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Niggerhead
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
- A cathead or small capstan.
- A hard, flintlike, dark-colored rock nodule, boulder, or rounded field stone.
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Nonproductive formation, английский
- A rock unit that, because of its stratigraphic position, is presumed to contain no valuable mineral deposits.
- A rock unit in which no minerals of interest are found.
Mud up, английский
- The act or process of filling, choking, or clogging the waterways of a bit with consolidated drill cuttings. also called sludging, sludging up.
- The act or process of filling the pores or cracks in the rock surrounding a borehole; also, to cause mud to adhere to the walls of a borehole. compare mud off.
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