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IMC International

Bullard Pass


The Bullard Pass Property is located within the Pierce Mining District in southern Yavapai County, Arizona and lies along the Bullard detachment fault in the Bullard Mining District at the southern end of Harcuvar metamorphic core complex. The Bullard detachment fault is a portion of the regional Buckskin-Rawhide-Bullard detachment fault in west central Arizona, striking approximately N55-60E and with a moderate dip to the south. While most of the property is covered by Quaternary alluvium, the limited exposures in the low hills indicate the hanging wall of the fault is comprised largely of Tertiary volcanic and sedimentary rocks, while the footwall is comprised largely of mylonitized granitoids or granitic gneisses of early Proterozoic and Cretaceous age.

Property Access


Previous modern exploration work on the current Bullard Pass Property consisted of geological mapping, geochemical sampling, geophysical surveys, and a number of Reverse Circulation drill holes. Most of the exploration centered on the patented claims and on extensions of mineralized structures from the patented claims into the unpatented claims and state section It is unknown if any resource or reserve was calculated in the modern era on the observed mineralization located on the state section or the unpatented claims. District production totals were 614,000 pounds of copper, 3,600 ounces of gold, and 15,000 ounces of silver from 17,000 tons mined that occurred between 1933 and 1956 (Keith and others, 1983). Spencer and Reynolds (1992) report that 90% of the production in the Bullard District was from the Bullard Mine located on the neighboring patented claim block.

Local & Regional Geography

The Bullard (Pierce) mining district is located on the southern edge of the Harcuvar metamorphic core complex (Spencer and Reynolds, 1992) (Figure 6). The Harcuvar metamorphic core complex is associated with Tertiary zone of extension in a north-south zone in the western United States. This tectonic framework is present in western and west-central Arizona. Two sequences of rock separated by a detachment fault characterize this tectonic environment. Lower plate rocks (below the detachment fault) are generally composed of variably mylonitized crystalline rocks ranging from Proterozoic to Mesozoic in age. Above the detachment fault (upper plate rocks) are usually composed of severely tilted Tertiary volcanic and sedimentary rocks plus basement rocks, locally. The Bullard detachment fault is a portion of the regional BuckskinRawhide-Bullard detachment fault in west central Arizona (Figure 6). The Bullard detachment fault strikes approximately N55-60E and with a moderate dip to the south. Minor mylonitic foliation within the fault zone has dips ranging from approximately 30 o to vertical averaging approximately 60 o south, as reported in various previous property reports.


Small shear zones host quartz and quartz-calcite veins and fracture fillings. In the Bullard district Spencer and Reynolds (1992) report that copper minerals associated with veining are predominantly chrysocolla and brochantite with less abundant malachite and chalcopyrite. Native gold is associated with iron oxides. Roddy and others (1988) indicate that gangue minerals are earthy and specular hematite, pyrite, quartz and calcite with minor barite and fluorite. Fluid inclusion studies and oxygen isotope analyses indicate that the mineralization is derived from basinal brines with minimum temperatures ranging from 230 to 310oC (Roddy and others, 1988).
In shear zones iron oxyhydroxide and copper oxide minerals are present with gouge, indeterminate clay minerals, and sporadic calcite. Locally, silicification may be present. Roddy and others (1988) indicate that the host rocks were regionally altered by potassium metasomatism.


Between February 2007 and June 2008 an orientation survey was conducted on the Bullard Pass Property. This study included geological mapping to determine the reliability of previous work, lithogeochemical sampling to determine if precious and base metal mineralization existed within veins and to guide the interpretation of the soil geochemical samples, and a VLF-EM analysis to determine if geophysical modeling of conductor locations in the past is reliable. The results of the orientation survey were positive in that the lithogeochemical samples collected in the North Hill area just within the patented claims (Appendix 2) and the soil geochemical results indicated that mineralization exists within shear zones on the property and that blind and hidden mineralization could be detected on the property. Lithogeochemical samples collected from veins and shear zones on the Bullard Pass property during 2007 and 2008 are summarized in Appendix 3. Average chip samples across the strike of the mineralized structures ranged from less than detection (5 ppb) to 1700 ppb (1.7 g/t or ppm).

Samples E-501 (2965 ppb or 2.9 g/t), and E-502 (5ppb or 0.005g/t) were average chip samples 50 feet apart on the same Unity vein, but could not be sampled perpendicular to the strike of the vein. However the results indicate the extreme variability in mineralization encountered along the strike of the small tight veins. Samples E-512 and E-514 were average dump samples. E- 513 was an average ore stockpile on the patented claims and is not reported here. Based on these results the unpatented claims were staked and the Arizona state mineral rights were acquired. The Phase One soil geochemical survey on a 120 meter (400 foot) grid covered most of the mineral rights acquired by IMC International Mining Corp. on the property. Numerous anomalous areas were identified, and three of the anomalous areas were selected for a 60 meter (200 foot) Phase two soil sampling program. The results in each of the three 60 meter grid areas were positive with large anomalous areas identified. A five thousand foot drill program was designed to test portions of each of the anomalies to determine the depth to the detachment fault and if disseminated mineralization is present at depth.

Ahyiresso Concession