12.9 metres of 4.77% Zn, 2.02% Pb, 0.43% Cu, 51.14 g/t Ag & 1.57 g/t Au;

7.1-metres of 4.91% Zn, 2.06% Pb, 0.37% Cu, 77.92 g/t Ag & 2.52 g/t Au

Trevali added to S&P/TSX Equal Weight Global Base Metals Index

VANCOUVER, BRITISH COLUMBIA--(Marketwired - Mar 13, 2017) - Trevali Mining Corporation ("Trevali" or the "Company") (TSX:TV)(LMA:TV)(OTCQX:TREVF)(FRANKFURT:4TI) announces that exploration drilling at its Caribou Zinc Mine in the Bathurst Mining Camp of New Brunswick has intersected significant massive sulphide mineralization approximately 350-metres outside the currently defined measured and indicated resource.

Drill hole BR-1017 was designed to test the approximately 200-metre west-northwest down-dip extension of drill hole BR-1014A (that intersected 50.9 metres grading 5.08% Zn, 1.76% Pb, 0.37% Cu, 59.66 g/t Ag & 1.63 g/t Au, see Trevali news release dated April 16, 2015). The hole intersected 7.1 metres of massive sulphide at a downhole depth of 812.5 metres (vertical depth of approximately 725 metres) grading 4.91% Zn, 2.06% Pb, 0.37% Cu, 77.92 g/t Ag & 2.52 g/t Au (Table 1).

Drill hole BR-1018 was designed to test the northwest down-plunge extension of the "Caribou Mineral Horizon" that remains relatively underexplored (Figure 2). The hole intersected 32.1 metres of sulphide mineralization at a downhole depth of 808 metres (vertical depth of approximately 770 metres) grading 3.36% Zn, 1.28% Pb, 0.74% Cu, 37.41 g/t Ag & 0.94 g/t Au, within which several higher-grade intervals occur including 12.95 metres of 4.77% Zn, 2.02% Pb, 0.43% Cu, 51.14 g/t Ag & 1.57 g/t Au (Table 1).

Down hole geophysics (BHEM) from both of these holes suggests strong continuity of mineralization in the area around BR-1014A, additional follow up drilling is underway with the goal of defining the limits of mineralization and brining this zone of mineralization into the geologic resource.

"These significant, deeper massive sulphide mineralized intercepts at our Caribou Zinc Mine continue to demonstrate the resource expansion potential of the deposit," stated Dr. Mark Cruise, President and CEO. "The ultimate mine life at Caribou has yet to be defined and we remain greatly encouraged by the results that clearly demonstrates the deposit remains open at depth."

The Company looks forward to the completion of its 2016/2017 winter drill campaign and will release the results as they become available.

Drill hole Depth From - To (metres)  Core Length Interval* (metres) Zn (%) Pb (%) Cu (%) Ag (g/t) Au (g/t)
BR-1016    No significant intercept
BR-1017    812.58 - 819.68           7.10                           4.91   2.06   0.37   77.92    2.53
BR-1018    808.00 - 840.10           32.10                          3.36   1.28   0.74   37.41    0.94
           incl. 808.00 - 820.95     12.95                          4.77   2.02   0.43   51.14    1.57
           incl. 822.90 - 830.50     7.60                           1.30   0.37   1.84   19.53    0.33
           incl. 836.24 - 840.10     3.86                           5.65   1.69   0.72   62.49    0.95

Table 1: Summary of BR-1016-1018 drill hole assay results. *Length and specific gravity weighted composites. Intervals are approximately 60-70% of true thickness.

To view Figure 1: Geologic map with projected sulphide mineralization, please visit this link: http://media3.marketwire.com/docs/1088579_FIGURE-1.pdf

To view Figure 2: 3D long view of the Caribou mine, please visit this link: http://media3.marketwire.com/docs/1088579_FIGURE-2.pdf

Trevali Mining added to S&P/TSX Equal Weight Global Base Metals Index

Effective at the open of trading on Monday, March 20, 2017, Trevali will be added to the S&P/TSX Equal Weight Global Base Metals Index.

The S&P/TSX Equal Weight Global Base Metals Index is the equal weighted version of the S&P/TSX Global Base Metals Index, a benchmark of securities involved in the production or extraction of base metals, and a subset of the S&P/TSX Global Mining Index.

Qualified Person and Quality Control/Quality Assurance

EurGeol Dr. Mark D. Cruise, Trevali's President and CEO and Daniel Marinov, P.Geo, Trevali's VP Exploration, 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. Mr. Marinov is responsible for all aspects of the work, including the quality control/quality assurance programs. Dr. Cruise is not independent of the Company, as he is an officer, director and shareholder. Mr. Marinov is not independent of the Company as he is an officer and shareholder. Drill core samples were processed and assayed in the Santander mine onsite laboratory. Zinc, lead and silver, assays were obtained by Aqua-Regia dissolution followed by Atomic Absorption measurement. Values of lead and zinc over 15% are assayed by volumetric method. Analytical accuracy and precision are monitored by the analysis of reagent blanks, reference material and replicate samples. Quality control is further assure d by the use of international and in-house standards. Blind certified reference material is inserted at regular intervals into the sample sequence by Trevali personnel in order to independently assess analytical accuracy. The onsite laboratory is outsourced and managed by SGS-Peru personnel. SGS-Peru's quality system complies with the requirements for the International Standards ISO 9001:2000 and ISO 17025: 1999. Finally, representative blind duplicate samples are routinely forwarded to an ISO compliant third party laboratory for external quality control.

ABOUT TREVALI MINING CORPORATION

Trevali is a zinc-focused, base metals mining company with two commercially producing operations.

The Company is actively producing zinc and lead-silver concentrates from its 2,000-tonne-per-day Santander mine in Peru and its 3,000-tonne-per-day Caribou mine in the Bathurst Mining Camp of northern New Brunswick. Trevali also owns the Halfmile and Stratmat base metal deposits, located in New Brunswick, that are currently undergoing a Preliminary Economic Assessment reviewing their potential development.

The common shares of Trevali are listed on the TSX (symbol TV), the OTCQX (symbol TREVF), the Lima Stock Exchange (symbol TV), and the Frankfurt Exchange (symbol 4TI). For further details on Trevali, readers are referred to the Company's website (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 intended use of proceeds in connection with the Offering, the accuracy of estimated mineral resources, anticipated results of future exploration, and forecast future metal prices, expectations that environmental, permitting, legal, title, taxation, socio-economic, political, marketing or other is sues will not materially affect estimates of mineral resources. 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 Canadian dollar and 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 do es 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 resources 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; and 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 plan at the Caribou Mine is based only on measured, indicated and inferred resources, and not mineral reserves, and does not have demonstrated economic viability. Trevali's production plan at the Santander Mine is based only on indicated and inferred mineral resources, and not mineral reserves, and does 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 miner al 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.

Steve Stakiw Vice President, Investor Relations and Corporate Communications Phone: (604) 488-1661 / Direct: (604) 638-5623 sstakiw@trevali.com