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 12
Donald Kenneth Gill. not at all uniform in value , but varies greatly over short distances . There is a marked layering of the ore in nearly horizontal planes . These layers vary from 10 to 30 feet in thickness , and the contact between ...
Donald Kenneth Gill. not at all uniform in value , but varies greatly over short distances . There is a marked layering of the ore in nearly horizontal planes . These layers vary from 10 to 30 feet in thickness , and the contact between ...
Page 13
... vary from microscopic size to speci- mens with faces two inches across ( see Plates No. 8 and 9 ) . The massive pyrite varies from small isolated specks to bands of nearly solid pyrite several inches wide and several feet in length and ...
... vary from microscopic size to speci- mens with faces two inches across ( see Plates No. 8 and 9 ) . The massive pyrite varies from small isolated specks to bands of nearly solid pyrite several inches wide and several feet in length and ...
Page 15
... vary from microscopic size to speci- mens with faces two inches across ( see Plates No. 8 and 9 ) . The massive pyrite varies from small isolated specks to bands of nearly solid pyrite several inches wide and several feet in length and ...
... vary from microscopic size to speci- mens with faces two inches across ( see Plates No. 8 and 9 ) . The massive pyrite varies from small isolated specks to bands of nearly solid pyrite several inches wide and several feet in length and ...
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