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Chocolate Wood - because bacterial
If the coal company imposed the depth limit on themselves, they must have deemed it economically unproductive at depths greater than 250 feet.
Shaft mining.
Shaft mining.
This would be underground mining.
Surface mining is MUCH less expensive than underground mining. Usually. In some cases, underground mining is used because the substance being mined is just too deep to have a surface mine. I was just in a silver mine that is more than 5,000 feet deep. If the mine had to remove a mile of rock to get to the silver, it would not be worth mining. In THAT case, underground mining is less costly.
Companies that would use data mining software would be grocery stores that want to monitor how the sale pattern differs at each location on certain items. Another company that uses data mining would be the Walmart corporation.
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The Apple industry
it would depend on size and weight
No. We currently to not have the technology for interplanetary mining. All mining takes place on Earth. Venus is particularly inhospitable due to extremely high pressures and temperatures at the surface, so if we were to start mining offworld, we would probably go to Mars or to asteroids instead of Venus.
The gold rushes existed because gold was first found on the surface. Much of the gold was extracted by panning . Actual mining , digging deeper , came later.
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Chocolate Wood - because bacterial
Unfortunately not. If a company or person owns the mineral rights on a piece of private property they have the right to extract that mineral at their discretion. However, they do need to compensate the land owner for any damage or inconvenience that may arise from the mining. There is a standard for deciding that monetary amount. That standard would be state specific.
I was searching for an answer for my science homework, when I stumbled upon this answer. This was very incorrect, and I would like to fix it for you. Here is the correct answer: Open Pit Mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow.Hope this helps!-Jane Derdoy