September 8, 2016 Corporate Focus Gold Springs Gold-Silver Project, Nevada/Utah, USA Safe, Mining Friendly Jurisdictions www.trimetalsmining.com TSX: TMI & TMI.B US OTCQX: TMIAF & TMIBF TriMetals Mining Inc. – TSX: TMI, TMI.B For Safe Harbor Statement, Qualified Persons and Derivation of Information Refer to Pages 23 and 24 Cautionary Statement on Mineral Resources This Presentation uses the terms 'indicated resources' and 'inferred resources' which are terms recognized and required by Canadian regulations (under National Instrument 43-101 Standards of Disclosure for Mineral Projects), however, these terms are not defined terms under SEC Industry Guide 7 and normally are not permitted to be used in reports and registration statements filed with the United States Securities and Exchange Commission. Investors are cautioned not to assume that any part or all of the mineral deposits in these categories will be converted into reserves. Mineral resources that are not mineral reserves, do not have demonstrated economic viability. In addition, 'inferred resources' have a great amount of uncertainty as to their existence, and economic and legal feasibility. It cannot be assumed that an inferred resource will be upgraded to a higher category. Under Canadian rules, estimates of inferred resources may not form the basis of feasibility or pre-feasibility studies, or economic studies except for preliminary economic assessment as defined under NI 43-101. Investors are cautioned not to assume that part or all of an inferred resource exists, or is economically or legally mineable. All dollar figures in this presentation are expressed in United States dollars unless otherwise indicated 2 TriMetals Mining Inc. – TSX: TMI, TMI.B Corporate Structure Common Shares (TMI) 153.3M 12.3M 16.5M 11.5M 193.6M Issued & Options Warrants Convertible Fully Diluted Outstand. Notes TSX:TMI 52 week range: C$0.06 - C$0.36 Market Cap: C$46M (Sept 6) Avg. Volume (3m): 118K sh./day (TSX) Source: yahoo.com : TriMetals Mining Stock Price Strong financial position with $4 million in treasury* *Per the most recently published interim consolidated financial statements, at June 30, 2016 the Company had $2,6 million in cash and cash equivalents and subsequent to June 30, 2016 the Company received additional $1.6 million in cash (CND$2.1 million) for the second tranche of a private placement which closed on July 11, 2016. 3 TriMetals Mining Inc. – Gold Springs Project Corporate focus is resource expansion and development of the Gold Springs PEA-stage gold-silver project Located in safe, mining friendly Nevada and Utah Very positive PEA (Aug. 12, 2015) yields $137M pre-tax NPV5% and 49.9% pre-tax IRR (“Base Case”) Resource expansion drilling every year since 2011 – drilling in progress Present reported resource (does not include 2015-2016 drilling) 597,000 oz AuEq (M&I)@0.62 gt AuEq** 306,000 oz AuEq (Inferred)@0.46 gt AuEq** Many undrilled outcropping +4gt Au veins – Initial focus of 2016 drilling is 1.6 km Thor Vein System Significant expansion potential as less than 10% of bulk gold target drilled to date Management believes property position is permissive for the discovery of 3-5 million oz Au*** **Using a Cutoff of 0.2 g/t Au and also see Gold Equivalence calculation on page 24. ***It is uncertain if further exploration will result in this quantify of gold being delineated as a mineral resource. The basis on which this potential quantity of gold (which is conceptual in nature) has been determined as a target is based on the Company having completed resource drilling on only portions of 2 of 26 areas of 4 outcropping gold mineralization and none of the buried geophysical targets at Gold Springs, and has already reported a mineral resource within the two drilled areas. TriMetals Mining Inc. – Gold Springs Plan 2016 Exploration Program Trenching in Thor Vein System - completed Drill program to develop a resource on “high Grade” veins at Thor - in progress First very positive drill results released Cultural clearance at Jumbo in Utah - completed Expansion Drilling on Jumbo resource block - in progress Obtain cultural clearance on Etna State Section Resource drilling on Etna State Section 5 TriMetals Mining Inc. – Gold Springs Large Discoveries Becoming Scarce TMI is Developing a New Gold District at Gold Springs Large gold discoveries are becoming scarce world-wide, let alone in mining friendly jurisdictions like Nevada/Utah. Large resources in Nevada are highly prized 6 Gold Springs Project, USA Gold Springs Gold-Silver Resource Growth (Not including late 2015 and all 2016 drilling) Gold Springs Resource Growth (in AuEq* ounces) 1,000,000 800,000 306,000 299,000 600,000 388,000 400,000 415,000 456,000 200,000 233,000 209,000 0 2012 2013 2014 2015 Measured Indicated Inferred Gold Springs’ 74.7 sq. km property has the potential to become a new gold district: Gold discovered starts at surface Existing Mineral Resource is based on drilling less than 10% of gold target PEA stage project with very positive mineral economics Acquired rights to 965 acre feet of water, likely sufficient for 10-15,000 tpd project 7 *see Gold Equivalence calculation on page 24. Gold Springs Project, USA Located in Safe, Mining Friendly Nevada-Utah 8 Gold Springs Project, USA 26 Outcropping Gold Targets 8 km Jumbo Trend 9 Gold Springs Project, USA Geophysical Evidence Excellent correlation between high resistivity rocks (red & orange) and known gold occurrences Grey Eagle 33 km of resistivity Resource boundary with gold potential Area Jumbo Resource Area Very large untested area with bulk- tonnage gold-resource Potential Less than 10% of target drilled Black ovals represent Areas of outcropping gold mineralization Thor Vein System 10 Gold Springs Project, USA Jumbo Resource Area Looking West 11 Gold Springs Project, USA Jumbo Long Section (North-South) Shows Drill Holes with Gold and Silver Assays and Significant Upside Potential to Increase Gold Resource through Drilling Open to the North and South 12 Gold Springs Project, USA 2015 Drilling Expanded Mineralized Envelope AuEq uses a gold/silver ratio of 71.9 and has not been adjusted for metallurgical recoveries 13 Gold Springs Project, USA Grey Eagle Looking West Nevada Resource Area Trench The mineralization starts at the surface: 56 metres averaging: 1.4 g/t Gold and 10.1 g/t Silver Assays were performed in Reno, Nevada by Inspectorate Laboratories, an ISO 9001:2000 Certified laboratory. Gold was analyzed by fire assay of a 30 gram sample with an AA finish. All other elements were analyzed by the ICP-AES 30 element method with 4 acid digestion. The chip samples were collected every 2 to 5 feet and the average weight of each chip sample submitted to the laboratory was approximately 7 kg. 14 Gold Springs Project, USA Mineral Resource as of June 3, 2015 developed in two target areas Grey Eagle plus Jumbo Resource Gold Silver Gold Equivalence Cutoff Au g/t Tonnes Troy oz Grade g/t Troy oz Grade g/t Troy oz Grade g/t AuEq* AuEq* Measured plus Indicated 0.2 30,046,000 434,000 0.45 9,297,000 9.6 597,000 0.62 0.3 19,003,000 347,000 0.57 6,957,000 11.4 469,000 0.77 0.5 7,600,000 206,000 0.84 3,394,000 13.9 265,000 1.09 Inferred ** 0.2 20,887,000 225,000 0.34 4,613,000 6.9 306,000 0.46 0.3 9,889,000 140,000 0.44 2,766,000 8.7 188,000 0.59 0.5 1,842,000 39,000 0.65 691,000 11.7 51,000 0.86 Gold Spring resource grades compare favorably with many of the Nevada mines Round Mountain 0.53 gt Au Rochester 0.1 gt Au plus 0.5 oz/t Ag Marigold 0.46 gt Au Bald Mountain 0.6 gt Au Hycroft 0.33 gt Au 15 * See Gold equivalent (AuEq) calculation on page 24. **Inferred resources are in addition to the Indicated resources Gold Springs Project, USA Preliminary Economic Assessment “PEA” * Contractor Mining Case Highlights: (based on $1,300/oz Au price and $21/oz Ag price) • 15,000 tpd mine plan of 9 years with a 2:1 strip ratio Sensitivity to Varying Gold Prices: • NPV5% of $137.4M ($92.1M after-tax); • IRR of 49.9% (35.8% after-tax); Gold Price per oz $1,000 $1,200 $1,400 • Initial capex of $55M and on-going capex of $24.8M; • LOM payable production of 428K ounces of gold and Pre-Tax NPV5% $16M $97M $178M 4.9M ounces of silver. • After-tax payback of 3.1 years; IRR Pre-tax 10.4% 37.1% 62.3% • $133M of cumulative after-tax free cash flow; • Cash operating cost of $669 per oz Au** and fully- loaded cost $863 per oz Au**; Strong, low strip, technically simple and scalable, heap-leachable open-pit project using a Merrill-Crowe gold-silver recovery process. The project requires low capital. *See Safe Harbor on page 23 - Preliminary Economic Assessments that Include Inferred Resources. ** Cash Operating cost per gold ounce is net of silver credit and includes mining, processing, general and administrative and operating cost contingency; Fully-loaded cost per gold ounce includes Cash Operating cost per gold ounce plus sustaining capital, federal, state and local taxes and does not include initial capital. The portion of the project subject to the updated PEA does not have overriding royalties. 16 Gold Springs Project, USA Thor Vein System An Example of potential high 2 m @9.4g/t Au grade mineralization that and 21.9 gt Ag could be added to The Jumbo PEA model to further enhance economics Grey Eagle Jumbo [email protected] gt Au And 23.7 gt Ag Thor Etna 17 Gold Springs Project, USA Thor Vein System Initial 2016 Drill Results Awaiting assays from additional 7 holes Section Looking North First 2016 drill results from 2.5 holes include 7oz./t gold over 1.5m and three near surface vein