[13] The ore is in altered and brecciated volcanic and volcanoclastic rocks of Oligocene age and predominantly quartz latite composition.

Gold mining in the district began in the 1890s, mostly as underground operations, chasing high grade veins.

Warren, Harry & Frank Woods entered the Victor mining scene in when they purchased the Mount Rosa Placer and incorporated the Mt.

[16] Most of the Cripple Creek properties were consolidated into the Golden Cycle Mining and Reduction Company, and the Carlton Tunnel was completed in 1941.

[17]: 110–111, 113 The Cripple Creek and Victor Narrow Gauge Railroad was opened in 1967 and continues to serve as a tourist attraction.

AngloGold merged with junior partner Golden Cycle Gold Corporation in 2008 and thereby acquired the remaining 33% of the project.

[10][19] The mine is a low-cost, low-yield open pit operation, with grades well below one gram of gold per tonne of ore.

[17]: 78–80 Two "Aladdin's caves of gold" were discovered in August 1953, on the 3100 foot level of Ajax Mine, Battle Mountain.