Trevali Commences Mining at Caribou Zinc Mine in Anticipation of Q2 Mill Commissioning

VANCOUVER, BRITISH COLUMBIA--(Marketwired - March 30, 2015) - Trevali Mining Corporation ("Trevali" or the "Company") (TSX:TV)(LMA:TV)(OTCQX:TREVF)(FRANKFURT:4TI) provides a status update on construction and mine re-start activities at its wholly-owned Caribou polymetallic mine and mill complex located in the Bathurst Mining Camp of northeastern New Brunswick, Canada.

Both surface and underground development programs at Caribou have advanced significantly during the first quarter including the recent commencement of mining activities. The project status remains on schedule for start-up commissioning in the second quarter of 2015. A summary of key current activities is provided below:

MILL

• The milling circuit is predominantly refurbished and ready for operation with the new 3,000-tonne-per-day Semi-Autogenous-Grinding (SAG) mill installed and aligned (Figure 1). The two Ball Mills have been refurbished and will be available for commissioning following upcoming replacement of upgraded trunnion seals. The three M1000 IsaMills have been inspected and are in excellent condition (Figure 2). The Company has proactively replaced motor bearings following which they will be available for commissioning.

• The Zinc and Lead flotation circuits and associated pumps have been refurbished or replaced and are ready for commissioning. The Copper circuit design has been completed, tendered, with the majority of equipment sourced (from the former Brunswick-12 Mill) and on-site. During the commissioning period the Company intends to initially focus on the established Zinc and Lead (Silver) recovery circuits following which it will commission the new Copper circuit.

• In order to potentially fast-track mill commissioning and technically de-risk start-up, Trevali's mill operations team recently travelled to Australia to visit partner Glencore's Mount Isa and McArthur River zinc operations for knowledge transfer opportunities in IsaMill operations, fine grind flotation performance, maintenance practices and trouble-shooting. Additionally, experienced Glencore IsaMill operational specialists will be made available to assist Trevali's technical team onsite at Caribou during the upcoming mill commissioning and ramp-up. Trevali's team also took the opportunity to examine and discuss various other potential post-commissioning opportunities with their Glencore counterparts.

• DRA Americas Inc., a South African specialist metallurgy and plant operations group, has also been retained to provide additional expert support to the Caribou team as we commence mill commissioning and metallurgical optimization going forward. The DRA team has mobilized to site and is currently working on enhancing the mill maintenance programs in order to maximize equipment availability both during and post commissioning periods.

To view "Figure 1: Newly installed 3,000-tonne-per-day SAG mill at Caribou Mine," please visit the following link: http://media3.marketwire.com/docs/trevali_mc_march30_figure01.pdf