Trevali Appoints Key Personnel at Halfmile Mine

VANCOUVER, BRITISH COLUMBIA--(Marketwire - Nov. 21, 2011) - Trevali Mining Corporation ("Trevali" or the "Company") (TSX:TV)(TSX:TV.WT)(OTCQX:TREVF)(BVLAC:TV)(FRANKFURT:4TI) is pleased to announce the appointment of an experienced Senior Management Mine Development and Operations Team for its Halfmile Mine and Stratmat Project in New Brunswick, Canada where production is on track to commence by year end.

Key Appointments are as follows:

General Manager—John Griggs, P.Eng, MBA

Mr. Griggs brings in excess of 38 years of regulatory, base-metal mine engineering and operations experience to the team. Specifically, John spent 22 years in the mine engineering department at Xstrata's Brunswick 12 operations, one of the world's largest zinc mines, and 16 years in resource regulatory roles (permitting, development and production) in New Brunswick. He most recently acted as Manager, Resource Development, for New Brunswick's Department of Natural Resources.

Mr. Griggs holds a Bachelor of Science, Mining Engineering, from the University of London, as well as a Master of Business Administration from the University of Western Ontario. He is also registered as a Professional Engineer in New Brunswick.

Safety/Health & HR Manager—Diane Hébert

Ms. Hébert holds a diploma in Business Administration and brings 27 years of expertise in resource industry human resources, specializing in training and development roles. Her previous employers include Tembec, Domtar and most recently, Cementation Canada, a large contract mining company, where she was Manager, Human Resources. Ms. Hébert began her career as a program analyst with Health and Welfare Canada, eventually moving into a consultant role to the Ministry of Education and Training in the area of Human Resource and Training. Following seven years of experience in management training and human resource development in the sawmill industry; Diane joined Cementation in North Bay, Ontario, where she was responsible for human resource policies, recruitment, training and development. Ms. Hébert is a member of HRPA—Human Resource Professional Association.

Halfmile Mine Superintendent—Garnet Klause, P.Eng.

Mr. Klause recently joined the New Brunswick operation as Mine Superintendent to focus on mine development and production activities at Halfmile, and to manage mine-site personnel. Mr. Klause has 23 years of experience in mine engineering and operations and holds a B.Sc. Degree in Geological Engineering from the University of Manitoba. His most recent accomplishments include Project Superintendent for Manroc Developments Inc.'s Hemlo gold mining camp in Ontario where he managed contract mine operations, Alimak stope mining and lateral development. Prior work experience also includes Chief Engineer and Superintendent roles for Placer Dome's Musselwhite mine, technical representative for Western Explosives and Senior Mine Planner for Hudson Bay Mining and Smelting's Ruttan Mine northern Manitoba.

Financial Controls Manager—Accounting & Purchasing—Mark Donnelly, BBA, CMA

Mr. Donnelly brings 10 years accounting, purchasing and concentrate sales experience to the New Brunswick management team after acting as Regional Controller to Xstrata Zinc Canada – Brunswick Mine and Smelter operations since 2008.

Mr. Donnelly attained a degree in Business Administration from the University of Fredericton in 2001 and completed his CMA designation in 2004. Mr. Donnelly worked as an accountant with the Atcon Group Inc., moving on to hold positions such as Senior Accountant and Controller working in the Construction and Fabrication industries prior to joining the startup operation of Blue Note Caribou Mines Inc.'s polymetallic mine in New Brunswick's Bathurst mining camp. During his various work experiences, Mr. Donnelly was directly responsible for accounting functions, payroll, reporting, budgeting, project management and purchasing, and asset management.

ABOUT TREVALI MINING CORPORATION

Trevali is advancing two polymetallic (zinc-lead-silver-copper) deposits to production in Canada and Peru – the Halfmile and Santander mine projects respectively. In Canada, Trevali has the Halfmile and Stratmat polymetallic deposits in the Bathurst Mining Camp of northern New Brunswick, and the past-producing Ruttan copper-zinc mine in northern Manitoba. Mine development is currently underway at the Halfmile Mine Project with a planned production rate of 2,000-tonnes-per-day anticipated to commence by year-end 2011.

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. At the planned 2,000-tonne-per-day Santander operation, mine commissioning is anticipated to commence in the first half of 2012 with full production to follow immediately 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.

On Behalf of the Board of Directors of TREVALI MINING CORPORATION

Mark D. Cruise, President

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.