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Whenever you have a massive ore deposit (approximately 20 million tonnes or more) that is not too narrow, steeply dipping, or deep. Studies are done to determine at what depth a certain orebody is more economic to mine underground than open pit.
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∙ 14y ago
You might use an open pit mine when the mineral deposit is close to the surface and covers a large area, making it cost-effective to extract using large equipment. Open pit mining is often used for coal, iron ore, and copper mining operations due to the scalability and efficiency of the method.
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What determines whether an openpit or shaft mine is used?
Well since guy rather have a loos whole and usually guys will work in a mine they would use a open pit mine since it is bigger than a shaft ( small whole mine)
Why is open pit mining is used?
like strip mining open-pit mining involves removing the surface layer of soil. Miners then use explosives to break up the underlying rock and recover the ore. As they dig a deep hole or pit to mine the ore they build roads up on the sides of the pit. Trucks carry the ore to the surface. Ores of copper and iron are obtained by open-pit mining. (read in earth science book by Mcdougal Littell.)
Why are open pit mines used more?
There are some things that are difficult to mine via the open pit method. But when it is possible to apply the techniques of the open pit mine to recover rock and minerals, this mining type is good for basically two reasons. One is because it is relatively safer, and the other relates to the scale of the mine. We recover materials from the ground every day, and have done so for thousands of years. The open pit mine presents far fewer hazards than underground mining, and the reasons are fairly obvious. In a shaft or drift, there are many things that can go wrong and cause loss of life and/or equipment. There are far fewer in an "outdoor" mining activity as it is practiced in an open pit. The largest mines in the world are essentially big holes in the ground. These open pit mines use the economy of scale to produce materials, copper being one. The concentrations of copper are not high, so it is essential to move large volumes of ore to recover the metal in a manner that makes it cost effective on the site, and competitive on the world market to do so.
Which mine is a series of terraces that have been carved into the earth and raw ore is removed from that pit walls by use of explosives?
This is the open pit mine. Surveys are conducted (including drilling) and mapping is done. Then, with the location of the ore bodies pinpointed, material is removed, drilling and blasting create the ore pile, and the ore is loaded and hauled to the crusher. From there is it off to the processing plant.
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I am not sure how deep Martha mine is because every day at around 12:00 the miners use dynamite to expose more rock at the bottem of the pit so its depth changes every day.
What is the difference between open-pit mining and underground mining?
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
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