Laser mapping systems installed at Portia Gold Mine

Consolidated Mining & Civil installed Maptek’s Sentry monitoring system to ensure safety at Havilah Resources’ Portia gold mine in South Australia.

An active monitoring system designed to track movement and notify stakeholders about potentially unsafe areas of an open pit operation, the Sentry solution consists of a long range I-Site 8820 laser scanner and dedicated software that help sites measure and analyse unpredictable wall movement.

Chris Giles, managing director of Havilah Resources, said the Sentry product was ideal for the unique situation of the Portia mine.

“The Portia mine is very unusual as the gold deposit sits about 60m to 70m below a surface of soft clay material,” he said.

“To my knowledge no one has dug a mine through this material, at such a depth, before in Australia. Normally miners are cutting through more stable surface material, such as rock.

“As a result wall integrity accuracy is critical, especially for worker safety. The accuracy of this new system allows us to measure any movement in the mine walls down to a couple of millimetres.”

The I-Site point cloud data used in the Sentry solution can also be processed and modelled for survey reconciliation, stockpile volumetrics, geological mapping and kinematic analysis. In addition to allowing several areas to be monitored within a single scan extent, the Sentry system also provides comprehensive information through animations, continual analysis and graphical reports to guide future monitoring and assist with decision-making.

CMC is responsible for removing all of the overburden and bringing the ore to the surface at the Portia gold mine, located 100km northwest of the Broken Hill regional mining centre. The gold at the mine occurs in a
2-3 metre layer below 75 metres of clay overburden totalling about 7 million cubic metres, which is being removed to access the ore.

For the Portia mine application, the Sentry system will track movement and stability of walls in the open pit. The I-Site laser scanner will also be used for routine survey applications throughout the operation. A rugged Maptek mount attaching the I-Site laser scanner to the roof of a site vehicle, gives CMC greater flexibility for surveying large areas efficiently.

CMC Principal Steve Radford explained that the Sentry system helps CMC ensure worker safety in remote environments by providing a diagnostic tracking tool with clear visualisation and analysis capabilities, allowing them to make reliable engineering decisions.


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