. Transactions. Fig. 10.—Specularite Replacing Calcite. (Sp. No. 313 ; Without Ana-lyzer, x 66-f.) From Wall of E-W. Fissure, West End No. 6 Level,Highland Boy Mine. The black areas are foils of specularite (S) which replace calcite (C). The handspecimen from which this thin section was made shows chalcopyrite intergrownwith specularite and replacing Fig. 11.—Chalcopyrite with Zinc Blende and Garnet in Calcite. ( B. 16; Without Analyzer, With Converger, x 36.) From Meta-morphosed Limestone 60 ft. from Monzonite Intrusive, No. 7 Level,Highland Boy darkest areas (Ch) are i

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. Transactions. Fig. 10.—Specularite Replacing Calcite. (Sp. No. 313 ; Without Ana-lyzer, x 66-f.) From Wall of E-W. Fissure, West End No. 6 Level,Highland Boy Mine. The black areas are foils of specularite (S) which replace calcite (C). The handspecimen from which this thin section was made shows chalcopyrite intergrownwith specularite and replacing Fig. 11.—Chalcopyrite with Zinc Blende and Garnet in Calcite. ( B. 16; Without Analyzer, With Converger, x 36.) From Meta-morphosed Limestone 60 ft. from Monzonite Intrusive, No. 7 Level,Highland Boy darkest areas (Ch) are intergrowths of chalcopyrite and pyrite. They fringe the zinc blende (Z) and are intergrown with it and green garnet (G). The groundmass is calcite (C). GENESIS OF THE ORE-DEPOSITS AT BINGHAM, UTAH, 563

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries