Precious Metal Carbonate-hosted, “Manto and chimney” style polymetallic deposit with assays up to 16.05 g/t Au, 957 g/t Ag, 0.3% Cu, 4.9% Pb, 7.9% Zn.
Commodities: Au-Ag-Pb-Zn-Cu
Location: Sonora, Mexico
Size: 2260 ha
Status: Available for Option
LA UNION PROJECT OVERVIEW
La Union Project is located 50 km southwest of Caborca along the western edge of the Sonoran Gold belt, host to multiple million-ounces gold deposits such as the La Herradura Mine at 10.2 Moz Au[1] and the San Francisco Mine producing 1.5 Moz Au (M+I)[2].
Mineralization at La Union Project is preferentially hosted in dolomite beds near contact with sandstones and quartzite. The main locus is a north-northeast corridor approximately 6 x 3 km in extent. Within this zone polymetallic replacement deposits occur as discrete, pipe-like bodies and faults breccias closely related to thrust faults imbrication. Historical results returned values up to 16.05 g/t Au and up to 957 g/t Ag. The north-northeastern structural corridor is also host of two historical mines operated during the 1950s: La Union Mine and La Famosa. La Union Mine reported to be the biggest producing polymetallic oxides ore, averaging 7-20 g/t Au, 300 g/t Ag, 10-20% Pb and 5% Zn (Yantis, 1957).
Analog deposit is the world class
polymetallic deposit of Leadville District in Colorado, which produced 3 Moz
Au, 260 Moz Ag (plus Pb-Zn-Cu) out of only 24 Mt ore (Laughlin, 1926). Further
district scale zonation of base and precious metals could lead to intrusive
activity but have not yet been demonstrated at La Union.
[1] http://www.fresnilloplc.com/what-we-do/mines-in-operation/herradura/
[2] https://www.aliogold.com/assets/Operations/san-francisco-mine/default.aspx
