TriMetals Mining's Subsidiary, South American Silver, Provides Update on the Arbitration Against Bolivia

VANCOUVER, BRITISH COLUMBIA--(Marketwired - May 4, 2015) - TriMetals Mining Inc. (TSX:TMI)(TSX:TMI.B)(OTCQX:TMIAF)(OTCQX:TMIBF) (the "Company") reports that on April 30, 2015, after prior consultation with the parties, the Tribunal confirmed that the Oral Hearing in the international arbitration filed against Bolivia by the Company's Bermudan subsidiary, South American Silver Limited will take place from July 11-22, 2016 (excluding Saturday July 16 and Sunday July 17). The Oral Hearing was initially scheduled for May 2016 by the Tribunal's Procedural Order No.1.

The proceedings are currently in the document exchange phase which is expected to be completed by the end of August 2015. Prior to the Oral Hearing the parties will submit further written pleadings with South American Silver Limited expected to reply to Bolivia's statement of defense in November 2015, Bolivia submitting its rejoinder in February 2016 and South American Silver Limited submitting its rejoinder on jurisdiction in March 2016. Upon request from the parties and for good cause the tribunal may decide to further modify these dates.

About TriMetals Mining Inc.

TriMetals Mining Inc. is a growth focused mineral exploration company creating value through the exploration and development of the near surface, Gold Springs gold-silver project in mining friendly Nevada and Utah in the U.S.A.; the advancement of the large scale Escalones copper-gold project in Chile; and realization of value from the expropriated Malku Khota project in Bolivia through an arbitration process.

The Company's approach to business combines the team's track record of discovery and advancement of large projects, key operational and process expertise, and a focus on community relations and sustainable development. Management has extensive experience in the global exploration and mining industry.

The Company's common shares and Class B shares are listed on the Toronto Stock Exchange under the symbols "TMI" and "TMI.B" and the common shares and Class B shares also trade on the OTCQX market under the symbol "TMIAF" and "TMIBF". Additional information related to TriMetals Mining Inc. is available at www.trimetalsmining.com and on SEDAR at www.sedar.com.

Forward-looking Statements

This News Release contains forward-looking statements, including statements regarding the expected timing of the oral hearing, of the completion of the document production phase and of the submission of the reply and rejoinder in the arbitration proceedings against Bolivia. These forward-looking statements are based on current expectations and various estimates, factors and assumptions and involve known and unknown risks, uncertainties and other factors.

Readers are cautioned not to place undue reliance on these statements as the Company's actual results, performance or achievements may differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements if known or unknown risks, uncertainties or other factors affect the Company's business, or if the Company's estimates or assumptions prove inaccurate. Therefore, the Company cannot provide any assurance that forward-looking statements will materialize. Factors that could cause results or events to differ materially from current expectations expressed or implied by the forward-looking statements, include, but are not limited to, the advancement of the international arbitration process in a customary manner and in accordance with Procedural Order No.1, as amended in April 2015 with the extension of the oral hearing date, and other risks more fully described in the Company's Annual Information Form filed and publicly available on SEDAR at www.sedar.com. The assumptions made in developing the forward-looking statements include the advancement of the international arbitration process in the customary manner and in accordance with Procedural Order No.1, as amended.

Subject to applicable laws, the Company assumes no obligation to update or revise any forward-looking statement, whether as a result of new information, future events or any other reason. Unless otherwise indicated, forward-looking statements in this News Release describe the Company's expectations as of May 4, 2015.

Contact

Ralph Fitch
President & CEO
303.584.0606
ralphfitch@trimetalsmining.com

Matias Herrero
Chief Financial Officer
303.584.0606
mherrero@trimetalsmining.com