Trevali Reports Mine and Mill Commissioning Update for Caribou Zinc Project

Trevali Mining Corporation provides a mine and mill commissioning update for its Caribou Zinc Mine in the Bathurst Mining Camp of northern New Brunswick. The Company reports that significant progress has been achieved since announcing the commencement of mill commissioning in late-May.

A detailed description is provided below and summary highlights are as follows:

• Underground ("UG") mining continues to progress well resulting in a significant coarse mill-feed stockpile of approximately 110,000 tonnes of mineralized material readily available for ongoing mill commissioning.
• UG dewatering and refurbishment are on schedule to be complete in August and October respectively.
• An approximately 10,000-metre UG resource conversion and exploration drill program will commence in July.
• Mill commissioning has progressed as per the commissioning strategy outlined in the Company's News Release dated May 19, 2015 (see TV-NR-15-10 for details).
• All mill circuits - Crushing - Grinding - Reagents - Flotation - Filtering and Tailings are now integrated and functional with a June end-of-month availability factor of approximately 94% at an approximate daily throughput of 1,500-tonnes-per-day. Mill throughput will continue to ramp up throughout the summer months.
• Commissioning initially focused on the zinc circuit where saleable-quality zinc concentrates have been successfully produced grading approximately 53-56% Zn. The commissioning team is now concentrating on the lead circuit, where lead has been successfully floated to produce an initial Pb concentrate, and ongoing copper circuit installation.

"Commissioning at our Caribou Zinc Mine continues to progress well as we've been systematically bringing the various milling, grinding and flotation recovery circuits online," stated Dr. Mark Cruise, Trevali's President and CEO. "While it is still early in the commissioning process and lots of work remains, we have made an excellent start. The Caribou team continues to do an exceptional job having achieved within a one-year period both mining and milling operations and commencing initial concentrate production."