Black Reef is located in Arizona within the Copper Creek-Bunker Hill Mining District ~20 km NE of the San Manuel Mine and ~ 5 km N of the Copper Creek porphyry.
Precambrian schist (Xp), sedimentary rocks (Ya), diabase, Paleozoic sedimentary rocks (Pz), Laramide volcanic rocks (Kg) and intrusives (Ki) occur to the west of, and project beneath post mineral Tertiary volcanic rocks (Tv) at Black Reef. Windows of Pz rocks project through the Tv just north of the target area.
There are clear geochemical and alteration zoning patterns in surrounding exposed bedrock. The Kg and Ki rocks west of the covered target area host quartz-sericite-pyrite (oxidized) and locally clay alteration, hydrothermally altered breccias, silicification and more distal chlorite-epidote alteration. The Pz carbonate rocks the northwest and north of the target area host base and precious metal-bearing replacements including massive jasperoid bodies and local marbleization and skarn.
Targets at Black Reef include: Cu-Mo porphyry system source of the observed altered and mineralized rocks projecting from beneath post mineral cover (Tv) rocks to the west and north of the target area and, Manto/CRD-style replacements in Pz host rocks that already exhibit more distal manto-style replacements as well as more proximal skarn deposits that are likely to occur closer to the source porphyry center.
The Black Reef project is available for partnership opportunities.
*The nearby mines provide geologic context for EMX’s Project, but this is not necessarily indicative that the Project hosts similar tonnages or grades of mineralization.