INTRODUCTION
Boretech were contracted by a valued client to design and construct via HDD at Bellevue Gold mine.
SCOPE
The Scope of works was for 4 drill shots across the Goldfields Highway. 1 x 63mm communications
conduits in one shot and 3 x 160mm Orange power conduit in the other shots.
EQUIPMENT
• BT04 – Plant trailer
• BT52 – Prime Mover
• BT63 – Kubota 5T excavator
• BT83 – Plant trailer
• BT90 – STG 8,000 ltr Vac truck
• BT142 – Conduit trailer
• BT143 – Vermeer D60x90 Drill Rig
• TRU138 – Light Vehicle
• Compressor Y1260 Atlas Copco
GROUND CONDITIONS
Ground conditions onsite were a mixture of solid Basalt and broken/weathered shales.
CHALLENGES
Boretech’s crew encountered some significant ground changes across the works.
• An Air Hammer was used to do the pilot and 1st pass ream to 8″.
• To complete the works the original methodology was modified from the initial plan to Push ream
using HDD Air hammer to 10″ .
• A rock roller reamer and Bentonite based muds were used to open the holes from 8″ to 10″ this gave
the crews the confidence in the hole cleaning to pull the pipe with no issues.
TEAM SUCCESS
Boretech’s crew onsite were able to complete the works well within the allocated timeline. This was
also the first time an Air Hammer push reaming bit was used by Boretech and the process was
efficiently used by the crew.
The Crew also Identified the need to use a Bentonite based mud ream with a 10″ rock roller in the
section of the hole that was Broken Basalt / shale.
DURATION
17 days onsite including site clean and pack up and 2 days Mobilisation/Demobilisation.
DATE COMPLETED
November, 2024
