| 单词 | development rock |
| 释义 | > as lemmasdevelopment rock development rock n. Mining rock extracted during the opening and development of a mine, typically consisting of a mixture of barren rock and low-grade ore. ΚΠ 1899 Afr. Rev. 27 May 359/1 The development rock is of low grade, and is sent to the mill owing to the present scarcity of native labour. 1954 Times 23 Nov. 12/2 We are at present re-examining several dumps of development rock containing in the aggregate a considerable tonnage of low-grade ore. 2010 G. Blight Geotechn. Engin. Mine Waste Storage Facilities i. 16 Plate 1.4 shows a dump of waste quartzite development rock from a South African gold mine which was built by conveyor and stacker. < as lemmas |
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