been first ... system has not yet been disclosed , nor is it known how many such veins remain to be ...
Page 189
... vein system at Pachuca and Real del Monte ; the north - south fracture system at Real del Monte contains essentially no dikes and probably was , therefore , developed largely after the dikes were emplaced . The high - angle normal ...
... vein system at Pachuca and Real del Monte ; the north - south fracture system at Real del Monte contains essentially no dikes and probably was , therefore , developed largely after the dikes were emplaced . The high - angle normal ...
Page 167
... north - south contemporaneous conjugated systems are the oldest veins ; That ... system , but that it is probably of the same age as the north- south veins ; That reversed ... SYSTEMS . Relation of the vein systems to geological structure.
... north - south contemporaneous conjugated systems are the oldest veins ; That ... system , but that it is probably of the same age as the north- south veins ; That reversed ... SYSTEMS . Relation of the vein systems to geological structure.
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