This material, pictured next to a penny to show its size, is a proppant used in the hydraulic fracturing, or fracking, process that has allowed oil drillers to retrieve oil stuck deep within the Bakken. A large mass of clay material that’s good for use as a proppant has been located in Stark and Dunn counties.
Read the article: Clay under Stark, Dunn counties a boon: Study reveals massive load of fracking material
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