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Trevali Provides Caribou Zinc Mine Commissioning Update

by ahnationtalk on August 12, 2015198 Views

August 12, 2015

Vancouver, British Columbia: Trevali Mining Corporation (“Trevali” or the “Company”) (TSX: TV; BVL: TV; OTCQX: TREVF; Frankfurt: 4TI) provides a mine and mill commissioning update for its Caribou Zinc Mine in the Bathurst Mining Camp of northern New Brunswick. Since commencing mill commissioning in late -May, the Company has achieved initial production of zinc and lead concentrates and has also shipped and sold initial zinc concentrates in July (Figure 1). A detailed description is provided below and progress highlights are as follows (Table 1):

Table 1: Caribou Mill – July production statistics

Tonnes processed YTD as of July 31/15 (approx.): 52,057 tonnes
Zinc concentrate produced YTD as of July 31/15 (WMT, approx.): 1,933 tonnes
Average zinc concentrate grade: 50.3% Zn
Lead-silver concentrate produced YTD as of July 31/15 (WMT, approx.): 491 tonnes
Average lead-silver concentrate grade: 37.4% Pb, 598 g/t Ag


Ongoing troubleshooting of ramp -up issues continued through the month of July with significant headway realized as the Company continues to ramp up Caribou operations according to the strategy outlined in the Company’s News Release dated May 19, 2015 (see TV-NR-15-10 for details).

The commissioning status of specific mill components is as follows:

Grinding – The new SAG Mill, the two Ball Mills and the three IsaMills are all operational. Ongoing initiatives are focused on optimizing charge rates, grind characteristics and media composition. Fine tuning of the IsaMills has them now operating at near nameplate grind size of 12 microns.

Reagents – With concentrates now being produced, the focus is now on optimization of both zinc and lead reagent mixtures/ratios to bring recoveries towards anticipated nameplate percentages, and optimize concentrate grades and characteristics.

Flotation – Both zinc and lead flotation circuits, including the rougher and cleaner cells, are all online. Additional piping and pumping optimization and replacement occurred during July to further improve circuit stability and is ongoing.

Filtration & Tailings – The zinc and lead filters are both online. Ongoing work in July focused on lead concentrate optimization.

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