Mineralization is hosted in the Triassic Star Peak Group, a 1,220 m thick section of marine platform limestone with lesser conglomerate, sandstone, and dolostone (Johnston 2008). Four formations comprise the Star Peak Group. In ascending order they are: the Dixie Valley, Favret, Augusta Mountain, and Cane Spring Formations. Most of the historic production came from the Augusta Mountain Formation.
Recent exploration drilling by Premier has led to discovery of the 2201 Zone, hosted within the Dixie Valley conglomerate beneath the Cove pit. The 2201 Zone is similar to the polymetallic sulfide veins that produced gold and silver from the Cove pit. The gold and silver within the 2201 Zone is hosted in both stratabound and high-grade quartz and polymetallic sulfide veins that appear to be smaller imbricate thrust faults refracting upward from the Cove thrust.
With the consolidation of McCoy-Cove, a trident of known deposit types exist on the property, including skarn, distal disseminated polymetallic sulfide, and distal Carlin-style carbonate replacement opportunities. Deeper high-grade gold/silver target areas exist between the McCoy and Cove open pits along known feeder fault structures. IP Resistivity geophysics is being used to aid in defining sulfide concentrations and rock alteration at depth. High-grade gold mineralization is also known to exist in the Panther Canyon conglomerate down-dip along the Gold Dome intrusive fault structure at the McCoy pit area. This high-grade mineralization is undrilled at depth and represents one of the highest quality deep targets.