Something that overhangs; in Mining, The rock over the lode or vein; the ‘roof’.
| 单词 | θ6287 |
| 释义 | the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material above (10) hanger1631 Something that overhangs; in Mining, The rock over the lode or vein; the ‘roof’. grass1672 Mining. The surface of the ground above a mine. overburden1821 Mining. As a mass noun: overlying rock, clay, etc., which has to be removed in quarrying or mining in order to reach the deposit worked. Also as a… top wall1881 see quot. Subcategories:— above coal (4) — above other minerals (2) |
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