placer deposit वाक्य
उदाहरण वाक्य
मोबाइल
- Heavy mineral sands are placer deposits formed most usually in beach environments by concentration due to the specific gravity of the mineral grains.
- It is likely that the earliest deposits were alluvial and perhaps exploited by the same methods used for panning gold in placer deposits.
- Often placer deposits are found within sedimentary rocks and can be billions of years old, for instance the Witwatersrand deposits in South Africa.
- The disruption of old gold placer deposits risks the reintroduction of post gold rush pollution, including mercury in old mining deposits and mine tailings.
- Among the earliest gold discoveries in Colorado were placer deposits near the headwaters of the Arkansas River in Twin Lakes, no longer in existence.
- The legend of the golden fleece may refer to the use of fleeces to trap gold dust from placer deposits in the ancient world.
- Subsequent gold discoveries at Rocky Bar in 1863 and placer deposit of niobium and tantalum in the United States is located in Bear Valley.
- 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.
- Hardrock gold deposits are more varied in mineralogy and geology than placer deposits, and prospecting methods can be very different for different types of deposits.
- Among the earliest gold discoveries in the Colorado gold rush were placer deposits discovered in 1859 at the headwaters of the Arkansas River near Granite.
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