Leveraging Advanced Machinery to Build a Safer Mine

6 October, 2024 – the DASA Site has successfully completed the sinking of its first 5.1-meter diameter ventilation shaft. This shaft, along with the second one to be also installed in Niger, forms the backbone of the mine’s ventilation system, enabling production for the initial 10 years.

Drilling such a large-diameter shaft requires extensive expertise, advanced technological resources, and precise organization.

This operation requires a machine with both substantial mechanical power and electrical capacity. The operation utilized the RD7-150 Raise Borer from Master Drilling, a 46-ton DC machine equipped with dual 380 kW motors. This powerful machine can drill holes ranging from 3.1 to 7.1 meters in diameter, generating 7,200 kN of force, and 1,240 Nm of torque, with a power requirement of 1.6 MW.

At DASA, our team successfully drilled a pilot hole with a 4.9-meter (16-inch) diameter, expanding it to a final diameter of 5.1 meters at a depth of 70 meters. This achievement was made possible by the expertise and dedication of our engineers and operators.

The photograph above demonstrates the completed shaft head, while the accompanying video shows the Raise Borer machine in action.

Once operational, this shaft will support an airflow capacity of over 300 m³/s.