| 单词 | costean pit |
| 释义 | > as lemmascostean pit A pit or trench sunk through surface deposits in order to locate a vein of ore and ascertain its extent. Also costean pit. ΘΚΠ society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > excavated area > in order to find direction of lode costean1778 1778 W. Pryce Mineralogia Cornubiensis (Gloss.) 319 Costean pits are shallow pits to trace or find Tin. Costeaning, ditto. 1851 Hull Packet & E. Riding Times 29 Aug. 1/2 The back of the lode, which has been opened upon by Costean pits at the surface for some considerable distance, is of immense size. 1896 Westm. Gaz. 20 Apr. 8/1 A costeen has exposed the cap of a reef 4 ft. wide of solid quartz. 1920 Glasgow Herald 31 Mar. 11 The White Hope..has been opened up all along the line of lode by costeens. 1964 A. Nelson Dict. Mining 109 Costean, (1) A trench cut across the conjectured line of outcrop of a seam or orebody to expose the full width. (2) The channel eroded by a flow of water to expose mineral deposits during prospecting work. 2001 G. Taylor & R. A. Eggleton Regolith Geol. & Geomorphol. xv. 310/1 Open cuts range in size from shallow bulldozer scrapes a few metres deep to large costeans up to 30 m deep. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。