PHIL HILL / SCIENCE PHOTO LIBRARY PHIL HILL / SCIENCE PHOTO LIBRARY
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Mineral exploration drilling. Multi-combination drilling rig in use during a mineral exploration project. This rig uses hollow drill rods to cut a cylindrical core of rock from the ground for analysis. It is capable of both reverse circulation drilling and diamond drilling. Diamond drilling uses a drill bit encrusted with industrial diamonds to cut very hard rock, usually at great depths. The extracted core is analysed to find suitable sites for mining. Photographed in West Kenya.
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