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Denver, Denver Equipment Company. 1968. Soft Cover. Bulletin No. M4-B133. Stapled softcover with 3-ring binder holes, size: 4to. 4 pages, photo-illustrated. History of the Mammoth Revenue Mine (gold and silver), in Conejos County, Colorado, and the Platoro Project, a 1959 re-opening of the dormant mine. Lots of technical data about ores, milling & crushing, flotation, etc. Also, a flowsheet of the Platoro Project. Booklet has scant wear. Small ink notation at top of front cover. VG. Very Good.

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