Improving convergence monitoring at Rio Tinto’s Argyle mine

Rio Tinto engaged LiDAR specialist MINELiDAR to demonstrate an improved method for convergence monitoring.

SLAM-based LiDAR data, captured by Emesent’s Hovermap mobile mapping system, was compared to traditional tape extensometer measurements.

Designed for GPS-denied, harsh underground environments, Hovermap is able to rapidly scan and process accurate, high resolution point cloud data of drives and other excavations.

Historically, displacement in drives is measured wall-to-wall, using tape extensometers.

This method is time consuming and only measures at fixed, coarsely spaced locations 0.8 m to 1.5 m above the ground; thus creating spatial bias.

The method is also sensitive to damage and replacement of wall pins and can expose personnel to significant underground hazards.

Emesent’s mobile SLAM-based LiDAR mapping system, Hovermap, offers a variety of data capture methods to suit the environment (vehicle, drone, backpack and tether) and can scan a wide area rapidly.

It can be operated remotely, with personnel remaining safe under supported ground, while providing a full understanding of displacement around the target, at an acceptable level of accuracy.


Download the whitepaper below to find out more:

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