Map of North Dakota showing the locations of three gold mines that operated in the late 19th and early 20th centuries. The hatched area, mainly in McHenry County, is the sand and silt of glacial Lake Souris; small amounts of gold occur throughout this area .
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At the time these mines were surveyed, 7 mines in North Dakota were observed to have ore mineralization in an outcrop, shallow pit, or isolated drill holeknown as an occurance mine. 1 North Dakota has 3 prospect mines. 2 17 mines were in production at the time the data was entered into USGS records.