Black Star Canyon Adventure Professional Review and Guide
"The Black Star Canyon Adventure is, as the name implies, an adventurous 16.65mile mountain bike ride in the Santa Ana Mountains of northeastern Orange County. The net elevation gain of the out-and-back ride is 2,004 feet, in 8 miles. The return trip features a rapid descent. Black Star Canyon has a rich history and folklore; the canyon and surrounding lands have multiple layers of preservation, including the Irvine Ranch National Natural Landmarks, Cleveland National Forest, the Wildlands Conservancy (through the Mariposa Reserve), and some private land ownership.
Artifacts from the era of the ancient Tongva-Gabrielino peoples have been found in the canyon. Mining operations in the canyon area started during the early 19th century, and continued well into the 20th before ceasing. Some old mining equipment, infrastructure, and shafts can still be seen."