La Unión Gold-Silver-Copper-Lead-Zinc Polymetallic Project

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 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.





Precious Metal Carbonate-Hosted "Manto and Chimney"-Style Polymetallic Deposit

Type of Deposit

Sonora, Mexico


2,260 Ha.

Surface Area


  • Go To Location



This new application brings the paper map online.

Up to date information of:

  • Resources.
  • Production.
  • Endowment.
  • Technical Reports.
  • Geology.
  • And More…

Check the Mining State Panoramas

The promotion and dissemination as essential elements to understand and disseminate our Mineral resources, that is why today it is pleased to make the document “Mining Panorama” available to society, by state.

Get to know GeoInfoMex in 3D

GeoInfoMex, is the consultation system of the Mexican Geological Service that allows users to know geoscientific information and make decisions with savings in time and resources, helping to promote mining activity.


México Minero is a non-governmental organization that promotes sustainable mining.

The DOF is the organ of the Constitutional Government of the United Mexican States, which has the function of publishing in the national territory, to so that they are properly observed and applied in their respective areas of competence.

Learn about the current situation of the mining industry as well as the activities carried out by Camimex.

Mexico Mining Center © 2019 / All Rights Reserved