The Ashbrook mining district is located in the Grouse Creek Mountains of extreme northwestern Box Elder County, Utah. The initial prospecting in the district was reportedly done in 1864, the first claim staked in 1873, and the district was organized in 1874. The Ashbrook district saw limited, sporadic production until 1920, when the Vipont mine became a strong silver-gold producer for four years. Erratic production continued from 1924 until the federal precious metal mine closure act of 1941 halted production for the duration of WW II. The district remained basically idle from 1942 until the old mill tailings were reprocessed by heap leaching from 1978 to 1984. Past district production amounts to about 180,000 tons of ore which yielded 3,440,000 ounces of silver (19 oz/t). The Vipont property still hosts an open-pitable mineral resource of approximately 430,000 tons at an average grade of 5.06 oz/t Ag and 0.01 oz/t Au (over 2 million ounces of silver contained) and several suggested exploration targets remain untested.