Transactions (1871) (14783671542)

Identifier: transactionsmining36amer (find matches)

Title: Transactions

Year: 1871 (1870s)

Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers

Subjects: Mineral industries

Publisher: New York (etc.)

Contributing Library: Gerstein - University of Toronto

Digitizing Sponsor: University of Toronto

Text Appearing Before Image:

5CHI5T KV • ^V\A^ FLUOR SPAR AND QUARTZ Fig. 25.—Diagram Illustrating the Type of Fissure-Vein Formed atthe Albemarle Zinc- and Lead-Mine, Albemarle County, Va. not continue on depth. It is the belief of the miners that thefluorite and blende increase in depth, and that the quartz andgalenite decrease. Sufficient depth has not been reached, norenough underground work done, to establish any relations ofthe ores to each other and to the gangue. LEAD- AND ZINC-DEPOSITS VIRGINIA-TENNESSEE REGION. 721 In addition to the principal ores, blende and galenite, somechalcopyrite occurs and some smithsonite. Some years ago,cerussite and azurite from the dumps were reported. Thegalenite is argentiferous, and arsenic and antimony are reportedin very small quantities. Fluorite is the principal gangue-

Text Appearing After Image:

GALEHAandSPHALERITE, t GALENA FLUORITE SPHAlHUt Fig. 26.—Specimen of Fluorite Lens, Showing Distribution of theSulphide Minerals, Sphalerite and Galenite. Albemarle Zincand Lead Companys Mine, Near Faber. About £ Natural Size. mineral, with more or less quartz, and a little calcite and feld-spar have been reported. The fluorite is mostly white, butquite a sprinkling of the violet shade occurs in places. The very close association of the vein with dikes of igneousrocks makes it reasonably certain that the ores are geneticallyrelated to the igneous intrusions. The evidence of such rela- 722 LEAD- AND ZINC-DEPOSITS VIRGINIA-TENNESSEE REGION. tionship is strengthened when the composition of the gangueand the metals is considered. The principal and abundantgangue-mineral, fluorite, and the metallic sulphide, argentifer-ous galenite, with traces of arsenic and antimony, constitute anassociation of minerals such as can best be explained on thesupposition of highly-heated conditions. Such

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1871

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