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 24
... assay . Such immediate decisions are necessary for the efficient manage- ment of mines , and the accuracy with which they are made has a bearing upon the economic success of the mining ventures . When sulphide concentrates are shipped ...
... assay . Such immediate decisions are necessary for the efficient manage- ment of mines , and the accuracy with which they are made has a bearing upon the economic success of the mining ventures . When sulphide concentrates are shipped ...
Page 26
... assayed would be as truly representative of the specimen as possible . One - assay ton charges were used in the assay of all specimens except those consisting of nearly pure pyrite , in which cases one - half - assay ton charges were ...
... assayed would be as truly representative of the specimen as possible . One - assay ton charges were used in the assay of all specimens except those consisting of nearly pure pyrite , in which cases one - half - assay ton charges were ...
Page 28
... assay value of the specimen by the decimal value of the pyrite percentage . INACCURACIES IN STUDY There are several sources of error which should be noted in connection with the methods used in this tudy . HOW- ever , none of them are ...
... assay value of the specimen by the decimal value of the pyrite percentage . INACCURACIES IN STUDY There are several sources of error which should be noted in connection with the methods used in this tudy . HOW- ever , none of them are ...
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