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U.S. Department of Agriculture (USDA) Secretary Sonny Perdue and Governor Mark Gordon visit an open-pit coal mine, in the Thunder Basin National Grassland, near Wright, Wyoming, on July 29, 2019.

Up to five unmanned bulldozers can operate while under control from a remote station at this mining facility. USDA Photo By Lance Cheung. Original public domain image from Flickr

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3259423

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U.S. Department of Agriculture (USDA) Secretary Sonny Perdue and Governor Mark Gordon visit an open-pit coal mine, in the Thunder Basin National Grassland, near Wright, Wyoming, on July 29, 2019.

More