TriMetals Mining Inc. Files an Amended Preliminary Economic Assessment for the Gold Spring Project

VANCOUVER, BRITISH COLUMBIA--(Marketwired - Jul 8, 2014) - TriMetals Mining Inc. (TSX:TMI)(TSX:TMI.B)(OTCQX:TMIAF)(OTCQX:TMIBF) (the "Company") announces the filing of an Amended Preliminary Economic Assessment for the Gold Spring Project (the "Amended Report"). The Amended Report restates the resource estimate for Gold Springs and focuses on the results of the base case preliminary economic assessment (the "PEA") which remained unchanged.

The Measured Resource at the Grey Eagle area was re-categorized as Indicated Resource resulting in the Indicated Resource increasing by the same amount as the Measured Resource decreased. The amount of resource being re-categorized was 3,337,000 tonnes @ 0.64 g/t Au and 7.1 g/t Ag for a contained 69,000 ounces of gold and 767,000 ounces of silver using a cut-off grade of 0.20 Au g/t. This equates to 82,000 oz AuEq* @ 0.77 g/t AuEq*.

The PEA has been amended from the "Preliminary Economic Assessment of the Gold Springs Property, Utah/Nevada, USA" prepared for TriMetals Mining Inc. dated April 30, 2014. The amendment did not have an impact on the before and after tax net present values and internal rates of return of the project.

The entire Amended Report containing the mineral resource estimate and PEA can be viewed under the Company's profile on SEDAR or on the Company's website at www.trimetalsmining.com.

* Gold equivalent was calculated using a gold/silver ratio of 57.14.

Qualified Person

The information in this news release was derived from the Amended Report, authored by Lane and Associates, Kurt Katsura and Deepak Malhotra. Lane and Associates prepared the mineral resource estimate and PEA in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects (NI 43-101). Ms. Terre Lane, President of Lane and Associates is a "qualified person", as defined in NI 43-101, is "independent" of the Company, as defined in NI 43-101, and has reviewed and approved the technical information regarding mineral resource estimate and PEA in this release. The Amended Report supporting the mineral resource estimate and PEA was filed on SEDAR on July 8, 2014.

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

The PEA was prepared to broadly quantify the Gold Springs project's capital and operating cost parameters and to provide guidance on the type and scale of future project engineering and development work that will be needed to ultimately define the project's likelihood of a positive feasibility determination and optimal production rate. It was not prepared to be used as a valuation of the project nor should it be considered to be a final feasibility study on which a commercial production decision could be made. The capital and operating cost estimates which were used have been developed only to an approximate order of magnitude based on generally understood capital cost to production level relationships, and although they are based on engineering studies, these are preliminary so the ultimate costs may vary widely from the amounts set out in the PEA. This could materially adversely impact the projected economics of the project. As is normal at this stage of a project, data in some areas was incomplete and estimates were developed based solely on the expertise of the Company's employees and consultants. At this stage of development for Gold Springs the criteria, methods and estimates are preliminary and result in a high level of subjective judgment being employed. There can be no assurance that the potential results contained in the PEA will be realized.

Certain statements contained herein constitute "forward-looking statements". These forward looking statements include, but are not limited to, statements regarding estimated mineral resources, as well as statements regarding estimated net present values and internal rates of return. These forward- looking statements are based on current expectations and entail various risks and uncertainties. Actual results may materially differ from expectations if known and unknown risks or uncertainties affect our business or if our estimates or assumptions prove inaccurate. 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, risks of the mineral exploration industry which may affect the advancement of the Gold Springs project, including possible variations in mineral resources, grade, metal prices, capital and operating costs, and the application of taxes; availability of sufficient financing to fund planned or further required work in a timely manner and on acceptable terms; timely receipt of required permits, availability of equipment and qualified personnel, failure of equipment or processes to operate as anticipated, changes in project parameters as plans continue to be refined; failure of equipment or processes to operate as anticipated; regulatory, environmental and other risks of the mining industry more fully described in the Company's Annual Information Form, which is available on SEDAR at www.sedar.com. The assumptions made in developing the forward-looking statements include: the accuracy of current resource estimates and the interpretation of drill, metallurgical testing and other exploration results; the timely receipt of required permits for the Gold Springs project; the continuing support for mining by local governments in Nevada and Utah; the availability of equipment and qualified personnel to advance the Gold Springs project; execution of the Company's existing plans and further exploration and development programs for Gold Spring, which may change due to changes in the views of the Company or if new information arises which makes it prudent to change such plans or programs; and the assumptions and estimates disclosed in the Amended Preliminary Economic Assessment on the Gold Springs Property, Utah/Nevada, USA with an effective date of April 30, 2014, amended July 8, 2014, authored by Lane and Associates, Kurt Katsura and Deepak Malhotra.

Readers are cautioned not to place undue reliance on the forward-looking statements contained in this press release. Except as required by law, 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 press release describe the Company's expectations as of July 8, 2014.

Readers are also cautioned that the PEA is preliminary in nature and includes inferred mineral resources that 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 no certainty that the results indicated in the PEA will be realized. Mineral resources that are not mineral reserves do not have economic viability.