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The wooden ‘bread’ layers of the sandwich keep the sheet metal flat and prevent the drill bit from wandering as it bores through the sheet metal. Step drill bits are designed to drill holes in ...

A snowmobiler accidentally drove into a vertical mine shaft and dangled 20 feet above the bottom, Utah rescuers said.

“This person and his snowmobile were hanging about 20 feet above the bottom of the shaft,” rescuers said. “The injuries and very remote location required immediate evacuation via Lifeflight.” A photo ...

Samples from the drill core are split into half sections on site. Where possible, samples are standardized at 0.5m down-hole intervals. One-half of the split sample is sent to SRC Geoanalytical ...