34° 35' 33.6" N 117° 38' 43.1" W 3318' (WGS84) (Google Maps)
34° 35' 35.6" N 117° 38' 46.9" W (WGS84) (Google Maps)

Bureau of Land Management

The geology of Black Mountain is pretty crazy. These coordinates are for garnet tactite outcrops on the west side of the mountain. The north end of the mountain is also worth exploring, as there are supposed to be some very curious mineral occurrences around there that I have not yet visited.

Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, California (USGS)

Geologic Map of the Shadow Mountains & Victorville 15 minute quadrangles, San Bernardino & Los Angeles Counties, California (Dibblee Foundation)