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Geohydrologic reconnaissance of the Avoca lignite deposit area near Williston, northwestern North Dakota

Water-Resources Investigations Report 85-4024

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Abstract

The Avoca deposit in the Sentinel Butte member of Fort Union Formation consists of four potentially strippable lignite beds. Average bed thicknesses, in descending order, are 5, 5, 9, and 8 feet. In the area between Stony Creek and Crazy Man Coulee, the lignite beds are unsaturated, and between Stony Creek and Little Muddy River, only the two lowest beds are saturated. Aquifers in sandstone beds in the Fox Hills Sandstone and the Hell Creek Formation probably would yield as much as 50 gallons per minute of sodium bicarbonate type water. However, the aquifers are from 1,100 to 1,800 feet below land surface. Individual sand beds in the Tongue River and Sentinel Butte Members of the Fort Union Formation are the shallowest aquifers below the minable lignite beds. Properly constructed wells completed in these sand beds could yield as much as 40 gallons per minute. The water generally is a sodium bicarbonate type with dissolved-solids concentrations ranging from about 500 to 4,200 milligrams per liter. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Geohydrologic reconnaissance of the Avoca lignite deposit area near Williston, northwestern North Dakota
Series title:
Water-Resources Investigations Report
Series number:
85-4024
Edition:
-
Year Published:
1985
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
v, 22 p. :ill., map ;28 cm.