Yesterday we flew from Denver to Gilette, Wyoming to take aerial photos and on the way we passed numerous coal mines. In fact, after returning I read on wikipedia that the Powder River Basin "is the single largest source of coal mined in the United States, and contains one of the largest deposits of coal in the world." I took a couple of photos but had some camera difficulty so this is all that turned out of that particular area:
Since moving out west I've loved the appearance of geological survey mapping - with the large swatches of multi-color shapes representing different mineral deposits. You should also check out this beautiful map by the Wyoming State Geological Survey:
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