| 单词 | placer mining |
| 释义 | > as lemmasplacer mining placer mining n. ΘΚΠ society > occupation and work > industry > mining > [noun] > other specific types of mining shoading1778 nuggeting1852 placer mining1852 reefing1859 hydraulic mining1873 stripping1874 drift mining1877 gouging1877 hydraulicking1880 open-working1881 strip mining1935 horizon mining1947 roadheading1969 1852 Daily Commercial Reg. (Sandusky, Ohio) 21 Dec. The capital invested in placer mining is $710,900. 1872 R. W. Raymond Statistics Mines & Mining 192 In the great placer-mining region of Idaho there is an underlying basis for permanent mining. 1992 R. M. Bone Geogr. Canad. North ii. vi. 137 Placer mining involved the recovery of auriferous deposits found in stream beds by simple and inexpensive technology. < as lemmas |
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