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 7
Page 11
... fissure vein . According to Lindgren , mesothermal de- posits were formed at temperatures between 175 and 300 degrees C. , and at depths of from 4,000 to 12,000 feet . Ore deposi- tion was made possible by the ropeated opening of the ...
... fissure vein . According to Lindgren , mesothermal de- posits were formed at temperatures between 175 and 300 degrees C. , and at depths of from 4,000 to 12,000 feet . Ore deposi- tion was made possible by the ropeated opening of the ...
Page 34
... fissures tend to be crooked , and there is marked shearing of the wall - rock which is included in the veins to form typically banded ore . As the metadiorite is relatively hard and strong , its fissures tend to bo straight and regular ...
... fissures tend to be crooked , and there is marked shearing of the wall - rock which is included in the veins to form typically banded ore . As the metadiorite is relatively hard and strong , its fissures tend to bo straight and regular ...
Page 39
... fissure openings . These openings were not static , as they were continually being changed in size and shape by recurrent movement along the fissures and by deposition from the solu- tions . Added to this is the fact that the period of ...
... fissure openings . These openings were not static , as they were continually being changed in size and shape by recurrent movement along the fissures and by deposition from the solu- tions . Added to this is the fact that the period of ...
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