United States, California, Butte, Humbug Rd. between the Skyway and the road to Philbrook Reservoir, near Memorial Spring just ne of Chaparral Guard Station. T25N R04E S10 SE1/4 of NW1/4
40.040833 -121.516111 +-805m. NAD83
T25N R04E S10 SE1/4 of NW1/4; 40§ 2m 27s N; 121§ 30m 58s W