Molson Coors plans to source part of the electricity for its Golden Valley operations from an unusual place: a former coal mine in Keenesburg, Colorado, which is being converted into a solar farm. Here's what to know A rural property once used for coal production in the 1980s is now being redeveloped for solar — to the tune of 16,000 panels, according to Denver7. That means the property will be used instead of producing fossil fuels to generate …