 The mine has operated on and off until it closed for good in the early 20th century.Traces of the Black Star mining operation can still be found, including rusted mining equipment, abandoned shafts, and piles of low-grade coal scattered about the floor of the canyon (similar to those found in Fremont Canyon to the north).In the early 1920s, the United States Forest Service built a narrow but well-graded road up Black Star Canyon and down the eastern slope of the mountains to Corona, thus opening the ranchlands of the upper canyon to hikers.