例句與造句

1. Mining the Treadwell site began by sluicing residual placers over the lode deposits.
2. The Americans set up huge dredges and mined primary lode deposits.
3. But the new gold discoveries are lode deposits _ minute concentrations of gold contained within rock.
4. By 1880, most of the mining had shifted to lode deposits, such as the Empire Mine.
5. Lode deposits were developed in the 1880s, as prospectors followed the gold to its source Swan River.
6. It's difficult to find lode deposit in a sentence. 用lode deposit造句挺難的
7. Besides panning and other gold-washing machines, efforts shifted to working the lode deposits, or gold-bearing quartz vein mining.
8. Prospectors traced the cerussite to its source, present day Leadville, and by 1876 had discovered several silver-lead lode deposits.
9. After the placer deposits were exhausted, mining turned to the lode deposits that were the source of the placer gold.
10. The Owyhee County began producing in 1863, and made over 1 million troy ounces ( 31 tonnes ), mostly from lode deposits.
11. Lode deposits are distinguished primarily from placer deposits, where the ore has been eroded out from its original depositional environment and redeposited by sedimentary forces.
12. In the Deflector and Deflector West Cu-Au lode deposits of the Gullewa Greenstone Belt, Western Australia, digenite is an important constituent of the transitional Cu-Au ore.
13. Miners may have been drawn to the area by news of lode deposits containing gold, silver, and copper along breccia and shear zones to the north of the wilderness area.
14. In 1878, lode deposits were discovered in the area, and the town of Virginia City was laid out in March 1879 . By the 1880 census, the town had a population of 1, 495.
15. The district was and is a major producer of gold from both placer and lode deposits : placers have produced over 8 million troy ounces ( 250 tonnes ) of gold, lodes have yielded over 4 million ounces.
16. Targets are divided into two general categories of materials : " placer deposits ", consisting of valuable minerals contained within river gravels, beach sands, and other unconsolidated materials; and " lode deposits ", where valuable minerals are found in veins, in layers, or in mineral grains generally distributed throughout a mass of actual rock.
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