The Tombstone District sits astride a regional NE trending structure. This structure is visible on topographic maps, as well as satellite images of the American Southwest. It is a northeast trending rift structure or shear, traceable from southwest of the Huachuca Mountains of Arizona northeast to Silver City, New Mexico.
The majority of veins and mineralized structures within the Tombstone District and neighboring districts exhibit the same northeast alignment as the above noted structure. In neighboring districts along the NE rift, silver and gold mineralization occur in igneous and sedimentary rocks. This suggesting ore mineralization is pervasive and of considerable extent along this northeast trending regional rift.
This structural trend of mineralization presents an exploration potential of tremendous magnitude, with precious metals and base metals distributed along and adjacent to the structure.
Geologic evaluation of ore-bearing structures within the Tombstone basin suggest that mineralization similar to that historically mined could support an open pit heap leach operation, such as that conducted by Tombstone Exploration, Inc., circa 1980 to 1985.
Mesothermal replacement deposits primarily of silver, gold, zinc and lead are in the upper Paleozoic section, and copper in the lower Paleozoic section below Tombstone, are thought to continue at depth.
Copper replacement deposits in The Abrigo and Martin Formations, as seen at Bisbee, may be similar to those suspected beneath the West Tombstone/Charleston areas.
Multiple porphyry copper centers are known to occur elsewhere associated with Laramide-age granodiorite and quartz monzonite plutons. One such center, confirmed by deep drilling by ASARCO in 1973-74, occurs near the Robbers Roost, on Company property, where intense argillic alteration and mineralized breccia pipe emplacement are exposed by erosion.
Surface examination of the West Tombstone area reveals there are numerous veins and structures that have not been mined or explored. The close proximity of many of these structures and veins may allow for slot or open pit mining methods, if sufficiently high silver-gold values are carried between.
The high degree of vein wall rock alteration indicates the silver and gold mineralization should extend away from the veins into the wall rocks. Most of the veins observed appear to be fissure fillings within fractured intrusive dikes and sills. Aplite and Andesite porphyry dike rocks appear in fissure veins of the West Tombstone-Solstice area.
Skarn mineralization appears to underlie a portion of the project area. Observed locally, the Skarn mineralization appears to be contained beneath a series of low angle or thrust faults, as seen on the face of the Ground Hog Hill and constituting the Limestone-volcanic contact at the western end of the Carbonate patented lode claim.
The most prominent structures are veins occupying N-NE trending fault zones and shears. Ore appears to have been mined where highly manganiferous vein material is present in the NE structures.
In the west portions of the property, the limestone is altered into rocks typically identified with Carlin-Type Gold deposits. The limestone is intensely silicified and is locally jasperoidal.
This intense alteration was observed to occur in the footwall of a low angle, reverse fault. This is a typical location for the deposition of Carlin-type mineralization, as ore bearing fluids tend to pond or be trapped beneath impermeable rocks or clays associated with these faults.