National Uranium Resource Evaluation: Cortez Quadrangle, Colorado and Utah

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From Introduction: "The Cortez 1º x 2º Quadrangle, southwestern Colorado and southeastern Utah (Fig. 1), was studied to identify and evaluate areas and geologic formations that are favorable for the occurrence of uranium deposits of specific minimum size and grade."

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vi, 65 p. : ill., maps (13 folded)

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Campbell, John A.; Franczyk, Karen J.; Lupa, Robert D. & Peterson, Fred September 1982.

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From Introduction: "The Cortez 1º x 2º Quadrangle, southwestern Colorado and southeastern Utah (Fig. 1), was studied to identify and evaluate areas and geologic formations that are favorable for the occurrence of uranium deposits of specific minimum size and grade."

Physical Description

vi, 65 p. : ill., maps (13 folded)

Notes

Abstract: Six stratigraphic units are recognized as favorable for the occurrence of uranium deposits that meet the minimum size and grade requirements of the U.S. Department of Energy in the Cortez 1° x 2° Quadrangle, Utah and Colorado. These units include the Jurassic Salt Wash, Recapture, and Brushy Basin Members of the Morrison Formation and the Entrada Sandstone, the Late Triassic Chinle Formation, and the Permian Cutler Formation. Four areas are judged favorable for the Morrison members which include the Slick Rock, Montezuma Canyon, Cottonwood Wash and Hatch districts. The criteria used to determine favorability include the presence of the following (1) fluvial sandstone beds deposited by low-energy streams; (2) actively moving major and minor structures such as the Paradox Basin and the many folds within it; (3) paleostream transport directions approximately perpendicular to the trend of many of the paleofolds; (4) presence of favorable gray lacustrine mudstone beds; and (5) known uranium occurrences associated with the favorable gray mudstones. Two areas of favorability are recognized for the Chinle Formation. These areas include the Abajo Mountain and Aneth-Ute Mountain areas. The criteria used to determine favorability include the sandstone-to-mudstone ratio for the Chinle Formation and the geographic distribution of the Petrified Forest Member of the Chinle Formation which is considered as the possible source for the uranium. Two favorable areas are recognized for the Cutler Formation. Both of these areas are along the northern border of the quadrangle between the Abajo Mountains and the Dolores River Canyon area. Criteria used to outline these areas are the distribution of facies within the formation. Favorable facies are those which include the depositional environments that are transitional between fluvial and marine. Two areas are judged favorable for the Entrada Sandstone. One area is in the northeast corner of the quadrangle in the Placerville district and the second is along the eastern border of the quadrangle on the southeast flank of the La Plata Mountains. The boundaries of these two areas were determined by geologic mapping.

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  • OCLC: 981767632
  • SuDoc Number: E 1:28/PGJ/F-051(82)
  • Report No.: PGJ/F-051(82)
  • Archival Resource Key: ark:/67531/metadc957755

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Technical Report Archive and Image Library

The Technical Report Archive & Image Library (TRAIL) identifies, acquires, catalogs, digitizes and provides unrestricted access to U.S. government agency technical reports. The mission of TRAIL is to ensure preservation, discoverability, and persistent open access to government technical publications regardless of form or format.

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Related Items

National Uranium Resource Evaluation: Cortez Quadrangle, Colorado and Utah, Appendix A-E (Dataset)

National Uranium Resource Evaluation: Cortez Quadrangle, Colorado and Utah, Appendix A-E

Appendices containing data on uranium availability in the Cortez Quadrangle to accompany a report on U.S. uranium resources in Colorado and Utah.

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National Uranium Resource Evaluation: Cortez Quadrangle, Colorado and Utah, Appendix A-E, ark:/67531/metadc1228124

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  • September 1982

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  • Oct. 25, 2017, 10:43 p.m.

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  • June 26, 2020, 3:58 p.m.

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  • N:38.0, E:-108.0, S: 37.0, W:-110.0

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Campbell, John A.; Franczyk, Karen J.; Lupa, Robert D. & Peterson, Fred. National Uranium Resource Evaluation: Cortez Quadrangle, Colorado and Utah, report, September 1982; (https://digital.library.unt.edu/ark:/67531/metadc957755/: accessed June 6, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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