KEYSTONE, S.D. (AP) - Work has resumed at a gold exploration drilling site in western South Dakota where a leak occurred last week.
The site was shut down when bentonite leaked into Battle Creek near Keystone. Bentonite is a claylike material used as a drilling lubricant. State officials do not expect any environmental damage.
Mineral Mountain Resources Ltd. of Vancouver, British Columbia, is exploring for gold in the area.
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