Report discussing the U.S. Geological Survey's investigation of carnotite deposits found at Club Mesa, Colorado.

Abstract: San Miguel bench includes about 4 square miles in the southern part of T. 48 N., R. 17 W., New Mexico principal meridian, Montrose County, Colorado. Production of carnotite ore from the area has been about 15, 000 short tons having an estimated average graderof 0. 31 percent U3O8,and 1. 6 percent V2 05 Nearly all of the carnotite deposits occur in a single-continuous sandstone bed near the top of the Salt Wash member of the Jurassic Morrison formation. These deposits consist chiefly of sandstone impregnated with uranium- and vanadium-bearing minerals. They are irregular tabular-shaped masses ranging in size from a few short tons to 30, 000 short tons or more of minable carnotite ore. During the period November 27, 1951, to April 17, 1953, the U. S. Geological Survey drilled 309 holes totaling 92, 194 feet on the San Miguel bench. Reserves total about 43, 000 short tons of material 1 foot or more thick and contain 0,.10 percent or more U30 or 1. 0 percent or more V205. Of these reserves 3, 300 short tons occur in private land. These reserves are in ten deposits found by Geological Survey drilling. Potential reserves (reserves based on geologic evidence …

Report discussing the San Miguel bench and the production of carnotite from deposits consisting of sandstone with uranium- and vanadium-bearing minerals.

A report regarding carnotite resources of the Moon Mesa and Horse Mesa Areas, Mesa Montrose Counties, Colorado.

Abstract: Most of the uranium deposits in the Uravan and Gateway mining districts are in the persistent upper sandstone stratum of the Salt Wash member of the Morrison formation. Areas in which this stratum is predominantly lenticular have been differentiated from areas in which the stratum is predominantly nonlenticular. The most favorable ground for uranium deposits is in areas of lenticular sandstone where the stratum is underlain by continuous altered greenish-gray mudstone. Ore is localized in scour-and-fill sandstone beds within favorable areas of lenticular sandstone. Regional control of the movement of ore-bearing solutions in the principal ore-bearing sandstone zone is indicated by belts of discontinuously altered mudstone transitional in a northerly and southerly direction from an area of unaltered mudstone to areas of continuously altered mudstone ; and an area of unaltered mudstone in which no ore deposits are found and an increase in size, number, and grade of ore deposits from areas of discontinuously altered to continuously altered mudstone. Discrete regional patterns of ore deposits and altered mudstone are associated with Tertiary structures; where these structures and favorable host rocks occur in juxtaposition, regional controls appear to have localized ore deposits.

A photograph postcard (& negative) showing Denver & Rio Grande Western (DRGW), Silver Vista Excursion, locomotive 361, 2-8-0, climbing up along Cimarron Creek toward Cimarron, CO, too much water in the boiler.

A photograph print (& negative) showing Denver & Rio Grande Western (DRGW), 361, 2-8-0, narrow gauge, doubling the Silver Vista Excursion train, up the hill to the upper end of the wye so it could be turned, Cimarron, CO.

A photograph print (& negative) showing Denver & Rio Grande Western (DRGW), 361, 2-8-0, narrow gauge, on the Silver Vista Excursion train, Cimarron, CO.

A photograph print (& negative) showing Denver & Rio Grande Western (DRGW), 361, 2-8-0, narrow gauge, on the Silver Vista Excursion train, Cimarron, CO.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 316, 2-8-0,narrow gauge, Montrose, CO.

A photograph print showing Denver & Rio Grande Western (DRGW) 316, 2-8-0 (BLW, class C-16), narrow gauge, on passenger train, Montrose, CO.

A photograph print showing Denver & Rio Grande Western (DRGW) 316, 2-8-0,narrow gauge, on passenger train, Montrose, CO. (Note blind drivers on No. 2 & 3 wheels)

A photograph negative card showing Denver & Rio Grande Western (DRGW) 316, 2-8-0,narrow gauge, on a passenger train, Montrose, CO.

A photograph print showing Denver & Rio Grande Western (DRGW) 318, 2-8-0 (BLW, class C-18), narrow gauge, Montrose, CO.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 318, 2-8-0 (BLW, class C-18), at engine house in Montrose, CO.

A photograph print showing Denver & Rio Grande Western (DRGW) 344, 2-8-0 (BLW, class C-19), at engine house in Montrose, CO.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 361, 2-8-0 (BLW), formerly Crystal River RR, Cimarron, CO.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 361, 2-8-0, narrow gauge, emerging from the Black Canyon near Cimarron, CO, 7 cars, 10 mph.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 361, 2-8-0, on an escursion train, turning the front part of the train, at Cimarron, CO.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 361, 2-8-0, on an escursion train, returning around the wye for the rear portion of the train, Cimarron, CO. (Jack Riley at left)

A photograph postcard showing Denver & Rio Grande Western (DRGW) 361, 2-8-0, turning the rear part of train, Cimarron, CO.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 361, 2-8-0, on an excursion train stopped at the end of the wye track, Cimarron, CO.

A photograph postcard showing Denver & Rio Grande Western (DRGW) 361, 2-8-0, motive power for Rocky Mountain Railroad Club excursion special. 175 of the 248 passengers posing in front of the train, Cimarron, CO.

A photograph print showing Denver & Rio Grande Western (DRGW) 454, 2-8-2 (BLW), K-27) narrow gauge, ouside frame, Montrose, CO.