Waste material removed during mining, quarrying, or civil engineering operations; (North American) surface material overlying a placer deposit.
| 单词 | θ6289 |
| 释义 | the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material above > above other minerals (2) muck1883 Waste material removed during mining, quarrying, or civil engineering operations; (North American) surface material overlying a placer deposit. roof1931 Mining and Geology. The stratum lying immediately above a coal seam, orebody, or other formation; the top of a working or gallery. |
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