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Cleanup is still ongoing. So far, more than 50 large dump trucks full of soil have been removed with more to come, the publication noted.
A well operated by Anadarko Minerals Inc. spilled a "substantial" amount of oil in the central region of the Fort Peck Reservation in northeast Montana, according to local media.
An estimated 600 barrels of oil and 90,000 barrels of brine (production water) leaked from the well, the Glasgow Courier reported, citing officials with the reservation's Office of Environmental Protection and the Bureau of Land Management.