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Hydraulic characterization of Midnite Mine, Wellpinit, WA.: summary of 1994 field season.
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9606, 1996 Jan; :1-38
The Midnite Mine is an inactive uranium mine on the Spokane Indian Reservation in Washington State. Preliminary results of hydraulic stress tests performed in the bedrock at the site are described. Slug tests and pumping tests were conducted using preexisting USBM monitoring wells. Slug test results were used to generate hydraulic conductivity estimates for fractured and unfractured intrusives. The pumping tests demonstrated varying degrees of spatial continuity. Hydraulically continuous fractured zones along north-south planes were demonstrated in two cases for distances of 90 and 116 m (300 and 380 ft). The short-term pumping tests provided no evidence of east-west hydraulic continuity in fractured zones.
Abandoned-sites; Acid-mine-drainage; Base-flow; Fracture-zones; Ground-water; Groundwater-movement; Hydraulic-conductivity; Hydrogeology; Leaching; Metals; Mine-waters; Monitoring-wells; Pumping; Rock-fluid-interactions; Uranium-mines
Report of Investigations
NTIS Accession No.
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9606
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division