Didn't have a lot of time to get out this weekend so we thought we would check out lower Bark Canyon to locate the mine/tunnel. Like the description reads, this is a great close-in hike. We entered off the Dutchman trail and hiked a little past where the Bluff Spring trail crosses, had a bite to eat, then returned the same way (I like to hike new areas in both directions to really take it in). The mine/tunnel really had a "urine" like smell and there were droppings near the front so we made the decision not to go in and possibly "surprise" anything that might be calling this shelter home