Differential GPS brings much needed autonomy to blasting

By | 2021-12-10T06:30:53+00:00 December 10th, 2021|

The new high-accuracy (sub-1m) Differential Global Positioning System (DGPS) from AECI Mining Explosives brings autonomy to the blast hole tagging process, thus maximising efficiency by eliminating potential human error on the bench and ensuring integrity of drill and blast operations.

Safety and good fragmentation are two parameters of principal significance in any blasting process. According to the company, potential human error from incorrect blast hole identification or incorrect delay assignment can be a thing of the past with the new addition to the IntelliShot system.

The timing process is predisposed to human error, with incorrectly marked blast holes resulting in incorrect delay assignment. The process of identifying the location of the unconnected hole is time consuming, while incorrect timing may compromise fragmentation and downstream operations.

Product manager at the company, Ashlin Pillay, explains that by introducing an increased level of autonomy to the blast hole tagging process, DGPS enables faster blast deployment, greater accuracy, and increased efficiency. Although the system is currently still semi-autonomous, AECI Mining Explosives envisages that the technology will enable fully autonomous deployment and tagging in the near future.

Uniform fragmentation to the end user’s desired size contributes massively to efficient blasting and offers increased efficiency throughout the beneficiation process.

High precision

Conventional global positioning systems (GPS) use fixed point receivers, where the location is directly calculated, whereas DGPS requires a GPS receiver to be set up at a known location as a reference. Coordinates of the fixed point are then surveyed and marked from where a much higher level of accuracy can be achieved.

DGPS is capable of achieving sub-1m location accuracy. This high level of precision is a result of the inherent design that mitigates signal degradation. The addition of the DGPS to the already proven IntelliShot electronic initiation system brings the industry closer to autonomous blast hole identification and loading.

Additional benefits

This technology adds increased safety through its ability to protect against human error says Pillay. Blast hole coordinates along with the respective detonator delays are downloaded onto the Tagger to prevent the user from incorrect delay assignments on the bench. The response to blast hole location and fault-finding are made simpler, faster, and safer. Furthermore, the tagging process does not need to follow a specific tagging path.

The DGPS module can be retrofitted onto existing AECI Mining Explosives CE4 Taggers, and the company foresees the extension of this capability in that DGPS modules could be fitted to other equipment such as drill rigs or a Mobile Manufacturing Unit’s auguring arm. This provides end users with accurate position data that can be fed back electronically via the company’s IntelliShot control equipment.

“Multiple uses of DGPS can be achieved on sites where survey suites are not readily available to track drilled holes. Users can create an accurate blast plan by logging hole positions and uploading to ViewShot 3D for detonator delay design. Another key value proposition of this system is data availability, allowing for reconciliation of planned versus actual blast holes, thus enabling continuous improvement on site,” says Pillay.

The system will enable customers to integrate future fully autonomous wireless detonator tagging or blast hole coordinate logging. DGPS will assist in bringing large-scale mining into the digital era and enables new mining methods and blasting techniques to increase productivity and reduce blasting costs.

“Mines will reap quantifiable benefits on their surface operations, including high levels of safety, improved operational flexibility and better ore recovery, all of which are crucial parameters in their quest to operate sustainably,” concludes Pillay.

DGPS. Photo credit: AECI Mining

DGPS. Photo credit: AECI Mining