The Project is planned to be operated as an exclusively underground operation. The current mine plan includes only the sulfide material from the principal veins, which include veins CC, C1, A4, F1, G1, San Mateo, Roca Negra, Hiletas, Terneras, Chicago, and Escondida. The plan targets an annual maximum of 112,775 tonnes.
Tetra Tech has conceptually planned stopes for two scenarios to determine potentially mineable Resources, targeting a mill feed of 325 tonnes per day. Scenario 1 includes Measured, Indicated, and Inferred Resources, and Scenario 2, excluding the Inferred material. Scenario 1 contains a potentially Minable Resource totaling 1.24 Mt tonnes for mining over 11 years, from and stope development. Scenario 2 contains a potentially Mineable Resource of 443 kt for mining for 4 years.
An underground site visit was conducted on December 10, 2019. The past extraction methods observed during the visit were Mechanized Cut and Fill stoping and Mechanized Resuing Cut and Fill stoping. These two techniques are considered for the conceptual plan and are suitable for the steeply dipping veins found at the Project.
Resue mining methods considered a minimum width of 0.7 meters, which was demonstrated in recent test mining at the site. Main access ramps will be 4 meters high by 4 meters wide. Cross Cuts and footwall development were considered in the plan. The loss of Resources available to mining through mini ........
