All mineralization at the Cozamin Mine occurs in veins. Mineralization at Cozamin is best described as zinc-rich epithermal mineralization overprinted by copper-rich mesothermal mineralization. The copper-dominant stage of mineralization appears to cut across earlier epithermal zinc-dominant mineralization, or is enveloped/telescoped by the earlier zinc-dominant mineralization. The epithermal veins display well banded quartz veins and open space fillings and quartz druse vug linings. The higher temperature veins have significantly fewer vugs, and the veins can be massive pyrrhotite-pyritechalcopyrite.

The dominant mineralized vein on the Cozamin Mine is the Mala Noche. This vein has been traced for 5.5 km on surface on the property. It strikes approximately east-west and dips on average at 60° to the North. There are several shafts that provide access to the historical workings at Cozamin. The largest mined area is the San Roberto mine which has a strike length of 1.4 km.

Moderate propyllitic wall rock alteration is generally limited to 3 m into the hangingwall and footwall. Gangue minerals in the Mala Noche vein consist of quartz, silica, calcite, chlorite, epidote and minor disseminated sericite. The quartz occurs as coarse grained druse crystalline masses, and a stockwork of quartz veinlets. Mineralization in the Mala Noche vein at the Cozamin Mine appears to have been episodic. Early epithermal mineralization and alteration (represented by sulphide pseudomorphs of carbonates and possibly barite and well-banded quartz veins and vug linings of quartz druse) have been overprinted by higher temperature pyrite-pyrrhotite-chalcopyrite dominant mineralization in a telescoped, intrusive related hydrothermal system.

Pyrite is the dominant vein sulphide and typically comprises approximately 15% of the Mala Noche vein in the San Roberto mine. It occurs as fine disseminations and veinlets, coarse crystalline replacements, and pseudomorphs of epithermal textured carbonate minerals and possible barite. Arsenopyrite typically occurs as minor, microscopic inclusions in pyrite.

Pyrrhotite is the second most common sulphide mineral but is present only in the intermediate and deeper levels of the San Roberto mine. It occurs as replacement masses, pseudomorphs of platey masses and acicular replacements probably after amphibole. Pyrrhotite commonly occurs as an envelope to, or intermixed with, strong chalcopyrite mineralization.

Chalcopyrite is the only copper sulphide recognized visually at the Cozamin Mine. Like pyrrhotite, it is more common at the intermediate and deeper levels of the mine. It occurs as disseminations, veinlets and replacement masses.

Sphalerite is the dominant economic sulphide in the upper levels in the San Roberto mine. Most of the sphalerite is marmatitic. It occurs as disseminations and coarse crystalline masses and is commonly marginal to the chalcopyrite-dominant portion of the vein.

The Cozamin Mine is an underground mining operation that commenced in 2006. Ore is extracted using three mining methods: cut and fill using waste rock fill, long-hole open stoping, and Avoca - a hybrid of long-hole and cut-and-fill methods. Each method has been assigned to individual mining blocks depending on the physical characteristics of the veins and its suitability to one of the above methods. The mine extends for a strike length of over 1 km and mineral reserves extend to a depth of 700 m. Access to the underground workings is via two service and haulage ramps and a hoisting shaft.

Run of mine ore is stockpiled on surface and sent to the crushing plant. The crushed ore is stored in two ore bins that feed parallel conventional grinding circuits. The resulting product is sent to the copper-lead rougherflotation where a copperlead concentrate is produced. The tailings report to zinc conditioning tanks prior to zinc flotation, where reagents are added to activate zinc mineralization. The tailings go through zinc rougher and cleaning circuits to product a zinc concentrate. Separate copper and lead concentrates are produced from the copper-lead concentrate via selective flotation. The concentrates are thickened and filtered to produce product suitable for transport. The concentrates are trucked to Manzanillo, Colima, Mexico.