This is, to me, the "iconic" Quartzville spot. The "Snowstorm" tunnel is supposed one of three, but I've never found the other two. Nor have I looked that hard. But sometime in the last ten years or so, they gated the entrance. If I wanted to, I'm pretty sure I could get through that gap. The warning sign on the wall behind the gate says something about hazardous materials, but unless some idiot was trying out mercury or cyanide extraction, I can't imagine what it would be. My personal suspicion is that it's a pro-active attempt to control white-nose syndrome among bats... I've never noticed any here, but this would be a good winter refuge for them. And whoever controls this land (BLM or Forest Service) might correctly guess that many people don't understand or care enough to respect that issue, decided to go with a scare tactic. Whatever the reason, when this much effort has been put in, I'll pay attention to No Trespassing signs.