Klondex Announces High Grade Exploration Results at True North; Intercepts 5.78 opt Au over 3.7 ft (198.1 g/t over 1.1 m)

VANCOUVER, BC--(Marketwired - July 26, 2017) - Klondex Mines Ltd. (TSX: KDX) (NYSE MKT: KLDX) ("Klondex" or the "Company") is pleased to provide an update on underground drilling at its True North Gold Mine ("True North") in Manitoba, Canada. A portion of these drill results are included in the mineral reserve and mineral resource estimates released on May 12, 2017 and March 29, 2017, respectively.

True North Drilling Highlights: (see TABLE 1 for complete results)

• 32-17-022: 5.78 opt Au over 3.7 ft, or 198.1 g/t over 1.1 m (710 FW - 32 Level)
• 32-17-024: 1.23 opt Au over 6.0 ft, or 42.1 g/t over 1.8 m (710 - 32 Level)
• 32-17-014: 0.86 opt Au over 6.0 ft, or 29.5 g/t over 1.8 m (710 FW - 32 Level)
• 32-17-016: 0.95 opt Au over 15.6 ft, or 32.6 g/t over 4.8 m (710 FW - 32 Level)
  - Including 1.98 opt Au over 5.8 ft, or 67.8 g/t over 1.8 m
• 635-17-007: 0.67 opt Au over 7.5 ft, or 22.8 g/t over 2.3 m (751 - 6350 Level)
• 635-17-017: 0.40 opt Au over 23.4 ft, or 13.7 g/t over 7.1m (710 - 6350 Level)
• 635-17-020: 1.62 opt Au over 5.9 ft, or 55.6 g/t over 1.8 m (710 - 6350 Level)
• 635-17-024: 0.42 opt Au over 41.1 ft, or 14.3 g/t over 12.5 m (710 - 6350 Level)
  - Including 1.60 opt Au over 6.0 ft, or 54.7 g/t over 1.8 m

True North Gold Mine Drilling Summary: (FIGURE 1)
Assay results have been received for 104 underground drill holes totaling 64,227 ft (19,576 m). These holes targeted the up dip extension of the 710 zone from the 6350 level and the down dip extension of the 710 and 710 footwall lens at the 32 Level.

Up Dip Extension of 710:
Drilling targeted 710 and 710 footwall structures up dip above the 6350 Level. Results from this program suggest the mineralization extends approximately 360 ft (110 m) vertically and continues to be open up dip.

Down Dip Extension of 710:
The objective of this drilling was to test the down dip extension of the 710 vein from the 32 Level. Drill results show that the 710 vein, as well as a new high grade structure in the footwall of the 710 vein, continues from the current workings down approximately 830 ft (250 m) to the 32 Level. Both zones remain open at depth and along strike to the east.

Future Drilling:
Moving forward we are drilling on 16 Level to test the up dip projection of 710 approximately 1,000' (305 m) above our recent 6350 drilling success. Concurrently we have an aggressive plan to add resource within close proximity to current mining fronts. We have a drill set up and coring on 28 Level following up on positive results from the 711 down dip extension from earlier this year. We will move a drill to 24 Level to further define the 711 vein system up above 24 Level and we plan to mobilize an additional drill rig to drill the down dip and eastern extent of the Cohiba.