 | | Report (volume) | | dark shale and sandstone of the Colorado Formation. North of Johnny Gulch in the southeastern part of the...the Elkhorn Mountains Volcanics. South of Johnny Gulch, outside the study area, the Elkhorn Mountains Volcanics... and sodic plagioclase are present but sparse. Topaz is commonly found in miarolitic cavities. At Lava...crop out along and near Crow Creek from Sagebrush Gulch eastward in the southeastern corner of the study...uplift occurred after deposition of the Cretaceous Colorado Formation and prior to the deposition of the Elkhorn |  | | Report (issue) | | Kootenai Formation ____________ -1- ______________ _ Colorado Formation ____________ Lower unit ________________...__________________________________ _ Flow-layered topaz-bearing rhyolite ______ _ lRhyolite porphyry _____________________...I I I I TABLE 1. Correlation b~tween the Colorado Formation as used in the Elkhorn Mountains and...top. The Koote-nai Formation is overlain by the Colorado Formation of Early and Late Cretaceous age-an...nonmarine quartz-chert sandstone and siltstone. The Colorado Formation is overlain by the Slim Sam Formation |  | | Report (issue) | | ore during the study. Jefferson and Broadwater County records show that 1,106 lode and 275 placer claims...interbedded with shale or mudstone. North of Johnny Gulch in the eastern part of the area, the epiclastic...Elkhorn Mountains Volcanics. However, south of Johnny Gulch the Elkhorn Mountains Volcanics rest with angular... and sodic plagioclase are present but sparse. Topaz is commonly found in miarolitic cavities. At Lava...crop out along and near Crow Creek from Sagebrush Gulch eastward. The basalt flows locally rest on sedimentary |  | | Report (volume) | | Mines. 11312 Hessler Road, Cleveland, Ohio. Aspen, Colorado. BOYLSTON, Herbert M., Consulting Metallurgical...Mexico. BUTCHART, W. A., Ore Concentration, Denver, Colorado. BUTLER, G. M., Mining Engineer and Geologist...Denver. Liberty Bell Gold Mining Co., Telluride, Colorado. COLE & CO., Assayers, Chemists, Ore Buyers, Box...Metallurgist, 804 Equitable Building, Denver, Colorado. GARDNER, James H., Geologist, 121 E. 6th St....Engineer and Geologist, 824 Vine St., Denver, Colorado. RUTHERFORD, Forest, Consulting Engineering. Mining |
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