La Mina is mainly hosted by a sequence of predominantly basaltic to andesitic volcanics with a central felsic unit constituting the Eocene portion of the Macuchi Unit. The basalt-andesite volcanic sequence is in contact with a black shale unit to the west and a polymictic conglomerate to the east. The polymictic conglomerate is a much younger, unconformable unit covering in part the Macuchi Unit, and the black shales represent a conformable sedimentary sequence overlying the volcanic sequence.

With the exception of preferentially sulphide-replaced clasts, there are no primary sulphide textures at La Mina within the massive sulphide unit.

Well-developed planar layering in the sulphide bodies is tectonic in origin, with total textural destruction of primary features.

La Mina mineralization occurs at the contact between hanging wall basaltic to andesitic volcanics and the footwall andesitic rocks. The massive sulphide zone is usually conformably overlain by a narrow unit of jaspilitic exhalite which acts as a stratigraphic marker horizon.

Mineralization in the La Mina South and North Blocks occurs as massive to semi-massive lenses with thicknesses varying from several decimetres to a maximum of 12 meters, averaging 6 meters, with lateral extension that can reaches 100 meters. The mineralization occurs mainly as bedded layers and, to a lesser extent, as massive bodies with nondescript textures. Within a single sulphide zone, no geometr ........

Toachi would operate the proposed underground mine using its own labour and conventional technologies and equipment. Mine consumables such as fuel and rock bolts would be purchased from suppliers.

The La Mina VMS deposit comprises the La Mina South block and the La Mina North block. For present preliminary mine planning purposes, the La Mina North block is subdivided into two zones referred to as the “Upper North zone” and the “Lower North zone”; and the La Mina South block is referred to as the “South zone”. The proposed mine plan includes production from each of these three zones. The PEA assumes that Toachi would:
- Commence underground mine development in Year -1 by developing a new portal and a ramp to the Upper North zone. The Upper North zone is scheduled to be mined in Years 1 to 3. It is understood that a previous mine operator mined approximately 173 kt from the Upper North zone in years 1975 to 1981. The PEA assumes that some historic mine access headings would be rehabilitated and used as mine ventilation / escapeway headings.
- Develop a second new portal and ramp to access the Lower North zone and the South zone which are scheduled to be mined in Years 2 to 8 and Years 3 to 8 respectively.
- The proposed 800 tpd mill is scheduled to ramp-up and be commissioned in the first quarter of Year 1. The mine is scheduled to deliver 240 kt of material to the mill for processing in Year 1 increasing to 288 kt/yr in Year 2.

The ramps ........

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