Klondex Exploration Program Extends Joyce Vein and Vonnie Vein at Fire Creek

VANCOUVER, BRITISH COLUMBIA--(Marketwired - May 21, 2014) -

• 40.0 g/t (1.17 opt) Au over 1.49 m (4.9 ft) - FCU-0004
• 12.8 g/t (0.37 opt) Au over 6.16 m (20.2 ft) - FCU-0008
• 30.4 g/t (0.90 opt) Au over 2.47 m (8.1 ft) - FCU-0029
• 158.7 g/t (4.63 opt) Au over 1.13 m (3.7 ft) --FCU-0049
• 350.0 g/t (10.21 opt) Au over 0.70 m (2.3 ft) -- FCU-0050

Klondex Mines Ltd. (TSX:KDX)(OTCQX:KLNDF) today provides an update on recent underground infill and exploration drilling from its Fire Creek Project near Elko, Nevada. A total of 21 holes have been drilled to the east of the main decline in 2014 from the Joyce drifts (5400 and 5420 South), Spiral 2, and Diamond Drill Station (DDS) 6 (See FIGURE 1).

A total of eight core holes were drilled east from multiple drill stations located in the Joyce 5400 South drift to test the southern extension of the Vonnie Vein. Drilling intersected the Vonnie Vein in seven of the eight drill holes. These holes suggest mineralization continues along the Vonnie Vein another 45.7 m (150 ft) to the south, and at depth 15.2 m (50 ft). Additional 2014 drilling is scheduled to the south of these intercepts to continue defining the southern extension of the Vonnie Vein.

Drilling east from DDS-6 continues to suggest continuity of mineralization along the Joyce Vein and the Vonnie Vein. The drilling intercepted significant mineralized material in seven of the eight drill holes. These drill holes infilled an area 45.7 m (150 ft) along strike and 53.3 m (175 ft) of vertical extent on the Joyce Vein. Additionally, the Joyce Vein widths demonstrate the potential to introduce long hole stoping, which could result in lower costs and more efficiency.

Brent Kristof, Klondex Chief Operating Officer, stated, "These drill results continue to unlock value at Fire Creek. The 2014 drilling program is intended to enhance our understanding of the epithermal mineralization while raising confidence in the resource categories. Fire Creek continues to add value to the Company with its high grades. Excavating an additional level provides a top cut access that may be used to set up long hole stoping as well as providing additional drilling platforms for exploration drilling."

Note: True widths are not yet known.

The technical information contained in this press release has been reviewed and approved by Mark Odell of Practical Mining LLC, an Independent Qualified Person (Nevada PE 13708 and SME 2402150) for the purposes of National Instrument 43-101.

Assays were performed by ALS Chemex of Elko, Nevada (an independent laboratory), as directed under the supervision of Klondex staff.

About Klondex Mines Ltd. (www.klondexmines.com)

Klondex Mines is focused on the exploration, development and production of its high quality gold and silver projects. The Company is operating an ongoing bulk sampling program at its Fire Creek gold project located in north central Nevada. Fire Creek is in a mining-friendly jurisdiction, with onsite power and mining infrastructure, and near major producers. Midas, Klondex's newly acquired operating mine and milling facility are located ~100 miles north of Fire Creek.

Cautionary Note Regarding Technical Information and Forward-looking Information

A production decision at the Midas mine was made by prior owners of the mine, prior to the completion of the acquisition of the Midas mine by Klondex. To the knowledge of Klondex, this production decision was not based on a feasibility study of mineral reserves demonstrating economic and technical viability prepared in accordance with NI 43-101 but was based on internal studies conducted by the prior owner of the mine. Klondex has no reason to believe that the data on which such studies were based or that the results of such studies are unreliable. However, readers are cautioned that there is increased uncertainty and higher risk of economic and technical failure associated with such production decisions.

This news release contains certain information that may constitute forward-looking information under applicable Canadian securities legislation, including but not limited to information about the timing and success of exploration drilling activities. This forward-looking information entails various risks and uncertainties that are based on current expectations, and actual results may differ materially from those contained in such information. These uncertainties and risks include, but are not limited to, the strength of the global economy; the price of gold; operational, funding and liquidity risks; the degree to which mineral resource estimates are reflective of actual mineral resources; the degree to which factors which would make a mineral deposit commercially viable are present; the risks and hazards associated with underground operations; and the ability of Klondex to fund its substantial capital requirements and operations. Risks and uncertainties about the Company's business are more fully discussed in the Company's disclosure materials filed with the securities regulatory authorities in Canada and available at www.sedar.com. Readers are urged to read these materials. Klondex assumes no obligation to update any forward-looking information or to update the reasons why actual results could differ from such information unless required by law.