Trevali Strengthens Management Team

VANCOUVER, BRITISH COLUMBIA -- (Marketwire) -- 05/31/11 -- Trevali Mining Corporation ('Trevali' or the 'Company') (TSX: TV)(OTCQX: TREVF)(FRANKFURT: 4TI) is pleased to announce important Management team additions as part of its aggressive growth strategy, and shift from exploration and development to planned production at Halfmile in New Brunswick, Canada and Santander in Peru over the next 9 months. The Company welcomes the following individuals whose contribution to the team will carry Trevali forward into its new status as a base and precious metal producer and will strengthen, support and compliment the current Peruvian operations group.

Chief Financial Officer

The Company has appointed Anna Ladd as its Chief Financial Officer effective May 2, 2011. A Certified Management Accountant, Ms. Ladd received a Bachelor of Commerce degree from the University of British Columbia in 1991 and a Masters of Arts in Economics from Queen's University in 1993.

Anna has over 15 years of experience in financing and financial controls in relation to the mining industry from mine controller up to and including responsibility for multiple large scale open pit and underground base and precious metal production units. Anna has served as Vice President Finance and Chief Financial Officer for a number of TSX listed junior mining and development companies in addition to several mid-size to senior gold and base metal producers including Grande Cache Coal's operations, Kinross Gold Corporation's Fort Knox, Round Mountain and Kettle River operations and Vale Inco's Thompson and Sudbury base metal operations.

Concurrent with Ms. Ladd's appointment, Michael Kinley has stepped-down as CFO in order to devote more time to several early-stage exploration companies of which he is also the Chief Financial Officer. The Board would like to take this opportunity to thank Mr. Kinley for his exceptional service as the Company's CFO these past three years.

Vice-President of Operations

The Company is also pleased to announce the appointment of Paul Keller, P.Eng. as Vice President Operations. Mr. Keller brings extensive mine operations experience in Canada with 27 years of experience most recently as Manager of Technical Services for a major Canadian mining contractor where he led a team of engineers and designers on various mining contracts for major mining companies. Mr. Keller began his career with Rio Algom Limited and has also worked in various management roles with Barrick Gold's Hemlo mine in operations, engineering and maintenance. Mr. Keller holds a Bachelor of Engineering/Mining from Laurentian University and is a Professional Engineer.

Vice-President of Exploration

The Company has appointed Dayle Rusk, P.Geo. as its Vice President of Exploration. Ms. Rusk has over 30 years of base and precious metal production and exploration experience in underground and open-pit mines. Dayle was previously Chief of Technical Services for Imperial Metals where she was responsible for all aspects of engineering and production geology including short and long-range planning, mine design, resource-reserve calculations and subsequent production-reconciliation studies. She has also held roles as Senior Production Geologist at Goldcorp's Red Lake mine and Anglo American's Hudson Bay Mining and Smelting Flin Flon production unit and most recently with Kria Resources.

Ms. Rusk holds a B.Sc. (Honours), Earth Science Major, degree from the University of Waterloo, Ontario (1976) and is a member of the Association of Professional Engineers and Geoscientists of British Columbia (since 2004) the Association of Professional Engineers and Geoscientists of Manitoba (1998-2001, 2007 to present) the Geological Association of Canada, the Canadian Institute of Mining, Metallurgy and Petroleum, and the Society of Economic Geologists.

Chief Geologist

The Company has appointed Daniel Marinov as Chief Geologist. Mr. Marinov has over 21 years of international experience in the mining and mineral exploration industry - including 5 years in an underground production environment. He has extensive experience in precious, base metal and industrial minerals exploration having worked throughout Eastern Europe, Asia, Australia, as well as Central and South America with Rio Tinto and Anglo American in senior geologist and management roles. Most recently, Daniel was the project exploration manager at Anglo's Michiquillay porphyry copper-gold-molybdenum deposit in Peru. Daniel will be focusing on rapidly advancing and expanding the Company's Santander polymetallic and Huampar silver-gold projects Peru.

Mr. Marinov holds a Master of Science degree in mineral exploration from the University of Mining and Geology of Sofia, Bulgaria.

Corporate Secretary

Effective April 14, 2011, the Company has appointed Erin Walmesley as Corporate Secretary to replace Marla Ritchie, who resigned as Corporate Secretary in order to devote more time to other issuers of which she is also the Corporate Secretary. The Board would like to take this opportunity to thank Ms. Ritchie for her exceptional service as the Company's Corporate Secretary these past three years.

Ms. Walmesley has over 22 years of experience in the corporate securities industry. Her experience included assisting management of listed companies with regulatory filings and corporate governance matters as a paralegal with the firm of Maitland & Company. Ms. Walmesley has been an officer of a number of public companies listed on the TSX Venture Exchange.

Grant of Options

The Company further announces that, pursuant to its Stock Option and Stock Bonus Plan, it has granted incentive stock options to certain of its directors, officers and consultants to purchase up to an aggregate of 2.2 million common shares in the capital stock of the Company. The options are exercisable on or before May 31, 2013 at a price of $1.60 per share.

ABOUT TREVALI MINING CORPORATION

Trevali is advancing two polymetallic deposits to production in Canada and Peru - the Halfmile and Santander projects respectively. In Canada, through its recent acquisition of Kria Resources, Trevali has the Halfmile and Stratmat polymetallic deposits near Bathurst, New Brunswick, and the Ruttan copper-zinc deposit in northern Manitoba. Advanced permitting and engineering studies are in progress at Halfmile with proposed production at a rate of 2,000-tonnes-per-day anticipated to commence in 2011.

At Santander, in conjunction with Glencore International A.G., mine commissioning and production is anticipated to commence at 2,000-tonne-per-day in late 2011 with full production to follow immediately thereafter. Additionally through its 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 currently listed on the TSX (symbol TV). For further details on Trevali, readers are referred to the Trevali'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.

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

Contacts:

Trevali Mining Corporation

Steve Stakiw

Manager - Corporate Communications

(604) 488-1661

(604) 408-7499 (FAX)
sstakiw@trevali.com
www.trevali.com