Dr. Mark Cruise reports

TREVALI DECLARES COMMERCIAL PRODUCTION AT CARIBOU ZINC MINE FOLLOWING RECORD JUNE PERFORMANCE

Effective as of July 1, 2016, Trevali Mining Corp. has achieved commercial production at its Caribou zinc mine in the Bathurst mining camp of northern New Brunswick. Following a successful commissioning period, Caribou is now operating consistently in a manner intended by the company and as demonstrated in the June results, with mill and underground operations delivering the strongest monthly performance to date with record mine and mill tonnage and throughput, zinc recoveries and concentrate production. A detailed description and discussion are provided below, and progress highlights are as follows.

           CARIBOU MILL -- KEY COMMISSIONING AND PRELIMINARY PRODUCTION STATISTICS
                                        (figures rounded)


                                      Q1 2016      April, 2016        May, 2016       June, 2016

Tonnes mined                          191,005           58,564           57,103           72,686
Tonnes milled                         200,670           60,032           53,038           73,176
Average milled tonnes per 
day (i)                                 2,675            2,636            2,874            2,867
Average head grades 
Zinc (%)                                  5.9              6.1              5.7              5.9
Lead (%)                                  2.6              3.0              2.6              2.4
Silver (ounces per ton)                   2.0              2.7              2.3              2.4
Average recoveries 
Zinc (%)                                   71               74               78               80
Lead (%)                                   58               57               58               55
Silver (% in lead
concentrate)                               38               32               31               30
Concentrate produced 
(dry metric tonnes)
Zinc                                   17,732            5,832            5,041            7,282
Lead                                    7,586            2,634            1,968            2,446
Concentrate grades
Zinc (%)                                   48               46               47               47
Silver (ounces per ton)                   4.0              5.3              5.1              4.7
Lead (%)                                   39               40               40               43
Silver (ounces per ton)                  20.3             19.5             19.9             21.5

(i) Exclusive of downtime for scheduled mill servicing and maintenance cycle days.

"Declaring commercial production at Caribou represents a major milestone for Trevali's second operating zinc mine and strengthens the company's position as the only current primary zinc producer on the Toronto Stock Exchange poised to benefit from the forecast zinc commodity price rally," states Dr. Mark D. Cruise, Trevali's president and chief executive officer. "This achievement, during a time of challenging market conditions, is a testament to the professionalism, dedication, attitude and hard work of our Caribou team, including our valued contractors and partners. Based on our experience at the Santander mine, I remain extremely confident ongoing optimizations at Caribou will continue to build upon these foundations during the remainder of 2016, exemplified by Caribou zinc recoveries in early July already averaging 82 per cent."

With the achievement of this key milestone, Trevali will continue to implement its business initiatives in order to continue to optimize operations and ramp up production at the Caribou zinc mine to further boost efficiencies, recovery rates and ultimately metal concentrate production.

Caribou mill

During June, the Caribou metallurgical team made further improvements on increasing zinc recoveries into entitlement ranges as outlined in the Caribou preliminary economic assessment report (see technical report on preliminary economic assessment for the Caribou massive sulphide zinc-lead-silver project, Bathurst, N.B., Canada, prepared by SRK Consulting (Canada) Inc. on the company's website or on SEDAR).

The company continues to focus on highlighted areas for metallurgical improvement with modifications to be implemented during continuing scheduled maintenance periods. Modifications completed during June and which are continuing include:

• Increase in the number of sample stations for the on-stream sample analyzer -- in progress;
• Semi-autogenous grinding mill modifications, installation of newly designed lifters and shell liners -- in progress and will continue during scheduled shutdowns throughout the summer period;
• Pumping infrastructure, including capacity and electrical upgrades, is in progress; approximately 55 per cent of pumps are either changed and/or upgraded with the remaining works to be completed during the summer period; the upgrades are designed to result in improved circuit stability (and consequently recoveries) when handling the finely ground process feed;
• Trial of zinc and lead circuit modifications to recycle cleaner streams to feed streams to potentially boost recoveries -- in progress;
• Plant water chemistry investigations -- in progress;
• Copper circuit testwork using plant feed is continuing with additional work to be implemented following final upgrades and improvements to both the zinc and lead circuits.

Caribou mining

With the zinc circuit essentially derisked, the site continues to focus on underground operations in particular debottlenecking initiatives. Work is continuing; however, June successfully delivered the largest amount of stope tonnes to the mill to date with monthly production increasing to an average of 2,423 tonnes per day. From July onward, mining will start reintroducing development feed tonnage, which, in conjunction with other planned improvements, is anticipated to further boost production rates upward of 2,700 tonnes per day.

Geologically, year-to-date reconciliation to the block model is very high at 97-per-cent correlation, and dilution remains below design levels resulting in underground delivering increased metal units to the mill. A 10,000-metre resource conversation drill program is in progress and will be continuing to year-end. Mineralization remains open for expansion at depth and to the northwest, and the company classifies the exploration potential as good to excellent.

Caribou production guidance (July 1 to Dec. 31, 2016) in payable metals is approximately:

• Zinc -- 37 million pounds to 41 million pounds;
• Lead -- 14 million pounds to 15 million pounds;
• Silver -- 380,000 ounces to 420,000 ounces.

Head grades are anticipated to range from 5.9 per cent zinc to 6.2 per cent zinc, 2.5 per cent lead to 2.7 per cent lead and 65 grams per tonne silver to 70 grams per tonne silver.

Qualified person and quality control/quality assurance

Dr. Cruise, EurGeol, Trevali's president and CEO, and Paul Keller, PEng, Trevali's chief operating officer, are qualified persons as defined by National Instrument 43-101, and have supervised the preparation of the scientific and technical information that forms the basis for this news release. Dr. Cruise is not independent of the company as he is an officer, director and shareholder. Mr. Keller is not independent of the company as he is an officer and shareholder.

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