[Answer] When would miners use an open pit mine?

Answer: when the ore deposit lies close to the surface
When would miners use an open pit mine?

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Open-pit mining also known as open-cast or open cut mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open-air pit sometimes known as a borrow. This form of mining differs from extractive methods that require tunnelling into the earth such as long wall mining. Open-pit mines are used when deposits of commercially useful ore or rocks are fo…

Open-pit mining also known as open-cast or open cut mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open-air pit sometimes known as a borrow. This form of mining differs from extractive methods that require tunnelling into the earth such as long wall mining. Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface. It is applied to ore or rocks found at the surface because the overburden is relatively thin or the material of interest is structurally unsuitable for tunnelling (as would be the case for sand cinder and gravel). In contrast minerals that have been found underground but are difficult to retrieve due to hard rock can be reached using a form of underground mining. To create an open-pit mine the miners must determine the information of the ore that is underground. This is done through drilling of probe holes in the ground then plotting each hole location on a map. The information gained through the holes with provide an idea of the vertical extent of the ore’s body. This vertical information is then used to pit tentative locations of the benches that will occur in the mine. It is important to consider the grade and economic value of the ore in the potential pit. Open-pit mines that produce building materials and dimension stone are commonly referred to as “quarries.” Open-pit mines are typically enlarged until either the mineral resource is exhausted or an increasing ratio of overburden to ore makes further mining uneconomic. When this occurs the exhausted mines are sometimes converted to landfills for disposal of solid wastes. However some form of water control is usually required to keep the mine pit from becoming a lake if the mine is situated in a climate of considerable precipitation or if any layers of the pit forming the mine border productive aquifers. Open-pit mining is to be considered one of the most dangerous sectors in the industrial world. It causes significant effects to miners health as well as damage to the ec… Read more on Wikipedia

Open-cast mines are dug on benches which describe vertical levels of the hole. The interval of the benches depends on the deposit being mined the mineral being mined and the size of the machinery that is being used. Generally large mine benches are 12 to 15 metres thick. In contrast many quarries …

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