Located approximately 120 kilometers south of Chihuahua City in the heart of Mexico’s silver belt, the Los Gatos District consists of 14 mineralized zones to date, including three identified silver-lead-zinc deposits: the Cerro Los Gatos Mine, the Esther deposit, and the Amapola deposit. The other 11 mineralized zones, with over 150 kilometers of outcropping quartz and calcite veins, have at least one mineralization intercept. The area is characterized by a predominant silver-lead-zinc epithermal mineralization.

Prior to the initial acquisition of concession rights in April 2006, very limited historical prospecting and exploration had been conducted in the Los Gatos District. However, we were able to acquire concessions and access rights covering approximately 103,000 hectares and soon discovered a virgin silver and zinc region containing multiple zones of high-grade epithermal vein-style mineralization throughout the Los Gatos District concession package.

To date, our focus in the Los Gatos District has been: 

  • constructing and commissioning the Cerro Los Gatos Mine
  • defining and expanding the mineral resources associated with the Cerro Los Gatos Mine, the Esther deposit, and the Amapola deposit. 

The Cerro Los Gatos Mine is our first commercially producing mine in the Los Gatos District. Our lead and zinc concentrate shipments commenced in September 2019, achieving commercial production levels by the end of 2019. We plan to continue to sell our concentrate material, containing zinc, lead, silver, and gold metals, to smelting facilities in Japan, Mexico, and other locations through intermediaries. 

We believe there is widespread mineral resource potential beyond the Cerro Los Gatos Mine, the Esther and Amapola deposits, and the 11 other mineralized zones, as more than 85% of the land position has yet to be drilled. As a result, the Los Gatos District remains highly prospective and underexplored.

Elsewhere in the Los Gatos District, the Esther and Amapola zones are emerging as future deposits.
  • The Esther deposit contains 0.46 million tonnes of indicated resources at average grades of 133 g/t silver, 0.04 g/t gold, 0.02% copper, 0.7% lead, and 2.1% zinc and 2.29 million tonnes of inferred resources at average grades of 98 g/t silver, 0.12 g/t gold, 0.05% copper, 1.6% lead, and 3% zinc.
  • The Amapola deposit contains 0.25 million tonnes of indicated resources at average grades of 135 g/t silver, 0.1 g/t gold, 0.02% copper, 0.1% lead, and 0.3% zinc and 3.44 million tonnes of inferred resources at average grades of 140 g/t silver, 0.1 g/t gold, 0.03% copper, 0.2% lead, and 0.3% zinc.

Cerro Los Gatos Is already yielding returns.


Concentrate shipments commenced in September 2019 with commercial production achieved by the end of 2019.

Rare Greenfield Discovery

We discovered a virgin silver region containing high-grade epithermal vein-style mineralization throughout the Los Gatos District concession package.

District-scale potential

Despite being located in the “silver belt” of Mexico, more than 85% of the land position has yet to be drilled. As a result, the highly prospective Los Gatos District remains underexplored.

Low Risk

Mining-friendly jurisdiction with low regulatory risk. Close to existing surfaced roads, access to grid power, ample water supply, and local community support.

Cerro Los Gatos Senior Management

Mark Tilley brings nearly 25 years of U.S. and international development, operating, and construction experience to GSI. Most recently, Mr. Tilley served as the Engineering Superintendent for Cementation at the Los Gatos Project in Chihuahua, Mexico. Previously, Mr. Tilley was involved in the startups of the Kennecott Bingham Canyon Mine Underground Projects and the Lundin Eagle Mine Phase 2 Development. He then transitioned to Business Development and onsite training projects in various locations in Mexico. Mr. Tilley began his career at the Magma Copper (which changed ownership to BHP) San Manuel Mine, where he undertook various operations and technical positions and was eventually supervising the underground raise drilling operations. After the San Manuel Mine was closed, Mr. Tilley became the Manager of a small silver project in Bolivia. Mr. Tilley has since held various mining and tunneling positions at various projects in the United States. Mr. Tilley has a Bachelor’s degree in Mining Engineering from the University of Utah, and he is a Professional Engineer.

Enrique Contreras has been a Metallurgist Engineer since 1992 and currently serves as the Process Plant Manager at the Cerro Los Gatos Mine. Mr. Contreras studied and trained as a Mining and Metallurgist Engineer at the Universidad Nacional Autónoma de México. Mr. Contreras had previously worked with Grupo GEOMINERA, ASDR Industries, AGNICO EAGLE, and PEÑOLES Industrial Services, as well as a Mining Research Manager at Industrial Minera Mexico. Mr. Contreras has also served as Manager of Processes Plant in El Boleo Metallurgical Mining, TRAFIGURA, AUTLAN, and FRISCO GROUP.

Jesus Segura brings 20 years of Mexico & Latin America mining and business operations experience to GSI. Mr. Segura joined GSI in 2017 as Project Control Manager at the Cerro Los Gatos Project. Previously, Mr. Segura was Underground Business Manager for Orica México; Management and Project Control Director at the Buritica Project for Continental Gold; Administration and Contract Project Manager at the San Jose Project for Fortuna Silver; and Operations Manager for London Consulting Group in several Latin American countries with considerable experience in coaching and implementation of new management and operational processes. Mr. Segura has a bachelor’s degree in Industrial and Systems Engineering from the ITESM Instituto Tecnológico y de Estudios Superiores de Monterrey.

Emir Toledo has more than 20 years of experience in several important companies and firms like Grupo Bimbo and Grupo Copamex. Mr. Toledo graduated from the Instituto Politécnico Nacional in México City as a Public Accountant, and he is responsible for financial, accounting, and administrative matters in the position of Financial Manager at the Cerro Los Gatos Mine. Mr. Toledo is currently studying for an MBA focused on Finance at Universidad del Valle de México in Chihuahua City.

Los Gatos District is a tremendous opportunity in a favorable mining jurisdiction, and we believe GSI will be discovering new resources and increasing production in this district for decades.