A shape having 12 symmetrical sides
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Tag: <span>D</span>
Non aqueous mineralized gravel deposit, usually an ancient channel, dry riverbeds or hillside
The assumption of an attainable average of mineralization by quantifying the mineralization found through results of well spaced representative drill samples
The assembly of a drill bit with a drill rod, alone or with more than 1 drill rods in succession
A completed setup including a drill, drill string, mount, power, required accessories and housing
The location and distance of a series of holes drilled for mineral exploration and testing
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