The Association of Alunite With Gold in the Goldfield District Nevada
The Association of Alunite With Gold in the Goldfield District Nevada
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Before pro- ceeding farther with genetic considerations I shall briefly describe the mineralogical character of the Goldfield ores.
THE GOLD ORES.
The typical unoxidized ore as it occurs in the dacite near Gold- field consists of pyrite, bismuthinite and a reddish-gray cuprifer- ous mineral having the general composition of tetrahedrite. Native gold is usually associated with these minerals, particu- larly with the bismuthinite and tetrahedrite, and in the rich ore may be easily visible. These ...minerals are often arranged in successive layers or crusts around silicified fragments of dacite, the inner crust being usually the richer.
The brownish copper-bearing mineral, here provisionally called tetrahedrite, contains antimony and sulphur, as chemically deter- mined by Dr. W. T. Schaller, and is therefore not bornite, although it goes by that name in the district. It appears so commonly as a constituent of the best ore that there is a strong suggestion that it is auriferous, particularly as the microscope fails in some specimens of reputed rich ore to reveal any free gold.
What to read after The Association of Alunite With Gold in the Goldfield District Nevada?
You can find similar books in the "Read Also" column, or choose other free books by Frederick Leslie Ransome to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Before pro- ceeding farther with genetic considerations I shall briefly describe the mineralogical character of the Goldfield ores.
THE GOLD ORES.
The typical unoxidized ore as it occurs in the dacite near Gold- field consists of pyrite, bismuthinite and a reddish-gray cuprifer- ous mineral having the general composition of tetrahedrite. Native gold is usually associated with these minerals, particu- larly with the bismuthinite and tetrahedrite, and in the rich ore may be easily visible. These ...minerals are often arranged in successive layers or crusts around silicified fragments of dacite, the inner crust being usually the richer.
The brownish copper-bearing mineral, here provisionally called tetrahedrite, contains antimony and sulphur, as chemically deter- mined by Dr. W. T. Schaller, and is therefore not bornite, although it goes by that name in the district. It appears so commonly as a constituent of the best ore that there is a strong suggestion that it is auriferous, particularly as the microscope fails in some specimens of reputed rich ore to reveal any free gold.
What to read after The Association of Alunite With Gold in the Goldfield District Nevada?
You can find similar books in the "Read Also" column, or choose other free books by Frederick Leslie Ransome to read onlineMoreLess
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