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Placer mining
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What kind of mining would early prospectors use to extract shallow deposits of ore?
Placer Mining.
What are 3 mineral sources?
2. To identify the changing patterns of the ore deposits of the early Earth.
How are deep underground deposits of oil and natural gas are located?
See related link which is only related to US wells. The depth at which hydrocarbon deposits are found varies greatly. Very shallow deposits of less than 100 feet were found in the early days of exploration. Today, it is not uncommon to drill to 10,000 feet or more, although the US average depth is 5600 ft for oil and 5700 ft for natural gas. We have the technology to drill to 15,000 to 20,000 feet and if conditions are right even deeper. However, the high temperatures may preclude finding oil. The high cost of drilling may make development uncommercial unless a very large deposit is found. The challenges today are not only to find new deposits at deeper depths in the ground, but to drill wells and erect production platforms in deep water. The deepest well was drilled to 37,000 ft in Russia in 2003.
What do Proterozoic-aged red beds and banded iron formations tell us about the Earth's early atmosphere?
Banded iron formations indicate that there were oxygen-rich and oxygen-poor episodes during Earth's early atmosphere. Banded iron formations first appear in the Archean, 3 billion years ago. Unbanded iron deposits (red beds) from the Proterozoic, 1.8 billion years ago, indicate that the atmosphere became oxygen rich and that oxygen-poor episodes were no longer prevalent.
Why oxygen and carbon dioxide are not the most abundant gases in the atmosphere?
Oxygen readily combines with many other elements, carbon (CO2), hydrogen (water), iron (rust), etc. So absent photosynthetic life we would not expect there to be much oxygen in any atmosphere. CO2, on the other hand, ought to be fairly high, and it most probably was early in earth's history. However, living organisms began pulling the CO2 out of the atmosphere, cracking it, and releasing the O2. The carbon taken up by these marine organisms was incorporated into their shells and exoskeletons. When they died they sank to the sea floor, forming vast chalk and limestone deposits over hundreds of millions of years. Much of the early earth atmospheric CO2 ended up in limestone deposits. This left nitrogen as the most predominant gas.
What kind of mining would early prospectors use to extract shallow deposits of ore?
Placer Mining.
What was the name given to early prospectors who came to California?
Forty-Niners
What major difficulties would the early gold prospectors have faced in Australian Gold rush?
Some of the major difficulties that the early gold prospectors had faced in Australia during the gold rush included cultural conflicts and a lack of housing. Often, people of different cultures would fight and even kill other prospectors.
How did early prospectors use density to determine whether they had found gold or pyrite?
Specific gravity.
Why were early seamen afraid of the sea?
the sea was too shallow
How did early bacteria in the earths shallow seas contribute to the development of life on earth?
They PHOTOSYNTHESIZED
Who was the early explorer that set up a plantation that relied on slave labor to extract gold?
The early explorer who set up a plantation relying on slave labor to extract gold was Christopher Columbus. He established the first Spanish colony in the Americas on the island of Hispaniola (now Haiti and the Dominican Republic) and implemented a system where indigenous people were forced to work in mines to extract gold.
What are mineral's sources?
2. To identify the changing patterns of the ore deposits of the early Earth.
What are 3 mineral sources?
2. To identify the changing patterns of the ore deposits of the early Earth.
Why was to difficult for large trading ships to dock near the coast of California in the early 1800s?
Shallow water.
What contributed most to the settlement of California in the late 1840s and early 1850's?
the discovery of mineral deposits
What time does Fidelity post direct deposits?
Between 8-10 am eastern standard time a day early.
