I just came across these two maps that show where some coal mining activity occurred in Colorado Springs. My day job sits right above one of these areas — in the Rockrimmon arial photo one of the trucks in the parking lot is mine (I had to look very, very close). Also nearby is an old coke oven from the Pikeview mine. I find it fascinating; I hope you do too.
abandoned-mines-rockrimmon (PDF)
abandoned-mines-cragmoor (PDF)