The deposits on the Cordero property do not fit neatly into a single deposit type in any of the systems commonly used to categorize mineral deposits into groups with a similar genesis. This is partly due to the fact that the property is large and hosts many different types and ages of intrusive igneous as well as extrusive igneous rock; but even within the Cordero Main area, observations from surface mapping and core logging are consistent with overlapping deposit types. Of the deposit types that have been described and named in the technical literature, the ones with most relevance to Cordero are as follows:
• extensional intermediate sulphidation epithermal systems like Real de Angeles in Zacatecas;
• carbonate-hosted Pb, Zn (Ag, Cu, Au) in manto-style (skarn) and crosscutting chimney-style and felsic intrusive igneous contact-related massive sulphides like those at Santa Eulalia in northern Chihuahua.

The best-developed mineralization in the Cordero Main area occurs where intrusive igneous dikes and shallow-dipping sills are inter-fingered with marine sediments of the Mezcalera Formation, which consists of interbedded limestones, and sedimentary rocks composed of grains of fine clay (shale) to fine silt (siltstone) as well as larger grains of sand or quartz in sandstones.

The Ag-Au-Pb-Zn content at Cordero is in sulphide minerals, with pyrite, sphalerite and galena accounting for the significant majority of metal content; lesser amounts of t ........

Mining of the Cordero deposit will be done by open pit methods utilizing a traditional drill, blast, load and haul sequence to deliver mill feed to the primary crusher for processing through the sulphide plant or placed on the heap leach pad. Waste material will be sent to either the rock storage facility (RSF) southeast of the pit or to the tailings storage facility (TSF) to the west of the pit.

The current geotechnical dataset is considered sufficient for PEA level-designs. Interramp pit slope angles (measured from bench crest to bench crest) range from 40° at the southwest side of the ultimate pit to 59° at the northeast side of the ultimate pit. Bench face angles range from 69° to 80°. Bench widths range from 8.5 to 16 m and have been designed to adequately retain rockfall.

Four pit phases were developed for the single open pit. Mining occurs on 10 m lifts with safety benches every 20 m using the provided geotechnical parameters by sector. Haul roads are designed at 35.4 m wide to accommodate 230-tonne class haul trucks.

Phase 1 will start being mined in Year-2 and will be utilized as quarry material for construction purposes. Phases 1 and 2 target the highest-grade areas of the deposit and are target the same pit shell target for the two areas. Phase bench elevations will range from 1640 masl to 1340 masl. All waste and mineralized material accesses will be on the southeast side of the phase, where the RSF and process destinations will b ........

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