Mineral Hill, Wyoming

Mineral Hill is located in the alkaline intrusive complex of eastern Wyoming and western South Dakota. The project area, located on the eastern Wyoming border, is 25 kilometers west of the Homestake Mine and 20 kilometers west-northwest of Goldcorp’s Wharf Mine. 

EMX is targeting epithermal gold and porphyry copper-gold mineralization associated with an Eocene-age, alkaline intrusive complex consisting of an outer ring complex, interior intrusive complex, and interior breccia zone.Exposed mineralization in the district, combined with historic production from high-grade veins, provides evidence for multiple magmatic events, including the emplacement of a prominent central breccia pipe. Placer gold deposits are broadly developed in and around the Mineral Hill intrusive complex. Reconnaissance drilling has intercepted porphyry-style copper-gold mineralization in an area of stockwork  K-silicate and quartz-sulfide veins on EMX’s property.

Mineral Hill is held under a pooling agreement with a private group, Mineral Hill L.P. (“MHL”), with all proceeds split 50:50, except for the sale of surface rights associated with several patented mining claims. 

*Nearby mines and deposits provide context for the project, but do not necessarily indicate similar size, styles or grade of mineralization within the project.


Geological map of Mineral Hill split between South Dakota and Wyoming. Click to Enlarge


Styles of mineralization encountered in drilling. Shown are quartz-limonite-chalcopyrite (porphyry-style) veins cut by vuggy quartz-limonite veins (epithermal-style) intersected in drill hole IO-1. Click to Enlarge
Example of higher grade vein structures from Trench 2 in the 3 Mines Ridge area. The vein consists of vuggy quartz and oxidized pyrite and is cutting K-feldspar-pyrite altered breccia. Click to Enlarge