Geology and ore deposits of the Monument Valley area, Apache and Navajo Counties, Arizona

Witkind, Irving Jerome

doi:10.3133/ofr57124

Cited by 7 publications

(17 citation statements)

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“…(Witkind and Thaden, 1963). Underground and strip mining were conducted from 1949 until the mill closed in 1968.…”

Section: Doeiau62350-43 25-mar-96mentioning

confidence: 99%

“…The coarser-grained materials (i.e., conglomerate) are generally at the base of the unit, grading upward into finergrained materials (Le., sandstone and some mudstone). The most probable method of deposition for the unit was as alluvial fans (Witkind and Thaden, 1963 (DOE, 1993). The porosity is estimated to be about 0.25 (DOE, 1995).…”

Section: Geoloaymentioning

confidence: 99%

“…The color of the Moenkopi Formation contrasts greatly with the light gray of the Shinarump Conglomerate and the light tan of the De Chelly Sandstone. The unit likely was deposited in a near-shore mud-flat type of environment, where lagoons, playas, and deltas formed (Witkind and Thaden, 1963 …”

Section: Geoloaymentioning

confidence: 99%

“…Calcium carbonate, silica, and iron oxide are present as intergranular cement (Witkind and Thaden, 1963) that restricts pore spaces and decreases the hydraulic conductivity. The hydraulic conductivity is estimated to be several orders of magnitude lower than the overlying and underlying formations.…”

Section: Hvdroloqymentioning

confidence: 99%

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Baseline risk assessment of ground water contamination at the Monument Valley uranium mill tailings site Cane Valley, Arizona

1996

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Human health may be at risk from exposure to ground water contaminated by uranium ore processing. Exposure could occur by drinking water pumped out of a hypothetical well drilled in the contaminated areas. Adverse ecological and agricultural effects may also result from exposure to contaminated ground water. For example, livestock should not be watered with contaminated ground water.A risk assessment describes a source of Contamination, how that contamination reaches people and the environment, the amount of contamination to which people or the ecological environment may be exposed, and the health or ecological effects that could result from that exposure. This risk assessment is a site-specific document that will be used to evaluate current and potential future impacts to the public and the environment from exposure to contaminated ground water. The results of this evaluation and further site investigations will be used to determine a compliance strategy to comply with the UMTRA ground water standards. RISK SUMMARYIn the area of the Monument Valley site, the Navajo people use ground water as the sole source of water for domestic and agricultural purposes. Access to the ground water is not restricted. However, no current users of the shallow site-related contaminated ground water for domestic and agricultural purposes have been identified. Since people are not exposed there is no risk to human health. This situation will continue if land and water use at the site does not change. It should be noted, however, that several plant species have been identified in the vicinity of the site that are used by the Navajo people as a cultural resource. The potential for adverse health effects to occur from these uses is not evaluated in this document.This risk assessment evaluates possible future health problems associated with exposure to site-related contaminated ground water; the results indicate some health problems could occur if contaminated ground water were used as drinking water. Consequently, it is recommended that the site-related contaminated ground water should not be used as drinking water.Potential impacts of site-related contaminated ground water on agricultural resources indicate that the contaminated shallow ground water would not be a suitable source of drinking water for livestock and there could also be negative impacts on plants irrigated with the contaminated ground water. Additionally, if a pond was created in the future, the contaminated ground water would not be suitable for aquatic life to inhabit. GROUND WATER QUALITY AND USES Backqround qround water uualitvBackground ground water quality is the natural quality of ground water if uranium milling activities had not taken place. Background ground water is generally a sodium-bicarbonate type with low total dissolved solids (TDS) and a low sulfate to chloride ratio. Site-related qround water qualityGround water was sampled in three ground water bearing units ( The contaminated alluvial ground water has high TDS levels in comparison to background lev...

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“…(Witkind and Thaden, 1963). Underground and strip mining were conducted from 1949 until the mill closed in 1968.…”

Section: Doeiau62350-43 25-mar-96mentioning

confidence: 99%

Section: Geoloaymentioning

confidence: 99%

Section: Geoloaymentioning

confidence: 99%

Section: Hvdroloqymentioning

confidence: 99%

See 2 more Smart Citations

Baseline risk assessment of ground water contamination at the Monument Valley uranium mill tailings site Cane Valley, Arizona

1996

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“…ID (Thaden and others, 1964;Young, 1964;Finch, 1959;Malan, 1968: Witkind andThaden, 1963), have significant ore deposits in the carbonaceous sandstone and conglomerate of the basal Shinarump Member of the Chinle Formation of Late Triassic age.…”

Section: Uranium Provincesmentioning

confidence: 99%

Preliminary map of uranium provinces in the conterminous United States

Byers¹,

Finch²

1984

Open-File Report

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Modification to the Remedial Action Plan and site design for stabilization of the inactive uranium mill tailings site at Mexican Hat, Utah: Volume 1, Text, Attachments 1--6. Final report

1989

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Geology and ore deposits of the Monument Valley area, Apache and Navajo Counties, Arizona

Cited by 7 publications

References 0 publications

Baseline risk assessment of ground water contamination at the Monument Valley uranium mill tailings site Cane Valley, Arizona

Baseline risk assessment of ground water contamination at the Monument Valley uranium mill tailings site Cane Valley, Arizona

Preliminary map of uranium provinces in the conterminous United States

Modification to the Remedial Action Plan and site design for stabilization of the inactive uranium mill tailings site at Mexican Hat, Utah: Volume 1, Text, Attachments 1--6. Final report

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