Methods of Drilling in Mining – Industry Review by GRT
2021-4-6u2002·u2002The special tube is a core lifter case and cores collection ensues for examination. A core drill uses a mechanism designed to rotate. This rotation causes an annular-shaped rock-cutting bit to penetrate rock formations. A core is the sample rock obtained through the use of a hollow drilling bit, which cuts and retains a section of the rock ...
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