Redpath Raiseboring completed another record-breaking hole last week at Kirkland Lake Gold’s Macassa Mine. At a length of 3,312 feet (1,010 m), this raise became the longest raisebore hole ever accomplished in the Northern Hemisphere and all of the Americas. This concludes the first of the planned twin, 12-foot diameter ventilation raises extending from surface down to 5617 Level. The hole was accomplished in two stages with two machines drilling concurrently; a Redbore 70 underground and a Redbore 90EX on surface, completing individual ventilation raises of 2,167 feet (660 m) and 3,312 feet (1 ,010 m) respectively. The Redbore series raisebore machines were designed and manufactured in-house by Redpath in North Bay, Canada. For more information, please click here.