From 2010-2021 Southern Silver completed programs of geological mapping, surface geochemical sampling and airborne and ground geophysical surveys in support of 80,904 m of core drilling in 186 holes resulting in the delineation of six mineral deposits: the Blind; El Sol, Las Victorias, Skarn Front, South Skarn and Mina La Bocona deposits on the Cerro Las Minitas Property. The Blind, El Sol and Las Victorias deposits comprise multiple sub-vertical northwest-southeast trending zones of semi massive to massive sulphide mineralization. Mineralization is hosted in the skarnoid- and hornfels-altered margins of monzonite and felsite dykes and may be localized along through-going structures or occur as replacements within stratigraphic units. The mineralized zones can be traced for up to 1000 m along strike and up to 800 m down dip. Sulphide mineralization in the Skarn Front deposit is localized at the outer boundary of the skarnoid alteration zone surrounding the Central Monzonite Intrusion at or near the transition to the recrystallized/marbleized carbonate sediments (marmorized zone). The Skarn Front deposit can be traced for up to 1,100 m along strike and up to 1,000 metres depth. Geological modelling suggests that intersections between the sub-vertical, northwest-trending Blind and El Sol mineralized zones and the generally more shallowly dipping Skarn Front may localize higher-grade shoots of mineralization. Drilling in 2020-22 confirmed laterally extensive skarnoid-style mi ........

The Cerro Las Minitas Project is a deposit that extends from near surface to over one km in depth and ranges in width from approximately 2 m to greater than 20 m. Although some parts of the deposit are near the surface, this deposit has been selected for underground extraction using bulk mining methods. Due to the proximity to an active, albeit a small scale operation, backfill was considered for both longitudinal and transverse stoping methods.

Proposed Mining Methods
Based on the parameters of the deposit, longhole open stoping (LHOS) was selected as the mining method. Two variations of longhole open stoping were considered, depending on the extent and width of the mineralisation. Where the mineralisation is narrower the preferred mining method is longitudinal LHOS, while transverse LHOS is proposed where mineralisation is wider. Both methods are proposed to use paste backfill.

A sublevel spacing of 25 m was selected with a maximum stope strike length of 20 m and maximum widths of approximately 20 m. Due to the size of the excavations, transverse mining will be sequenced bottom-up to minimise backfill failure while longitudinal will be top-down.

Mineralisation Width - 20 m;
Length - 20 m;
Height - 25 m;
Width - 20 m.

UNDERGROUND MINE DESIGN
Due to the distance between the various geological deposits, the project is separated into two separate underground designs. The Cerro Las Minitas Main, the larger of ........

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