Redpath Mining says its raiseboring division has recently completed a record 875.1 m pilot hole at an underground mining operation in Quebec, Canada.
The record-breaking hole, carried out with the Redbore 90EX raise drill, was completed well ahead of schedule and broke through with an accuracy of 0.03% (260 mm) over the length of the hole, Redpath said.
“With this first phase of the raise complete, Redpath Raiseboring strengthens its own record for longest pilot hole ever completed in the Americas,” the company said, explaining the previous record of 845 m, also held by Redpath Raiseboring, stood for over a decade.
Once complete, this 875.1 m raise will be the largest, by volume, raisebore ever excavated in the Americas, and third largest ever globally, according to the company.
“As with all records, this fresh America’s accomplishment is meant to be broken,” Redpath said. “Redpath Raiseboring is nearing completion of a 1,009 m pilot hole slated for breakthrough toward the end of September, also in Canada.”