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Down-grade
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
- To classify a substance as lower quality than warranted.
- To reduce the value by the addition of a dilutent, as in adding waste rock to ore.
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Drifting, английский
- Deviating from the intended direction, such as a borehole during the process of drilling.
- Excavating a horizontal underground passage parallel to or along a vein or related structure.
- Straightening inward bulges in casing by using a special tool. see drift 5.
Down hole, английский
- A borehole drilled at any angle inclined downward in a direction below the horizon.
- In a borehole. compare down-hole equipment.
- Sometimes used as a synonym for bottom hole.
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