Geology of the Uranium Deposits of the Lukachukai Mountains Area Apache County, Arizona

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Abstract: In a study of the comparative importance of sedimentary and tectonic ore controls and in search of data bearing on the origin of the deposits, ten mines in the Lukachukai Mountains, Apache County, Arizona were examined in detail. All commercial deposits in the area are in the Salt Wash Member of the Morrison Formation of Jurassic age. The ore bodies are elongate and horizontally lenticular in shape and consist of one or more ore pockets surrounded or separated by protore. The composite length of ore bodies consisting of two or more ore pockets separated by subore grade material ranges … continued below

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64 p. : ill., maps ; 28 cm.

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Nestler, Ronald K. & Chenoweth, William L. September 1958.

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  • Main Title: Geology of the Uranium Deposits of the Lukachukai Mountains Area Apache County, Arizona
  • Series Title: RME
  • Series Title: Atomic Energy Commission Reports
  • Added Title: Atomic Energy Commission Report 118
  • Added Title: RME (Series) ; 118

Description

Abstract: In a study of the comparative importance of sedimentary and tectonic ore controls and in search of data bearing on the origin of the deposits, ten mines in the Lukachukai Mountains, Apache County, Arizona were examined in detail. All commercial deposits in the area are in the Salt Wash Member of the Morrison Formation of Jurassic age. The ore bodies are elongate and horizontally lenticular in shape and consist of one or more ore pockets surrounded or separated by protore. The composite length of ore bodies consisting of two or more ore pockets separated by subore grade material ranges up to 1,100 feet; individual ore pockets range up to 350 feet in length. Elongation is usually at least three times the width and is parallel to paleostream depositional trends measured in and near the ore bodies. Claystone and/or siltstone units nearly always underlie and frequently overlie the host sandstone units. Ore occurs most frequently in trough-type, cross-stratified sandstone which fills scours and channels in the underlying claystone units. Lithofacies maps and mine mapping show that ore bodies are restricted to areas of rapid lateral color change which in general are also areas of rapid change in the ratio of mudstone to sandstone. Most ore bodies are located on the southwest flank of the Chuska syncline within a broad belt which trends nearly north-south across the southeast end of the Lukachukai Mountains. It is suggested that a set of shear joints served as vertical channelways for the distribution of migrating uraniferous ground water. Location of the ore belt is apparently controlled by the intersection of these shear joints and particularly favorable facies of the Salt Wash Member.

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64 p. : ill., maps ; 28 cm.

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  • OCLC: 960870622
  • SuDoc Number: Y 3.At 7:22/RME-118
  • Report No.: RME-118
  • Archival Resource Key: ark:/67531/metadc784417

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  • September 1958

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  • July 30, 2017, 8:43 a.m.

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Nestler, Ronald K. & Chenoweth, William L. Geology of the Uranium Deposits of the Lukachukai Mountains Area Apache County, Arizona, report, September 1958; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc784417/: accessed June 11, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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