Trevali Mining Corp : Trevali receives positive metallurgical results from initial Halfmile mill run

Excellent flotation characteristics and good recoveries produce quality concentrates - optimal precious metal reporting - further optimization anticipated
Vancouver, British Columbia...Trevali Mining Corporation ("Trevali" or the "Company") (TSX: TV; BVL: TV; OTCQX: TREVF; Frankfurt: 4TI) is pleased to announce receipt of final metallurgical reports following the processing of its maiden Halfmile Mine 30,000-tonne toll-milling run through Xstrata's Brunswick-12 Processing Plant. A detailed report by Trevali's metallurgical consultant, Holland and Holland Consultants, states that Halfmile mineralization exhibits superior flotation characteristics and use less reagent to produce concentrates of similar to slightly superior quality to those traditionally produced in the Bathurst Mining Camp.

The initial 30,000-tonne Halfmile mineral processing run occurred over a 4-day period and the results demonstrate a steady improvement with time as the various processing circuits achieved steady-state and the operators obtained a better understanding of the new mineral type (Table 1 & Figure 1).

Table 1: Initial Halfmile Concentrate Grades and Recoveries at Brunswick-12 Mill

	Concentrate		Grades						Recoveries**
		Zn%		Pb%		Cu%		Ag g/t		Au g/t		Zn%		Pb%		Cu%		Ag %		Au %
	*Zinc	53.08	2.57%	0.46%	80	0.26	86.16	-	-	-	-
	Lead	4.8%	45.84	0.69%	681	1.61	-	58.62	-	39.24	-
	Copper	2.78%	7.42%	26.64%	504	3.14	-	-	62.76	7.72	N/A

Assays after Xstrata Zinc-Brunswick Mine and SGS Canada Inc. labs.
*Note, the Brunswick-12 processing circuit is designed to produce a Bulk concentrate (low-value product) - minor Bulk concentrate was produced and was of sufficiently low quantity and high quality that it can be blended into the Zinc concentrate to produce a saleable product. **Final run recoveries.

The initial milling run focused on zinc recoveries, Trevali's principal product, which has achieved nameplate recoveries rates over the four-day period. A larger, 40,000-50,000 tonne milling campaign of stockpiled feed is on-track for mid-June and will continue to optimize and establish operating parameters for Halfmile mineralization, specifically zinc regrind and increased by-product recoveries including lead liberation and pyrite suppression studies.

Figure 1. Halfmile Mine zinc, lead and copper recoveries obtained over initial 4-day milling period.
"It goes without saying that we are extremely pleased with the positive metallurgical results from our Halfmile mineralization. Given the complex nature of the mineralization in the Bathurst Camp it is a testament to the world-class skill set and professionalism of Xstrata's Mill team that they could produce such quality concentrates on a new mineral type, over a compressed milling period, utilizing a process flowsheet designed for a different deposit and all this using a mill not optimally-sized for our mineralization," stated Dr. Mark Cruise, Trevali's President and CEO. "Based on these results we are confident that additional metallurgical optimization is possible short-term at Brunswick-12 and more importantly longer-term once we finalize the acquisition of the more suitably-sized and state-of-art Caribou Milling complex."

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Figure 2: Stratmat deposit, Halfmile Mine and Caribou Mine location map, northeastern New Brunswick
ABOUT TREVALI MINING CORPORATION

Trevali is a zinc-focused base metals producer with operations in Canada and Peru - the Halfmile and Santander mines respectively. In Canada, Trevali owns the Halfmile zinc-lead-silver mine and Stratmat polymetallic deposit, and has entered into a definitive agreement to acquire the Caribou Mine and Mill, all located in the Bathurst Mining Camp of northern New Brunswick. The Company also has the past-producing Ruttan copper-zinc mine in northern Manitoba. Production from the Halfmile mine commenced in early 2012 and is ramping up to the planned production rate of 2,000-tonnes-per-day.

In Peru, the Company has the Santander zinc-lead-silver mine 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 late-2012 with ramp up to full 2,000-tonnes-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 (www.trevali.com) and to Canadian regulatory filings on SEDAR at www.sedar.com.

Qualified Person and Quality Control/Quality Assurance

EurGeol Dr. Mark D. Cruise, Trevali's President and CEO and a qualified person as defined by National Instrument 43-101, has supervised the preparation of the scientific and technical information that forms the basis for this news release. Dr. Cruise is not independent of the Company, as he is an officer and shareholder.

On Behalf of the Board of Directors of
TREVALI MINING CORPORATION

"Mark D. Cruise" (signed)
Mark D. Cruise, President

Contact Information:
Steve Stakiw, Manager - Corporate Communications
Email: sstakiw@trevali.com
Phone: (604) 488-1661 / Direct: (604) 638-5623

This news release contains "forward-looking statements" within the meaning of the United States private securities litigation reform act of 1995 and "forward-looking information" within the meaning of applicable Canadian securities legislation. Statements containing forward-looking information express, as at the date of this news release, the Company's plans, estimates, forecasts, projections, expectations, or beliefs as to future events or results and the company does not intend, and does not assume any obligation to, update such statements containing the forward-looking information. Such forward-looking statements and information include, but are not limited to statements as to: the accuracy of estimated mineral reserves and resources, anticipated results of future exploration, and forecast future metal prices, anticipated results of future electrical sales and expectations that environmental, permitting, legal, title, taxation, socio-economic, political, marketing or other issues will not materially affect estimates of mineral reserves. These statements reflect the Company's current views with respect to future events and are necessarily based upon a number of assumptions and estimates that, while considered reasonable by the Company, are inherently subject to significant business, economic, competitive, political and social uncertainties and contingencies.

These statements reflect the Company's current views with respect to future events and are necessarily based upon a number of assumptions and estimates that, while considered reasonable by the company, are inherently subject to significant business, economic, competitive, political and social uncertainties and contingencies. Many factors, both known and unknown, could cause actual results, performance or achievements to be materially different from the results, performance or achievements that are or may be expressed or implied by such forward-looking statements contained in this news release and the company has made assumptions and estimates based on or related to many of these factors. Such factors include, without limitation: fluctuations in spot and forward markets for silver, zinc, base metals and certain other commodities (such as natural gas, fuel oil and electricity); fluctuations in currency markets (such as the Peruvian sol versus the U.S. dollar); risks related to the technological and operational nature of the Company's business; changes in national and local government, legislation, taxation, controls or regulations and political or economic developments in Canada, the United States, Peru or other countries where the Company may carry on business in the future; risks and hazards associated with the business of mineral exploration, development and mining (including environmental hazards, industrial accidents, unusual or unexpected geological or structural formations, pressures, cave-ins and flooding); risks relating to the credit worthiness or financial condition of suppliers, refiners and other parties with whom the Company does business; inadequate insurance, or inability to obtain insurance, to cover these risks and hazards; employee relations; relationships with and claims by local communities and indigenous populations; availability and increasing costs associated with mining inputs and labour; the speculative nature of mineral exploration and development, including the risks of obtaining necessary licenses and permits and the presence of laws and regulations that may impose restrictions on mining,; diminishing quantities or grades of mineral reserves as properties are mined; global financial conditions; business opportunities that may be presented to, or pursued by, the Company; the Company's ability to complete and successfully integrate acquisitions and to mitigate other business combination risks; challenges to, or difficulty in maintaining, the Company's title to properties and continued ownership thereof; the actual results of current exploration activities, conclusions of economic evaluations, and changes in project parameters to deal with unanticipated economic or other factors; increased competition in the mining industry for properties, equipment, qualified personnel, and their costs. Investors are cautioned against attributing undue certainty or reliance on forward-looking statements. Although the Company has attempted to identify important factors that could cause actual results to differ materially, there may be other factors that cause results not to be as anticipated, estimated, described or intended. The Company does not intend, and does not assume any obligation, to update these forward-looking statements or information to reflect changes in assumptions or changes in circumstances or any other events affecting such statements or information, other than as required by applicable law.

Trevali's production plans at Halfmile-Stratmat and Santander are based only on Indicated and Inferred Mineral Resources and not Mineral Reserves and do not have demonstrated economic viability. Inferred Mineral Resources are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as Mineral Reserves, and there is therefore no certainty that the conclusions of the production plans and Preliminary Economic Assessment (PEA) will be realized. Additionally where Trevali discusses exploration/expansion potential, any potential quantity and grade is conceptual in nature and there has been insufficient exploration to define a mineral resource and it is uncertain if further exploration will result in the target being delineated as a mineral resource.

The TSX has not approved or disapproved of the contents of this news release.

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