Uranium hydrogeochemical and stream sediment reconnaissance of the Gallup NTMS quadrangle, New Mexico/Arizona, including concentrations of forty-two additional elements

Technical Report · Fri Aug 01 04:00:00 EDT 1980

OSTI ID:5115213

Maassen, L W; LaDelfe, C M; Trujillo, D; Minor, M M; Gallimore, D L; Martell, C J; Martinez, R G; McInteer, C

LASL conducted a hydrogeochemical and stream sediment reconnaissance for uranium in the Gallup NTMS quadrangle, New Mexico/Arizona, as part of the National Uranium Resource Evaluation. Totals of 516 water and 1403 sediment samples were collected from 1856 locations over a 20 100 km/sup 2/ area at an average density of one location per 11 km/sup 2/. Water samples were collected from streams, springs, and wells. Sediment samples were collected from streams and springs. Water samples were analyzed for uranium; sediment samples were analyzed for uranium and 41 additional elements. All field and analytical data are listed in the appendixes of this report; however, only uranium is discussed herein. The uranium concentrations in water samples range from below the detection limit of 0.02 parts per billion (ppB) to 493.53 ppB with a median for all water types of 1.60 ppB. Waters with uranium concentrations above the anomaly threshold of 20 ppB were collected predominately from shallow wells in alluvial stream beds. These streams drain primarily Chinle and Bidahochi formations in the western and southern portion of the quadrangle, and Menefee formation north of Gallup. Sediment samples from the quadrangle were found to have uranium concentrations that range from 1.00 parts per million (ppM) to 25.20 ppM with a median for all sediment types of 2.85 ppM. Three groups of sediment samples with uranium concentrations over the arbitrary anomaly threshold of 6 ppM were delineated.

• Research Organization: Los Alamos Scientific Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5115213
• Report Number(s): GJBX-186(80); LA-8002-MS
• Country of Publication: United States
• Language: English

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