Mincon Group PLC was founded in 1977 in Shannon, Ireland. Mincon manufactures and distributes a range of precision engineered hard rock drilling tools for a variety of industries including Mining, Exploration, Waterwell, Geothermal, Construction, Horizontal Directional Drilling, Oil-Gas and Energy.

  • Flushing improves drilling speed
  • Drilling speed enhances pilot bit life

  • Cutting edges improve drilling in hard clay

  • Spiral grooves push material out when rotating

  • All cuttings and flushing air are kept inside of the casings — so there is no air escape to the surroundings

  • Removes the danger of over drilling (sandy formations)

  • Removes the danger of air escape (clay formations


Symmetrix product range is made to cover all drilling applications

and has various solutions to suit different requirements.

  • Permanent casing

  • Retrievable casing

  • Horizontal applications

  • Drill through casing for rock sockets




System with drill through pilot bit
  1. Casing is installed until seated into bedrock.

  2. Drill through pilot bit is unlocked from ring bit and, after that, pilot bit drills a rock socket. Drill string is pulled out from the hole.

  3. Reinforcement element is installed and concrete poured into the hole.

The new Elemex system is designed to minimize the air escape to the surrounding soil preventing overdrilling and damages to nearby structures.

  • Casing sizes 3"- 48"

  • Safe

  • Economical

  • Precise

  • Productive

  • Simple design


  • Nothing left in the hole

  • No reverse rotation needed! Bit wings retract inside the casing eliminating unscrewing problems

  • Faster penetration rates — large bit face area for transferring blow energy

  • Rapid penetration/minimum drilling time — bit used at full operating pressure of hammer

  • Simultaneously drill and case — wings extend further than OD when bit reaches bottom

  • Peak performance — overburden and solid rock formations

DK Casing Advance System

  • The most efficient way of carrying casing down-the-hole

  • Made of premium US steel for strength and durability

  • Innovative, simple, yet proven design

  • Available for most hammer shanks

  • Superior technology for outstanding performance

DK SPLIT-RING casing Advance System

The newest Split-Ring version of DK Casing Advanced System means increased productivity, longer life, and straighter holes.

DURAWING is a concentric overburden system designed for casing installation drilling range of 4" to 32" diameter hole, specialized through various formations into bedrock. The wings are enclosed in the pocket area, making it the most professional & efficient system in the market as it is free from clogging in loose overburden material while it goes down to bedrock. When the drilling starts, wing bits come out with unique cam sliding mechanism. The key feature of DURAWING is the self-actuating wing bit system that is reliable regardless of unpredictable ground conditions.

Features and Benefits
• Unique sliding mechanism leads to absolute workability
• Simple parts replacement
• Low running cost
• Same performance in horizontal drilling
• Prevent jamming with internal air exhaust


© 2019 by Keystone Drill, Inc. Designed by

Corporate Headquarters

184 Alisa Street

Somerset, PA 15501


Branch Locations

12655 Route 536
Punxsutawney, PA 15767

315 Zane Grey Road
Norwich, OH 43767

@2019 Keystone Drill, Inc. Designed by Precision Business Solutions