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From the site: "Coal Pillar Locations are pillars of coal that must remain in place to provide support for an oil and gas well on the surface."
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Resource List
View within SubmissionGathering Resources...The locations of 1,879 coal mines and facilities, 8 uranium mines, and 1,965 mines and processing plants for 74 types of nonfuel minerals and materials are shown with symbols on...-
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Resource List
View within SubmissionGathering Resources... -