| 单词 | great blue lead |
| 释义 | > as lemmasGreat Blue Lead A gold-bearing stratum of bluish gravelly clay. Chiefly as the name (more fully Great Blue Lead) of a particular lode in California. ΘΚΠ the world > the earth > minerals > mineral sources > [noun] > strata containing minerals fuller's eartha1350 fulling eartha1399 fulling clay1647 second bottom1787 iron pan1811 ledge1847 blue lead1854 oil shale1866 oil sand1875 Cambridge coprolite1881 Cambridge greensand1882 gem-bed1886 1854 Mining Mag. 2 655 The shaft of the United States Company.., having been sunk to a depth of 196 feet, in search of the Blue lead, at an expense of over $7,000, is completed. 1872 Anglo-Amer. Times 13 Apr. 12/2 The lower strata, or Blue Lead, is by far the richest, generally returning from five to ten-fold the amount of gold obtained from the upper strata. 1908 W. R. Crane Gold & Silver iii. 306 The blue lead varies in thickness from a few inches to 100 feet, and is generally considered to be not only the richest but the most important and reliable gold-bearing gravel deposit in the state. 1931 Calif. Hist. Soc. Q. 10 394 Alleghany..developed after the great ‘Blue Lead’ had been discovered on the other side of the Oregon Creek divide from Forest City. 1999 M. Hill Gold viii. 133 Early miners weren't hoping to find the ‘Mother Lode’—that term didn't come into vogue until the 1860s. They were looking for the ‘Great Blue Lead’. < as lemmas |
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