Locked steel gates like this one have been installed over all of the old mine entrances in the past few years. Prior to that time it was not unusal to come across local spelunkers going into the old shafts, which I was told were mostly in good condition. One group of college kids once asked me to identify some minerals they had seen. From the description I could only conclude that quartz crystals of several inches long remain behind in the old workings. I only wish I had the access, equipment and knowledge to explore them safely. I know enough not to venture into old mines without proper preparation. For now I prefer to work above ground.