La Trinidad


The La Trinidad mine was reported to have been one of the highest-grade open-pit, heap leach gold mines in Mexico until it’s closure in 2019. GR Silver Mining completed the acquisition of this project, along with a highly prospective portfolio of 12 mining concessions, in March 2021.

Project Summary

La Trinidad was reported to have been one of the highest-grade open-pit, heap leach gold mines in Mexico until it’s closure in 2019.

On April 1, 2021, GR Silver Mining acquired 100% of Marlin Gold Mining Ltd. (“Marlin”). Marlin owns 100% of Oro Gold de Mexico, S.A. de C.V. (“Oro Gold”) a Mexican company, that owns the La Trinidad gold mine (“La Trinidad”), and 12 highly prospective concessions totalling 107,392.5 ha located adjacent to GR Silver’s existing portfolio of properties. This gives the Company control of 75 km of prospective trend with known mineralization including three zones and over 24 shallow gold-silver old workings, which are strategically located in the historic Rosario Mining District, Sinaloa, Mexico, on the western edge of the prolific Sierra Madre Occidental gold-silver belt.

The La Trinidad mine is located 90 km SE of Mazatlan and 27 km ESE of Rosario. The property is accessed by way of a paved road from Mazatlan to Rosario and then a 42 km all-weather gravel road. The property is comprised of four contiguous concessions totaling 46,749 ha. La Trinidad includes infrastructure such as a high voltage power line (connected to the Mexican Regional Power grid), offices, shops, 80-man camp, infirmary, warehouses, foundations for a processing plant, Taunus open-pit (currently under reclamation), leach pads containing 1.5 Mt of processed oxide ore and other key infrastructure which can be fundamental for future project development.

Gold mineralization at the Taunus Pit occurs in intensely silicified tectonic and quartz matrix hydrothermal breccias, hosted in volcanic rocks. The mineralization is reported to be associated with a gold-rich, intermediate sulfidation epithermal system.

Oro Gold acquired the La Trinidad property from Minera Camargo S.A. de C.V. in 2005 and subsequently commenced drilling and regional exploration. The property had been previously owned and operated by a subsidiary of Eldorado Gold Corp. (“Eldorado”). Based on Eldorado’s annual reports, production from the Taunus Pit commenced in 1996 and ended in 1998. A second zone, below what was mined by Eldorado, was discovered by Oro Gold in 2009 and is located approximately 30 m below the Eldorado zone or approximately 150 m below surface. The discovery of this deeper zone was the basis for the NI 43-101 preliminary economic assessment that Marlin filed on SEDAR on June 11, 2012. In 2014, Marlin achieved commercial production of a heap leach, open pit operation at La Trinidad, one of the highest-grade, open-pit heap leach gold mines in Mexico. While Marlin focused primarily on advancing production at the Taunus Pit, today the remainder of the La Trinidad land package and the surrounding area presents an opportunity for cost-effective exploration and potential discovery of new silver and gold mineralized zones.