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Mesa Well, Arizona

The Mesa Well Project is located in south-central Arizona’s porphyry copper belt, approximately 100 kilometers northeast of Tucson. The project is partnered with Interpid Metals Corp. where the agreement with provides EMX with cash and share payments during Intrepid’s earn-in period, and upon earn-in, a retained 2% net smelter return (“NSR”) royalty interest, annual advance royalty payments, and certain milestone payments.

The Mesa Well Project is covered by State of Arizona exploration leases that were acquired as a result of EMX’s southwestern U.S. porphyry copper royalty generation program. The original target concept was derived from the coincidence of locally anomalous water well geochemisty and an unexplored porphyry dike swarm striking toward those anomalies, with several water wells reporting high molybdenum values and notable ”multiparameter” anomalies.

The Mesa Well target area is covered by highly tilted, post-mineral, Tertiary gravels. Field work to the east of the principal target area identified: 1) a variety of porphyry dikes and associated weak, but broadly-developed biotitic and sodic-calcic alteration with sparse chalcopyrite mineralization and 2) exotic, secondary copper mineralization along a low angle fault zone that spans from the dike swarm to the geochemically anomalous water wells. The dikes, alteration, and mineralization are characteristic of the deeper flanks of a porphyry system. The remobilized copper mineralization is interpreted to be sourced from the porphyry target beneath the post-mineral cover.




Cu-oxide coated fracture surfaces encountered during initial drilling at Mesa Well. Click to Enlarge
Cu-Mo mineralization in quartz veins intersected during the initial drilling program. Click to Enlarge