105.1A is a hiking, biking, and horse trail in Gilpin County, Colorado. It is within Roosevelt National Forest. It is 0.3 miles long and begins at 9,081 feet altitude. Traveling the entire trail is 0.5 miles with a total elevation gain of 137 feet. The Tacoma Tunnel Mine (elevation 9,108 feet) quarry can be seen along the trail.
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