2014-04-10_GENERAL DOCUMENTS - M2014011 (2)

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PART 3. COLORADO C53 The Fort Defiance prospects are in weak stockworks in limestone, the main fractures of which strike eastward and northward and are mostly nearly vertical. Porous silicified breccia contains masses of cerussite surrounding a little unoxidized and silver -lean galena, chal- cocite and malachite, spongy boxworks of limonite, and a very little smithsonite. Many of the deposits near the site of Carbonate (fig. 6) are in thin vertical fissure veins peripheral to a small 'basaltic volcanic neck with a scoria core, probably of Tertiary age. The neck intrudes Leadville Limestone, which is locally metamorphosed to marble im- mediately adjacent to the contact with basalt; the veins, 6 inches to 6 feet wide, pinch and swell slightly along their traceable lengths of 1501,000 feet and contain some smithsonite, a little cerussite and galena, jarosite, brown jasperoid, and calcite. A 3 -foot channel sam- ple across the middle vein at the prospect northeast of the west main shaft yielded the following results when partly analysed: Partial analysis of 3-foot channel sample from a vein near site of Carbonate [Analysis by Deason and Nichols, Salt Lake City, 19541 Gold--------------------------------------- - - - - -- None Silver----------------------- - - - - -- -ounce per ton -- 0.20 Lead ------------------------------------ percent -- .3 Zinc--------------------------------------- do - - -- 13.9 Silica------- - - - - -- ------------------------ do - - -- 37.4 Carbonate---------------------------------- do - - -- 28.1 The Windy Point (or Strong) mine (pl. 1, no. 10) contains the largest deposits of oxidized ores known in the district. They are small but rich bodies of zinc -lead ores containing a little copper and very little silver in limestones and dolomites of the Chaffee Formation and the Leadville Limestone. Oxidized zinc resources. —Known oxidized zinc deposits, though common and spread widely over the White River Plateau, are very small, except those at the Windy Point mine. Unless new deposits larger than those already known are found, the Carbonate district will probably never produce more than a few thousand tons of commercial - grade oxidized zinc ore. RIFE CRE,FK DISTRICT Plate 1, nos. 8, 9 Location. —The Sunshine Lode mine and nearby prospects of the Rifle Creek district are about 16 miles by road north of Rifle and about 2 miles north of the large vanadium mines on East Fork near the fish hatchery. Development and production,. —The Sunshine Lode mine was first opened as the Grandview mine in 1925 and was operated until 1932. The mine was reopened in 1940 by Mr. Lale Harmon, and it produced