Lomitas Negras, Arizona

The Lomitas Negras property is ringed by Laramide-age intrusive rocks and porphyry copper/skarn deposits that include San Manuel-Kalamazoo (~20 kilometers north), Copper Creek (~25 kilometers northeast), and Oracle Ridge (~10 kilometers southwest).  Nearby outcrops exhibit alteration and anomalous base metal mineralization that characteristically occurs on the margins of porphyry copper systems. EMX’s recognition of the altered outcrops, combined with a new interpretation of the extensional structural setting of the area, led to the identification of concealed porphyry copper targets beneath the post-mineralization pediment cover at Lomitas Negras.   

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.


Geological map of area surrounding Lomitas Negras project. Click to Enlarge


Mineralization in the altered Escabrosa limestone on the Lomitas Negras project. Clockwise from upper left: Cu-oxide and wulfenite (Mo); galena and wulfenite; chalcocite, wulfenite and Cu-oxide. Click to Enlarge