Abstract
This one-day field trip visits the Cripple Creek Mining District, a world-class district by any definition (ounces produced, dollars generated, publications authored, etc.). The district, located 20 air miles (32 km) west of Colorado Springs, Colorado, has produced over 24 million ounces of gold (750 tonnes) since its discovery in 1891. Current reserves (year end 2013) stand at 4.7 million contained ounces (146 tonnes) and exploration efforts continue to search for additional resources. The bulk of the gold mineralization has been produced from narrow, high-grade veins hosted in an Oligocene, alkaline, diatreme-intrusive complex. Gold has also been produced from mineralization hosted by the Precambrian rocks where the vein systems were strong enough to penetrate from the diatreme. More recently, gold has been produced by bulk mining methods in the low-grade haloes around the vein systems. A road log and two reprinted articles are included.
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