Trevali provides Caribou Zinc Mine re-start update

December 18, 2014

Vancouver, British Columbia…Trevali Mining Corporation (“Trevali” or the “Company”) (TSX: TV; BVL: 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 continue to advance and the project status remains on schedule for start-up commissioning in the first half of 2015. A summary of key current activities is provided below:

MILL
The new 3,000-tonne-per-day Semi-Autogenous-Grinding (SAG) Mill major components are installed and the mill will be commissioned in Q1 of 2015 (Figure 1).

Figure 1: Newly installed 3,000-tpd SAG mill at Caribou

• The three IsaMills installed at Caribou have been inspected by the Xstrata Process Support Group and are in excellent condition for start-up. The Company is proactively replacing the electric motor bearings for enhanced reliability during commissioning and going forward.
• The zinc and lead flotation circuits have been cleaned and repaired where necessary, and copper circuit design and tendering is nearing completion.
• All mill motors and electrical drives have been cleaned and serviced by Original Equipment Manufacturer (OEM) representatives.
• The majority of the pumps have been refurbished and/or replaced and spare pumping capacity components have been sourced from the nearby Brunswick-12 Mine and Mill complex that ceased operations in 2013.
• Plant instrumentation refurbishment is progressing as equipment becomes available and remains on track for H1-2015 Mill Commissioning.

UNDERGROUND (UG)

• The new portal construction commenced in early November and is advancing to schedule (Figure 2). Surface breakthrough is anticipated in Q1-2015 and will ultimately result in significant operational efficiencies by reducing the surface haul distance to approximately 100 metres to the Fine Mineral Bins versus the previous approximately 1.5-km surface route. It is anticipated that this will decrease haul costs, improve UG fleet availability in additional to improving winter production capabilities.
• Approximately 3-years of underground development is currently in place: In detail, ramp and level rehabilitation and access to two of the first four production areas are approximately 90% and 75% complete respectively. The third and fourth production zones are 40 to 50% complete and continue to progress to schedule and plan. There are currently approximately 600,000 tonnes of mineralized material available for production.
• Surface crusher installation is in progress to a newly designed radial stacking pad. Based on the Company’s successful Santander commissioning, Trevali is currently planning to stockpile approximately 60-80,000 tonnes of UG material prior to commencing Q2-2015 Mill commissioning.
• The main dewatering pumps are fully installed and site is currently dewatering at full 600 gallon-per-minute capacity. The Mine is currently dewatered to approximately 250-metres subsurface.
• The UG Paste Backfill study is advancing and results are expected in early Q1-2015.

Figure 2: Underground development of new ramp-portal to surface at Caribou Mine

SURFACE WORKS

• Zinc and lead concentrate shed rehabilitation is in progress and will improve winter concentrate load-outs and management. Copper concentrate shed planning and engineering is advancing well.
• Several site bridges have been replaced in order to improve access to the Tailings Management Facility (TMF). The Reclaim Pumping Station and water polishing pond areas have be raised and placed on new foundations to facilitate potential future TMF expansions.
• Geotechnical drilling has been completed in order to access long-term tailings management planning.
• The Mill site has been contoured to improve surface water management.
• Fire suppression system is refurbished and fully operational.

GEOLOGY

• Exploration targeting and drill testing of potential extensions of both the East and North Mine Limbs has resulted in the intersection of significant intervals of massive sulphide mineralization ranging from 7 metres to plus-45 metres downhole thicknesses and remain open for extension. Assay results are pending and will be released upon receipt.

Qualified Person and Quality Control/Quality Assurance

EurGeol Dr. Mark D. Cruise, Trevali’s President and CEO, and Paul Keller, P.Eng, Trevali’s Chief Operating Officer, are qualified persons as defined by NI 43-101, 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.

ABOUT TREVALI MINING CORPORATION

Trevali is a zinc-focused, base metals mining company with one producing operation in Peru and an advanced-stage mine under development in Canada.

In Peru, the Company is actively producing zinc and lead-silver concentrates from its Santander mine and 2,000-tonne-per-day metallurgical plant.

In Canada, Trevali owns the Caribou mine and mill, Halfmile mine and Stratmat deposit all located in the Bathurst Mining Camp of northern New Brunswick. The Company is currently advancing its 3,000-tonne-per-day Caribou Mill Complex and mine towards scheduled H1-2015 production.

All of the Company’s deposits remain open for expansion.

The common shares of Trevali are listed on the TSX (symbol TV), the OTCQX (symbol TREVF) and on the Lima Stock Exchange (symbol TV). For further details on Trevali, readers are referred to the Company’s web site (www.trevali.com) and to Canadian regulatory filings on SEDAR at www.sedar.com.

On Behalf of the Board of Directors of
TREVALI MINING CORPORATION
“Mark D. Cruise” (signed)
Mark D. Cruise, President

Contact Information:
Steve Stakiw
Vice President, Investor Relations and Corporate Communications
Email: sstakiw@trevali.com
Phone: (604) 488-1661 / Direct: (604) 638-5623

NT3