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单词 prospecting shaft
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prospecting shaft
prospecting shaft n.
ΚΠ
1857 W. P. Blake in Rep. Explor. Mississippi to Pacific Ocean V. 272 A ‘prospecting’ shaft is first sunk from the surface of the bed-rock, and the earth tested.
1880 Daily Tel. 3 Dec. Hundreds of men..began to sink what are called ‘prospecting shafts’, and a vast amount of low grade mineral was brought to bank.
1999 Jrnl. Southern Afr. Stud. 25 92 Jobs, which they generally performed on the small mines beyond the Reef, and in prospecting shafts.
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