Silverton native Terry Rhoades works a jackleg drill while competing in the single man drilling competition at the 50th Hardrockers' Holidays in Silverton on Saturday, Aug. 10, 2024. (Photo by ...

the new drill attachment is far superior to the alternative for drilling in cramped spaces, jackleg drills. The Brokk/TEI combination eliminates fatigue caused by operating the heavy handheld ...

using pneumatic drills like the jackleg drill pictured here. The blasts would fracture the ore, making it possible to load it onto underground railroad cars for transport to the top. According to ...