Carnotite resources of San Miguel bench, Montrose County, Colorado

Trace Elements Investigations 289
This report concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission



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 grade of 0.31 percent U3O8 and 1.6 percent V2O5.

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 U3O8 or 1.0 percent or more V2O5. 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 only) are predicted to total about 15,000 short tons, averaging 0.30 percent U3O8 and 1.6 percent V2O5.

No additional drilling in the San Miguel bench is planned by the Geological Survey. Some drilling by private enterprise is recommended.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Carnotite resources of San Miguel bench, Montrose County, Colorado
Series title Trace Elements Investigations
Series number 289
DOI 10.3133/tei289
Year Published 1955
Language English
Publisher U.S. Geological Survey
Description Report: 42 p.; Plate 1: 23.93 x 25.81 inches; Plate 2: 29.89 x 21.02
Country United States
State Colorado
County Montrose County
Google Analytic Metrics Metrics page
Additional publication details