Remediating a Remote Open Mine in the Arctic

A schist wall is stabilized in sub-zero temperatures.

Overview

Following the significant failure of a schist wall at an active, open mine in northern Canada, GRW was brought in to develop and execute a remediation plan that ensured a swift return to full production while maintaining the utmost safety standards.

 

Key Considerations:

  • Winter in northern Canada.
  • Minus 40° Celsius temperatures.
  • Remote location in an active mine.
  • 90° open pit mine faces.
 
 
 
 
 

Scope

After being contacted by the client, GRW acted quickly, performing an initial assessment to understand the terrain, scope, and unique risks and requirements of the project. A plan was developed to perform rock stability, scaling, and install bolted mesh barriers along the walls, approximately 60 m above the mine pit floor.


Throughout the project, GRW worked closely with facility project managers to develop a comprehensive plan to remediate the pit walls, as well as create an access, safety, and rescue program for the project.

Challenges

As it was winter and the site was 100 km south of the Arctic Circle, weather posed a significant issue throughout the project. Crews and equipment were specially prepared to perform work without interruption during periods when weather safely permitted.

Bencher and DTH drill equipment was transported from BC through the Northwest Territories to facilitate the installation of access and rescue systems. Check scaling was completed before implementing drilling procedures, followed by bolt and mesh installation required by the project plan.

Drilling equipment running on diesel compressors and pneumatic drill platforms faced the considerable threat of freezing. To prevent this, a specialized modification was installed that allowed it to perform in the extreme cold.

Method

Due to the project's urgency and extreme conditions, a team of highly-seasoned experts was assembled. Modern twin rope access techniques were used to ensure safety standards were achieved throughout the project.


A Marini down-the-hole drill was utilized as a specialized piece of equipment, allowing for the deep hole stability required for the project. Specialized site-specific modifications were implemented to ensure the equipment could be used without interruption during permitted weather windows.

Results

Through GRW’s successful performance in remediating the high wall, the mine was able to return to full production in the shortest time possible.

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