The Veta Grande Vein System
The Veta Grande vein system has been estimated to be approximately 16 km long. Concessions owned and operated by Santacruz cover approximately three km of strike length at the northwest end of the vein system. The alteration consists of a 1-5 m narrow and vein-proximal zone of argillic alteration within weak to moderate and pervasive silicification peripheral to the vein structures. Pervasive oxidation of the vein structure exists at surface and continues to an average depth of approximately 30 m.

The Veta Grande vein is the principal vein structure within the Veta Grande vein system and is historically the most important vein of the Zacatecas Mining District. It varies from two to 30 m in width, averaging approximately 10 m wide. The vein strikes northwest-southeast and dips between 60-90o to the southwest. The vein consists of quartz, chalcedony and calcite and often exhibits colloform and crustiform textures with small to medium (1-5 mm) euhedral quartz crystals filling open space cavities. The dominant sulfide mineralization consists of pyrite, sphalerite, and galena, with rare chalcopyrite.

In the immediate vicinity of the Armados and Garcia portals are three known veins situated in the structural footwall of the Veta Grande vein. These veins are identified as Armados vein, San Jose vein, and La Flor vein. Each vein is compositionally and texturally similar to the Veta Grande vein. Vein thickness varies from <1 to >5 ........

Santacruz declared commercial production at the Veta Grande project on October 1, 2016 with initial mining activities focusing on the Veta Grande vein system from the Garcia underground mine and the La Canterra vein system from the Guadalupana underground mine.

Santacruz is actively mining vein material from the Garcia (Veta Grande vein system), Guadalupana and La Mecha underground (La Cantera vein system) using mechanized cut and fill stoping.

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