Seventy-Six shaft, Willow Creek Mining District, Gunnison County, Colorado, USAi

Regional Level Types
Seventy-Six shaft	Group of Shafts
Willow Creek Mining District	Mining District
Gunnison County	County
Colorado	State
USA	Country

Commodities (Major) - Gold, Iron, Zinc, Silver, Lead
Commodities (Minor) - Titanium, Thorium, Uranium
Development Status: Exploration, Under Claim 01/OCT/2012

Three distinct 4-10 foot wide, alternating Fe, Pb, and Fe sulfide veins, all with Au-Ag mineralization, run parallel within the claim with another sulfide vein parallel 150 meters North. Two additional veins run parallel 300 meters South. A perpendicular vein occurs on the East side of CO-149 approximately 250 meters East. All three major veins on the property are bisected by CO-149 at shallow depth, 3-10 feet. Mineralization is Tertiary igneous and metamorphic with the three mineralized veins all breaching the surface from the East side of CO-149 to the West side where they enter a hill still parallel with mineralization at 4-5 feet, rapidly becoming deeper as the veins intersect the bottom of the hill at 200 feet below surface material which is Tertiary and younger, comprised of igneous, metamorphic, and of sedimentary material. All three rock types are found within the claim and shaft sunk 25 feet with vein exposure at ground level to 5 feet and shaft still within consistently significant FeS-FeO mineralization at 25 feet at which point Pb levels drop off by approximately 10.8% per 7.5 feet (+/-1%) as a ratio to other concentrated ores, but all other commodities listed remain more or less constant in ratio per ton with the exception of Au and Ag, which increase in ratio to Fe, Pb, Zn, Ti, Th and U progressively as vein is followed to current depth with final depth unknown but estimated at 280 feet. Au in this deposit is significant at greater depth which means this deposit may have been mineralized in the Cambrian and re-mineralized again at 28-32 Ma, explaining the unusual banding in deposit and varying levels of ores with only minor consistency. Mineralization here is more significant than all other shallow prospects and known veins/pegmatites within the area and note a financially significant amount of minor commodities on this property. Both Au and Ag are sequestered in mineralization, host rock, and extremely fine in this deposit almost as if this was a Carlin Trend Type Deposit and Au levels can only be determined by crush and flotation methods. SiO2 in this tri-vein deposit does not show any Au mineralization to the eye at 10x, but crushed ore reveals a financially significant deposit of both Au and Ag with sporadic, mildly significant REE deposition in both Tertiary igneous and metamorphosed material.

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References