Trevali Publishes 2021 Sustainability Report

VANCOUVER, June 28, 2022 - Trevali Mining Corp. ("Trevali" or the "Company") (TSX: TV) (BVL: TV) (OTCQX: TREVF) (Frankfurt: 4TI) announces that it has published its 2021 Sustainability Report that details our approach and progress towards integrating sustainability into all aspects of our business.

"Trevali's fourth annual Sustainability Report represents the latest stage of an evolution in our reporting as we make steps on our journey to becoming a more sustainable organization," said Ricus Grimbeek, President CEO. "While the report details some of our accomplishments in 2021, I must first acknowledge the terrible loss of eight of our colleagues at the Perkoa Mine in Burkina Faso. The intense and unseasonal rainfall on the early morning of April 16, 2022, created a flash flood that breached the mine's defenses, flooding the underground mine and fatally trapping eight of our workers. Our most sincere condolences are with the families, friends, and communities of our deceased colleagues at this difficult time. All of us at Trevali grieve their loss. We will never get our colleagues back, but we do pledge to learn and implement all the lessons from this tragedy across our operations, share these widely, and thereby play our part in helping the mining industry to avoid such events in the future. The potential impact of a changing global climate on the design and operation of mines cannot be underestimated. Extreme weather events such as this, occurring outside of the usual wet seasons, are devastating and it appears likely that they are to become more frequent."

"At Trevali, we see the annual sustainability reporting process as achieving two key objectives. Firstly, as a communication tool to report 2021's ESG performance to our stakeholders transparently and accurately in a balanced manner. And secondly, as an audit of our ESG programs and systems in relation to our business goals, using a third-party to pre-audit our ESG activities. In our 2021 report, you will read about our achievements, challenges, and our progress towards our goals as the world still wrestled with the COVID pandemic. In doing so, I hope that you will see how central sustainability is to not only our business model but to the whole mining industry. Integrating sustainability into every fiber of the global industry is not going to be easy, but Trevali is committed to playing its part in this vital strategic endeavour," said Grimbeek.

Richard Weishaupt, Senior Vice President, Health, Safety, Environment, and Community, stated, "In the 2021 Sustainability Report there are many examples of how we have progressed as a Company. "Regarding environmental compliance, I am happy to report that once again in 2021, Trevali received no material environmental penalties or fines at any of our operations. In addition, something that demonstrates conservation of resources having a positive impact on the environment as well as contributing to economic efficiencies, 100% of total waste rock generated at our operations was returned underground and repurposed as backfill. The dedication of our teams over the long run is also evident at the Perkoa Mine, where the group received the National Occupational Health Inspection Award for operating the second-best private occupational health clinic in Burkina Faso and recognition from the National Council for our efforts in supporting the fight against HIV and AIDS. Such achievements reflect our long-standing commitment to the communities where we operate. In 2021, we invested more than $10.5 million in community development projects across all our operations. The future offers even more chances to innovate with the planned expansion of Rosh Pinah and the construction of a nearby solar power plant to provide 30% of electricity needs."

2021 Sustainability Performance Includes:

• In 2021, we reduced our significant incidents by 30% over 2020 and our Total Recordable Injury Frequency (TRIF) for employees and contractors combined was 8.7.
• Increased Board representation of women with three female Directors out of eight on the Trevali Board following the appointment of Jeane Hull effective February 1, 2021. The Company continues to encourage broader forms of diversity at the management and Board level with a view to achieving the target of 30% of senior leadership positions being held by women.
• Spent US$178 million procuring goods and services from national suppliers, including US$110 million on local suppliers. A total of 86% of our total supply chain is comprised of national business in the countries in which we operate.
• Published a positive NI 43-101 Rosh Pinah Mine expansion ("RP2.0") Feasibility Study in August 2021, with work continuing to secure project financing for the expansion. RP2.0 is expected to increase the capacity of the mine and mill by 86%, from 0.7 million tonnes per annum to 1.3 million tonnes per annum over a 12-year mine life. The expansion project will incorporate sustainable technologies and processes to improve the safety, health, environmental footprint, and local economic impact of the mine, while strengthening our commitment to local communities and the region.
• Entered into a 15-year renewable power purchase agreement with EMESCO for the supply of solar power equivalent to 30% of the expected annual energy consumption for the Rosh Pinah Mine. The agreement was incorporated into the RP 2.0 feasibility study. Construction began in the second quarter of 2022 and the power plant is expected to reduce greenhouse gas (GHG) emissions at the Company level by 6%.
• Reported repurposed waste rock use for the first time resulting from improved tracking practices. Achieved net positive waste rock management with 100% of the total waste rock generated at all our operations was kept underground and repurposed as backfill. In fact, we repurposed 1.8 times more waste rock than we generated by diverting 451,570 tonnes from legacy waste rock piles on our sites as underground backfill. Trevali is committed to repurposing historic waste rock as underground backfill whenever possible in order to reduce our long-term environmental liability.
• Improved our Corporate Sustainability Assessment score for the Dow Jones Sustainability Index (DJSI) from a 45 to a 50 during 2021, reflecting a continuation of improvements from Trevali's score of 9 in 2018, and significantly above industry average score of 34 in 2021.

The report was prepared with guidance from the Global Reporting Initiative (GRI) Standards and select disclosures in accordance with the Sustainability Standards Accounting Board (SASB) Metals and Mining Industry Standards, covering the period from January 1 to December 31, 2021. Additionally, we have mapped our areas of focus to the United Nations Sustainable Development Goals (SDGs). We are committed to the Task Force for Climate Financial Disclosure (TCFD) and will be progressing on the TCFD recommendations in 2022. Trevali's 2021 Sustainability Report, as well as the GRI and SASB Indices for the report, can be found under the Sustainability Reporting section of Trevali's website at Click Here.

Trevali welcomes comments, questions, or suggestions about the sustainability report and related information. Please send your feedback to sustainability@trevali.com.

About Trevali Mining Corporation

Trevali is a global base-metals mining Company headquartered in Vancouver, Canada. The bulk of Trevali's revenue is generated from zinc and lead concentrate production at its three operational assets: the 90%-owned Perkoa Mine in Burkina Faso, the 90%-owned Rosh Pinah Mine in Namibia, and the wholly owned Caribou Mine in northern New Brunswick, Canada. In addition, Trevali owns the Halfmile and Stratmat Properties and the Restigouche Deposit in New Brunswick, Canada. Trevali also owns an effective 44% interest in the Gergarub Project in Namibia. The Company's growth strategy is focused on the exploration, development, operation, and optimization of properties within its portfolio, as well as other mineral assets it may acquire that fit its strategic criteria. Trevali's vision is to be a responsible, top-tier operator of long-life, low-cost mines in stable pro-mining jurisdictions. Trevali is committed to socially responsible mining, working safely, ethically, and with integrity. Integrating responsible practices into its management systems, standards, and decision-making processes is essential to ensuring everyone and every community's long-term sustainability.

The 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.

Cautionary Note Regarding Forward-Looking Information and Statements

This news release contains "forward-looking information" within the meaning of Canadian securities legislation and "forward-looking statements" within the meaning of the United States Private Securities Litigation Reform Act of 1995 (collectively, "forward-looking statements"). Forward-looking statements are based on the beliefs, expectations and opinions of management of the Company as of the date the statement are published, and the Company assumes no obligation to update any forward-looking statement, except as required by law. In certain cases, forward-looking statements can be identified by the use of words such as "plans", "expects", "outlook", "guidance", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "believes", or variations of such words and phrases or statements that certain actions, events or results "may", "could", "would", "might", "will be taken", "occur" or "be achieved" or the negative of these terms or comparable terminology. Forward-looking statements relate to future events or future performance and reflect management's expectations or beliefs regarding future events including, but not limited to, statements with respect to the Company's operations, including the Company's growth strategies and planned development activities and achievement of the objectives stated in the 2021 sustainability report, the suspension of mining and milling operations at Perkoa, the results of any investigation of the flooding incident, and the Company's assessment of the effect of the flooding on the safety and structural integrity of Perkoa's underground areas and the length of time before underground mining operations can be recommenced safely at Perkoa. By their very nature, forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include, among others, risks related to the Company's plans to remedy the impact of the flooding at the Perkoa Mine, including that such efforts and plans will not be effective or achieve their desired outcomes; dependence on key personnel; labour pool constraints; labour disputes; increased operating and capital costs; foreign currency exchange rate fluctuations; operating in foreign jurisdictions with risk of changes to governmental regulation; compliance with governmental regulations; compliance with environmental laws and regulations; maintaining ongoing social license to operate; impact of climatic conditions on the Company's mining operations; limitations inherent in our insurance coverage; litigation; and other risks of the mining industry including, without limitation, other risks and uncertainties that are more fully described in the Company's annual information form, interim and annual audited consolidated financial statements and management's discussion and analysis of those statements, all of which are filed and available for review under the Company's profile on SEDAR at www.sedar.com. Although the Company has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. Trevali provides no assurance that forward-looking statements will prove to be accurate, as actual results and future events may differ from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements.

SOURCE Trevali Mining Corp.