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Press Releases

2012/02/09 - Montreal, Canada

Trevali selects Veolia Water Solutions & Technologies for halfmile mine effluent treatment plant project

Montreal, February 9, 2012 - The contract for the design and supply of a 1,000-m³/day effluent treatment plant to serve Trevali Mining Corporation'sHalfmile Zinc-Lead-Silver-Copper Mine in New Brunswick has been awarded to Veolia Water Solutions & Technologies Canada. The new zinc-lead-silver-copper mine is situated 60 km south of Bathurst and commenced production in January 2012.

The scope of this fast-track design-build project includes the entire treatment plant as well as the construction of the building. The treatment plant will provide precipitation, decantation and filtration —plus, pH correction to provide a treated mine effluent that meets the Canadian Council of Ministers of the Environment (CCME) Water Quality Guidelines for the Protection of Aquatic Life.

"Trevali is pleased to be working with Veolia in providing a compact turnkey water treatment solution for the Halfmile mining project," says Paul Keller, Trevali's Vice President of Operations. "Having the peace of mind of working with a major solution provider allows the company personnel to focus on mine development and production activities."

The plant incorporates metals precipitation using the ACTIFLO® TURBO, a high-rate, small footprint clarification process. The ACTIFLO process uses sand-ballasted settling and a TURBOMIX™ draft tube reactor that allows for a very compact design with high overflow rates and short detention times. This design enables the unit to perform well under dynamically changing flow rates without impacting final effluent quality. By combining the proprietary Hydrex® reagent to magnesium hydroxide, the solids produced in the ACTIFLO unit will be larger than sodium sulphide, which facilitates downstream filtration.

After clarification, the water undergoes sand filtration to remove any remaining solids, followed by pH correction. Also, the instrumentation and automation package permits remote monitoring of the entire water treatment plant, which is a major benefit for the operation of the plant.

The building will be a 15 m x 22 m steel building with all ancillary services, including a 2 ton overhead crane and water quality laboratory.

The plant is currently in the final construction phase. Trevali has been constructing the Halfmile project civil works since March 2011, and commenced production of the water treatment plant in January 2012, with a planned production ramp-up to a rate of 2,000-tons-per-day.

About Trevali Mining Corporation

Trevali has two advanced-stage polymetallic (zinc-lead-silver-copper) deposits in Canada and Peru - the Halfmile and Santander mine projects respectively. In Canada, Trevali owns the Halfmile Mine and Stratmat polymetallic deposit in the Bathurst Mining Camp of northern New Brunswick, and the past-producing Ruttan copper-zinc mine in northern Manitoba. Production from the Halfmile Mine commenced in early 2012 and will ramp up to a planned production rate of 2,000-tonnes-per-day.

In Peru, the Company has the Santander zinc-lead-silver mine project and the former-producing Huampar silver mine, both located in the Central Peruvian Polymetallic Belt. Mine commissioning is anticipated to commence at the Santander operation in mid- 2012 with ramp up to full 2,000-tonne-per-day production to follow shortly thereafter. Additionally through its wholly-owned subsidiary Trevali Renewable Energy Inc., Trevali is undertaking a significant upgrade of its wholly-owned Tingo run-of-river hydroelectric generating facility along with transmission line upgrades and extensions to allow, in addition to supplying power to the mining operation on the property, the potential sale of surplus power into the Peruvian National Energy Grid.

The common shares of Trevali are listed on the TSX (symbol TV), the OTCQX (symbol TREVF) and on the Lima Stock Exchange (symbol TV).Warrants to purchase common shares of Trevali are listed on the TSX (symbol TV.WT).For further details on Trevali, readers are referred to the Company's web site ( and to Canadian regulatory filings on SEDAR at