The location and distance of a series of holes drilled for mineral exploration and testing
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Tag: <span>D</span>
A gear powered drilling hand tool
An access passage through rock, used for transportation and usually following a length or zone of mineralization
An underground opening at the bottom of a stope where broken ore is collected
To recover heavy minerals from depth, with a device that employs a vacuum to first collect material and a further device or series of devices, to classify and concentrate minerals of greatest density