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 1-2 of 2
Page 6
... degrees W. , and the east - west system striking about N. 65 degrees E. Both systems are composed of several well defined quartz veins . The north - south vein system consists of many roughly parallel veins striking N. 25 degrees W. and ...
... degrees W. , and the east - west system striking about N. 65 degrees E. Both systems are composed of several well defined quartz veins . The north - south vein system consists of many roughly parallel veins striking N. 25 degrees W. and ...
Page 10
... 65 degrees E. , and the dip is from 70 to 90 degrees to the north , except where the vein is contorted by cross - faults . about 10 feet ; but in places it is as much as 30 feet wide , and in exceptional locations it narrows to a gouge ...
... 65 degrees E. , and the dip is from 70 to 90 degrees to the north , except where the vein is contorted by cross - faults . about 10 feet ; but in places it is as much as 30 feet wide , and in exceptional locations it narrows to a gouge ...
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