Modern Mining July 2018

COVER STORY

Key features of the Sandvik DS221L  Improved safety: no worker exposure to unsupported ground  Improved ergonomics: no more manual rod handling  Increased productivity: up to 50 %more cable installed per crew, per machine, per month  Drill up to 6 metres in 2 metre height  One-hole automation (drilling and rod recovery)  Improved repeatability due to automation  Grout consistency due to the automated grout-control system It is also built to be robust and durable with a compact turret that ensures smooth operation in low-seam areas. In digitalised environments, the rig is compatible with Sandvik’s OptiMine ® monitoring system. As for suitability, the Sandvik DS221L cable-rock bolter has com- pleted a gruelling 12-month trial at Two Rivers mine where it successfully drilled and installed over 1 000 m of cable holes of different lengths and diameters on a single-shift-per-day cycle. “With a strong technical team from Two Rivers providing their input, and our own design and application teams providing developed cable underneath the hole. Then the operator spins the nut to expand the shell on the top of the cable and grip the rock – and secure the bolt in place. An onboard batching plant takes care of the grouting and ensures the hole is properly sealed to allow the grout to set hard. The mobile rig is mounted onto Sandvik’s current carrier, making it easily manoeuvrable and familiar to operators due to its common control. The drilling is based on the powerful drifter RD314 (14 kW) already used on most D_211L-V machines, leading to simplified and reliable operation and the commonality of parts throughout an entire operation. Maximum availability In line with modern underground mine require- ments, the Sandvik DS221L is engineered for safety with a variety of features that ensure reli- able, efficient and precise bolting, and reduce the risk of unsteady or hazardous ground. It is compliant with current South African and European mining requirements and meets the specifications proposed by a knowledgeable team of geotechnical, engineering and mining professionals – as well as miners. It ticks every box in terms of productivity, safety and user friendliness, says Sandvik.

constant input, this has been a tough and chal- lenging project,” Pule says. “Now as we move toward completion and the final industriali- sation of our bolter, it is rewarding to see its success knowing that this machine will save lives and offer higher productivity in our mines. “Two decades after pioneering low-profile mining equipment in South Africa, the Sandvik DS221L is a new member in the low-profile family that will deliver safer, faster and more productive mining.” 

The automated operation of the rig means that no hands-on operator interven- tion is needed.

The Sandvik DS221L in action.

July 2018  MODERN MINING  21