The silver mines in Aspen, Colorado is what put it on the map & are still scattered all throughout the valley. A keen eye on many local hikes can find a trace of mining history. You can see the cone shaped piles of dirt & rock which are mine dumps. Sometimes you can find mine shafts & entrances, many of which have had there entrances closed in the keep the curious out, (do not to enter abandoned mines).
Take a hike on local trails around Aspen, Colorado to discover your own Aspen mine tour.