PRD Weep Hole
Horizontal dewatering
Available on request
- Hole Ø
- 127–203 mm
- Depth
- 250 m
- Pull-up
- 12,680 kgf
- Torque
- 5,150 Nm
Horizontal Dewatering (Weep Holes)
Water trapped behind an open-pit wall raises pore pressure and weakens the slope. Horizontal drains, or weep holes, let it drain out by gravity for safer slopes and a drier pit.
Request rental quoteHow it works
A dedicated rig drills long holes horizontally, or at a slight upward angle, into the pit wall. It must hold alignment over long runs, handle rods safely at the face and retain enough pull-back force to recover the string.
Used for
- Pit-wall depressurisation and slope stability
- Drier, safer working benches
- Horizontal holes up to 250 m
Rigs for this work
Frequently asked questions
+How long can the drains be?
The PRD Weep Hole drills up to 250 m, at 127–203 mm (5"–8") with a DTH hammer.
Rental quote
Request a rig rental quote
Tell us about your project and we'll reply with availability, the right configuration and pricing.
Related guides
11 Nov 2026
Pit Dewatering: Horizontal Drains or Dewatering Wells?
Two ways to control groundwater in an open pit. What each does best, why many mines use both, and where horizontal drains fit.
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11 Nov 2026
Mobilising a Drill Rig to a Remote Mine Site: A Practical Checklist
Access, pads, fuel, water, safety and paperwork: what to have ready so the rig starts drilling the day it arrives.
Read article →11 Nov 2026
Horizontal Dewatering: Why Weep Holes Matter for Pit Wall Stability
Water trapped behind a pit wall raises pore pressure and weakens slopes. Horizontal drain holes give it a way out.
Read article →