Atlas Copco Robbins 91RHC Raiseborer
Raisebore Australia have been contracted to provide major Raiseboring Services to Aeris Resources – Tritton Operations located near Nyngan in New South Wales.
The project is to complete a variety of raiseboring works and includes an 865 metre deep by 5.0 metre diameter Return Air Raise (RAR) from surface to 4385 level. RBA is using an Atlas Copco Robbins 91RH C raisebore machine to complete the project.
The construction of the shaft includes the drilling of a 15″ pilot hole utilising the Micon Rotary Vertical Drilling System (RVDS) followed by back reaming of the 15″ pilot hole with a 5.0 metre diameter reamer.
The Pilot hole was completed in October 2016, drill depth was 865 metres with 0.08% drilling accuracy – this equates to 700 mm deviation from the design centre-line of the hole…this is precision drilling. An excellent result!