Mining and Geology. Bed-rock: see quots.
单词 | θ6301 |
释义 | the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > bed rock (2) shelf1671 Mining and Geology. Bed-rock: see quots. reef1869 Mining (originally Australian). In later use chiefly South African. Unproductive bedrock surrounding gold- or diamond-bearing materials; gangue… |
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