Yerington West, Arizona

Yerington West is a porphyry copper project located in the Yerington Mining District of western Nevada and is being advanced by Hudbay Minerals (formerly held by Entrée Gold). Historic Anaconda work from the 1960-1980s produced a highly-constrained structural and geologic framework, highlighting untested targets throughout the district. Much of the district remains covered by post-mineral sedimentary and volcanic units. EMX is targeting a concealed porphyry center related to an exposed dike swarm with associated skarn mineralization.

Tertiary faults have significantly dismembered and extended the district, which contains a cluster of porphyry Cu (Mo) systems centered on a Jurassic granitic pluton. Fault-bound deposit pieces include the past-producing Yerington and McArthur mines (Anaconda), and the undeveloped Bear-Lagomarsino and Ann Mason deposits, in addition to several IOCG-type targets such as Pumpkin Hollow (Nevada Copper).

Drilling by partner Entrée Gold on the EMX property intersected high-temperature porphyry-related alteration and mineralization, consistent with a distal porphyry-related signature.

Yerington West is under option to Entrée Gold, where Entrée can earn up to an 80% interest in the project by completing a feasibility study by October 2019, and by completing yearly minimum work commitments or making Advanced Production Payments. Once Entrée has earned into the project, EMX can convert its interest to a 2.5% NSR. Entrée has the option to purchase 1.5% of the NSR for US$4.5M.

In May 2017 Entrée Gold spun-out its U.S. assets including the Ann Mason project and Yerington West project into Mason Resources. Hudbay Minerals has since acquired Mason Resources in December 2018

Note: The nearby mines and deposits in the region provide context for EMX’s Project, which occurs in a similar geologic setting, but this is not necessarily indicative that the project hosts similar mineralization.


East-west cross section (looking north) redrafted from Proffett and Dilles (1984) with dismembered southern porphyry center projected onto the section from the north Click to Enlarge
Geological map of Yerington West and target area. Click to Enlarge