Iron Chest Mine is a 5.2 mile out and back trail located near Nathrop, CO and is rated as difficult. The trail is primarily used for hiking and off road driving and is accessible from March until November.
off road driving
The first quarter mile, or more, the trail was just boulders (some big, some small) that required extra time and care while crossing over. The entire hike to the mine was uphill and quite a steady grade (over 1,800' elevation gain), hence the "Demanding" rating. I mean, it is the Colorado mountains, what do you expect, right? Anyway, it's a nice trail and has some scenic views on the way. The mine is interesting and contains some old buildings and mining equipment that were left behind. It appeared that more trail wrapped around to the east and followed the ridge back north; however, I didn't have time to explore that extra route.