An unburnt part in the centre of a coal, piece of limestone, etc. (= dialect cowk: see coke, n.1, colk, n.1)
| 单词 | θ215537 |
| 释义 | society > occupation and work > materials > raw material > mineral material > [noun] > other mining products (4) corec1420 An unburnt part in the centre of a coal, piece of limestone, etc. (= dialect cowk: see coke, n.1, colk, n.1) slam1650 Refuse matter separated from alum in the preparation of this. concentrate1871 Mining. Ore or mineral matter from which less valuable or worthless material has been removed (cf. concentration, n. 4b). surfacing1890 Chiefly Australian. The action or process of extracting gold or other valuable minerals from surface deposits, esp. by washing. Also (concrete) a… |
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