Millard County, UT
Commodities: Gold, Silver and Copper
Development to date: Geologic mapping, sampling and assaying, stable isotope studies, historical and geological compilation, drilling, ASTER and Landsat 7 ETM+ spectral imaging, ground based spectral imaging, isostactic anomaly, bouguer anomaly, aeromagnetic, uranium, thorium and potassium data.
BoreSight Mineral LLC’s Drum Mountain property is located 25 miles northwest of Delta, Utah in Millard County and lies within the boundaries of the Detroit Mining District. Our claims are named Champion Reef and Raddatz-Lovering which encompass 3,104 acres
- Gold and copper were discovered in the Drum Mountains in 1872. The ores were produced from fault-controlled fissures and replacement deposits in limestone and dolomite.
- The Drum Mine, discovered by Nevada Resources and operated by Western States Minerals during the 1980’s, is 1.75 kilometers (1.09 miles) east of our Champion Reef and Raddatz-Lovering properties. The Drum Mine produced 120,000 ounces (3.73 metric tons) of gold from hydrothermally altered igneous rocks, pebble dikes, Cambrian shale and limestone. Approximately 265,000 ounces of a drilled gold resource remain at the Drum Mine. The geologic structures responsible for the gold mineralization at the Drum Mine are an eastward continuation of ore controls which originate and propagate from BoreSight’s property.
- The major structural elements of the Drum Mountain area are the massive Thomas-Keg caldera, fault swarms which trend northeast, east-west and northwest, and east-west directed strike-slip faults cross-cut the westward-dipping Drum Mountain homocline. Cambrian sedimentary rocks at the north end of the Drum Mountains lie along the arcuate Joy fault and are juxtaposed against the southern margin of the Eocene-Oligocene Thomas-Keg Caldera. The Drum Mountain homocline is made up of a thick (6,000 feet+) sequence of Cambrian quartzite overlain by 3,000 feet of Cambrian limestone, shale and dolomite. The stratigraphy was brought to its present repose during the last 17 million years by extensional forces during the Basin and Range Orogeny. The Thomas Caldera is a massive Eocene-Oligocene igneous center. The Drum Mountains and Thomas Caldera area host many fossil hydrothermal systems.
- The gold mineralization in the Drum Mountains is related to distinct magmatic events which occurred during the late Eocene and early Oligocene Epoch (40-34 mya). Famous ore deposits associated with this time-space tectonic-magmatic event(s) are the world-class mining districts of Bingham, Park City and Tintic, Utah, and Carlin, Nevada, to name a few.
- A stable isotope study was conducted on the gold-bearing jasperoid which shows the economic implications relative to the probable occurrence of additional large quantities at depth. The relative depletion of deuterium and oxygen in the quartz and carbonates indicate the participation of large quantities of hydrothermal fluids attributed to the formation of these gold jasperoid bodies. Near zero delta values of carbon imply a sedimentary source but allow for a minor component of magmatic carbon whereas almost zero delta sulfur values strongly suggest the source of pyrite is from a magmatic source. Fluid inclusion studies establish a hypogene origin for the jasperoid and the probable occurrence of large quantities of gold-bearing jasperoid at depth.1
- Three styles of gold mineralization have been identified at the BoreSight Minerals LLC Drum Mountain gold project. The three styles include; gold-bearing jasperoid, sulfide replacement and vein. The gold mineralization is likely linked to the shallowly emplaced Mount Laird group of calc-alkaline intrusive rocks. This epizonal intrusive type of gold occurrence was not recognized by the mining industry until the early 1980’s and was exploited at the Drum Mine in the 1980’s and 1990’s.
- On the BoreSight Minerals property, volcanic hosted argillic and quartz-sericite alteration are associated with a strong negative aeromagnetic response. This geophysical element correlates well with intense magnetite-destructive hydrothermal alteration. When combined with stable sulfur isotope values near zero, a possible genetic link to porphyry style gold-copper mineralization begins to emerge and is suggested at depth. Other supporting clues include; Au-Cu association, distinct ore mineral zonation and alteration assemblages that would be expected with the entrainment of a magmatic hydrothermal contribution to a ground water dominated hydrothermal system. Epithermal gold deposits related to porphyry style mineralization are among the world’s major repositories of Cu, Au, and they remain one of the most sought after targets for the global mineral exploration and mining industry.
- No fewer than seven large gold-bearing jasperoid masses crop out on our Champion Reef claims. An underground study was conducted by BoreSight Minerals in an adit on Champion Reef Claim #10 which revealed that only 20% of the gold-bearing jasperoid at this site is exposed on the surface with the balance of gold-bearing jasperoid remaining hidden below a capping of alteration clays and dolomitized limestone. Jasperoid surface exposures range in size from 575 X 120 feet to 314 X 226 feet and zones of outcrops measure in much larger dimensions. This occurrence of jasperoid is likely the result of upward leakage along a north-west fault system from deeper mineralization.
- From 1962 to 1969, the USGS conducted a geochemical survey of the gold-bearing jasperoid in the Drum Mountains. The survey found gold values ranging from 0.005 to 2.94 ounces of gold per ton in the jasperoid studied. The total average gold value from all the areas surveyed was 0.080 ounces per ton (2.6 grams per ton). The USGS stated in their report that at the 1969 price of gold ($35 per ounce) the size and tenor of several of the jasperoid masses could constitute an economically viable ore.2
The gold content within the jasperoid appears to increase with depth. BoreSight Minerals LLC’s surface rock chip sample values range from 0.005 to 0.052 ounces of gold per ton. Samples taken 15 feet below the surface range from 0.132 to 0.223 ounces of gold per ton with little variance. The physical appearance of the rock has little bearing on the gold values as the gold is microscopic and is not visible to the naked eye.
Tooele County, Utah
Commodities: Gold, silver, copper, lead and zinc.
Development to date: Geologic mapping in progress, reconnaissance assays, historical and geological compilation, ASTER and Landsat 7ETM+ spectral imaging, isotactic anomaly, bouguer anomaly, uranium, thorium and potassium data.
BoreSight Minerals LLC’s Castle Mountain property is located 20 miles north of the Drum Mountains in Tooele County.
The Castle Mountain property is a “green field” prospect located 40 kilometers (20 miles) north of the Drum Mountains in Tooele County, Utah. The property was discovered by Matthew Ure in July 2011 and represented by an erosional window into an un-prospected Carbonate-base metal-Au, Ag deposit which is likely telescoped onto deeper polymetallic and porphyry mineralization. Gossans, veins and “float” ore occur along NE and NW trending faults and share a spatial relationship to advanced argillic alteration, dolitimization and intense silicification. Numerous altered and structurally controlled porphyritic dikes of intermediate and basaltic chemistry intrude NE and N-S faults and converge near a large breccia diatreme indicating repeated intrusion and a potential porphyry type deposit at depth.
Commodity: Silver, lead and zinc.
Development to date: Geologic mapping, reconnaissance assays, ASTER, Landsat 7ETM+ and AVIRIS spectral imaging, isotactic anomaly, bouguer anomaly, aeromagnetic, uranium, thorium and potassium data.
The Apex-Tenmile property is located 13 kilometers (8 miles) south-west of the town of Fairfield Utah and 22 kilometers (14 miles) north from the town of Eureka Utah. This is a prospect with potential as a deep target. Gossan leakage along shear structures in the center of the property indicates the presence of primary sulfides at depth. Several anomalous gold assays have also been found along the shear structure. An AVIRIS spectral survey reveals a broad propylitic alteration field affecting the carbonate and sandstone rocks of the area.
 O’Neil, J. R. and Bailey, G. B., July 1979, Stable Isotope Investigation of Gold-Bearing Jasperoid in the Central Drum Mountains, Utah, Society of Economic Geologists, American Geological Institute Abstract.
2] McCarthy, Jr., J. H., R. E. Learned, J. M. Botbol, T. G. Lovering, J. R. Waterson, and R. L. Turner, 1969, Gold-Bearing Jasperoid in the Drum Mountains Juab and Millard Counties, Utah, U. S. Geological Survey, Geological Survey Circular 623.