Trevali Commences Mill Commissioning at Caribou Zinc Mine - Seite 2

To view Figure 2: Caribou mill zinc flotation recovery circuit, please visit the following link: http://media3.marketwire.com/docs/1007850_fig2.pdf

CARIBOU MINING

Underground refurbishment, development and mining has been going exceptionally well year-to-date. There is presently 7.3 kilometres, within a total 13.3 kilometres of underground development, in 10 of 16 levels and sub-levels fully refurbished and available for production operations. In addition 619 metres of waste development, including a new 422-metre ramp to surface stockpile connection (the 2560 Portal) and 278 metres of development in sulphides has been completed since late February (Figure 3).

Experience to date is that ground conditions are better than modeled and are good-to-excellent within the massive sulphide production stopes. Localized areas of poor ground conditions are identifiable and predictable, and suitable support has been successfully planned and implemented ahead of schedule.

Underground optimization is already advanced with Trevali's Drill and Blast specialist on site enhancing blast patterns, blast-hole diameters, powder factors and optimal mineral fragmentation (Figure 4).

To view Figure 3: Caribou Mine underground production and development plan, please visit the following link: http://media3.marketwire.com/docs/1007850fig3.pdf

To view Figure 4: Underground development at Trevali's Caribou Mine, please visit the following link: http://media3.marketwire.com/docs/1007850fig4.pdf

Critically stope-cycle optimization has been ongoing and is better than planned with UG currently producing tonnage from 3 stopes versus 4 as modeled in the restart plans. Production is currently at 1800 tonne-per-day ("tpd") or 60% of nominal run-rate design from these 3 stopes. This is materially better than initial plans where modeled production required 6 stopes in the production cycle for 1800 tpd. The mine is currently producing from single stopes at 1200 tpd versus 500 tpd in the Caribou Preliminary Economic Assessment.