Trevali Mining Corp. Mining Provides Underground Development Update of Santander Mine in Peru by 24hgold

Re: News - Wednesday, June 19, 2013
Title: Trevali Provides Underground Development Update of Santander Mine in Peru

Vancouver, British Columbia...Trevali Mining Corporation ("Trevali" or the "Company") (TSX: TV and TV.WT; BVL: TV; OTCQX: TREVF; Frankfurt: 4TI) is pleased to provide an underground development update as well as the initial grade comparison results from the Magistral North and Central Deposits at its Santander Mine in Peru.

UNDERGROUND DEVELOPMENT
Development is progressing well. To date eight levels are in place in addition to 12 sub-levels in the Magistral North and Central deposits, four levels -- 7 sub-levels and four levels and 5 sub-levels respectively. The ninth level will open the Magistral South zone for exploitation and is scheduled to be in place by month end (Figure 1).

Figure 1: Current Santander Mine underground workings (white) and planned development (green).

All three Magistral deposits (North, Central and South) are accessed by individual production ramps. The North and Central deposits are connected and break-through from Central to South deposits is anticipated in Q3. This will allow implementation of one-way, high-speed, trackless mining system in addition to enabling greater flexibility for mining planning, scheduling and extraction purposes. It should also greatly reduce the potential for underground bottlenecks for Mill feed. Once this is in place, 2013 development will be largely complete and the joint Trevali-Glencore-JRC mining team will re-focus on long-range mine planning and commence driving 2014 development.

With substantial development now complete the underground team is currently implementing a variety of optimization initiatives focusing on personnel skills, operating procedures, enhanced mining and mucking procedures and a proactive 'pit-stop'-style fleet maintenance program.

Santander Mill commissioning continues to progress and the Company anticipates Zn and Pb-Ag concentrate production soon followed by initial concentrate shipments.

MAGISTRAL GRADE COMPARISON STUDIES
Initial underground grade comparison studies of mined development material -- to underground channel samples -- to the NI 43-101 resource estimate is encouraging - the data is essentially within natural geological error (Table 1).

This initial comparison considers only the limited areas of development in mineral from the Magistral North (MN) and Magistral Central (MC) deposits for which the Company has received geochemical assays from its on-site laboratory.

							Metal Content
		tonnes	Zn %	Pb %	Cu %	Ag Oz/T	t Zn	t Pb	t Cu	Oz Ag
Channel Samples*	MN	21,998	4.11	2.80	0.11	2.10	904	615	25	46,155
	MC	9,523	5.93	0.82	0.11	1.86	565	78	10	17,693
	MN+MC Total:	31,521	4.66	2.20	0.11	2.03	1,469	693	35	63,848
NI 43-101**	MN (at 5 COG)	21,870	4.06	3.07	0.10	2.34	887	672	22	51,283
	MC (at 5 COG)	7,975	6.48	1.33	0.12	3.04	517	106	9	24,212
	MN+MC Total:	29,845	4.70	2.61	0.10	2.53	1,404	778	31	75,496
Surface StockPiles***	MN	27,170	3.57	2.61	0.09	1.94	970	710	25	52,598
	MC	8,128	6.68	0.65	0.11	1.40	543	53	9	11,394
	MN+MC Total:	35,298	4.29	2.16	0.09	1.81	1,513	763	34	63,992

Table 1: Comparison of Block Models to Surface Muck Pile samples

* Trevali internal block model based on Channel Samples
** NI 43-101 compliant Resource Estimate, by Golder Associates (please refer to news release dated July 05, 2012)
*** Surface Stockpiles estimated by survey and muck samples

The Company cautions that full reconciliation of the tonnes and grade will only occur once the material has been processed in the Mill.

Qualified Person and Quality Control/Quality Assurance
EurGeol Dr. Mark D. Cruise, Trevali's President and CEO and M. Dayle Rusk, P.Geo, Trevali's Director, Geology, are qualified persons as defined by NI 43-101, have 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, director and shareholder. Ms. Rusk is not independent of the Company as she is an officer and shareholder.

ABOUT TREVALI MINING CORPORATION
Trevali is a zinc-focused base metals mining company with operations in Canada and Peru.

In Peru, the Company has commenced commissioning at its Santander zinc-lead-silver mine where subsequent ramp up to the planned 2,000-tonnes-per-day production is anticipated by mid-year 2013.

In Canada, Trevali owns the Caribou mine and mill, Halfmile mine and Stratmat polymetallic deposit all located in the Bathurst Mining Camp of northern New Brunswick. Initial trial production from the Halfmile underground mine was successfully undertaken in 2012 and the Company anticipates commencing operations at its 3,000-tonne-per-day Caribou Mill Complex in 2014.

All of the Company's deposits remain open for expansion.

The common shares of Trevali are listed on the TSX (symbol TV), the OTCQX (symbol TREVF) and on the Lima Stock Exchange (symbol TV). Certain 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" (signed)
Mark D. Cruise, President

Contact Information: Steve Stakiw
Vice President, Investor Relations and 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 Caribou-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.

We advise US investors that while the terms "measured resources", "indicated resources" and "inferred resources" are recognized and required by Canadian regulations, the US Securities and Exchange Commission does not recognize these terms. US investors are cautioned not to assume that any part or all of the material in these categories will ever be converted into reserves.

This news release does not constitute an offer to sell or a solicitation of an offer to buy any of the securities in the United States. The securities described herein have not been and will not be registered under the United States Securities Act of 1933, as amended, or the securities laws of any state and may not be offered or sold within the United States, absent such registration or an applicable exemption from such registration requirements.

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

Copyright � 2013 TREVALI MINING CORPORATION (TSX: TV) All rights reserved. For more information visit our website at http://www.trevali.com/ or send email to info@trevali.com ..
Message sent on Wed Jun 19, 2013 at 7:28:42 AM Pacific Time

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