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  2. Underground mining is used to extract ore from below the surface of the earth safely, economically and with as little waste as possible. The entry from the surface to an underground mine may be through a horizontal or vertical tunnel, known as an adit, shaft or decline.
    www.angloamerican.com/our-stories/innovation-and-technology/digging-deeper-mining-methods-explained
    www.angloamerican.com/our-stories/innovation-and-technology/digging-deeper …
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  3. People also ask
    What are the challenges associated with deep underground mining?Challenges associated with deep underground mining are numerous, including: excavation stability, rock-stress risk reduction, mine ventilation, underground productivity, human health impacts, human-machine interaction and smart mining.
    What is the deepest underground mine in the world?The deepest tunnels currently reach 2.4 miles into the earth’s crust, with plans to dig even deeper in the works. The largest and most productive underground mine in the world is the Kiruna Mine, located in northern Sweden. It produces a staggering 26 million metric tons of iron ore annually.
    What is deep underground mining?Underground mining has historically occurred in surface and near-surface (shallow) mineral deposits. While no universal definition of deep underground mining exists, humanity's need for non-renewable natural resources has inevitably pushed the boundaries of possibility in terms of environmental and technological constraints.
    Is deep mining at 1000 m normal?At present, deep mining at 1000 m is normal; the depth of coal mines has reached 1500 m, the depth of geothermal exploitation has reached more than 5000 m, the depth of non-ferrous metal mines has reached around 4500 m, and the depth of oil and gas exploitation has reached around 7500 m. Deep mining will become common in the future.
    What is considered a 'deep' mine?Underground mines routinely reach 1000 m; anything below this could be considered ‘deep’. Depths of ~2000 m were rarely reached even a few decades ago, but they are now becoming increasingly common. Challenges start to grow exponentially as you push deeper than about 2000 m; venturing below this can be considered ‘ultradeep’ mining.
    Where did underground mining come from?One of the earliest examples of underground mining dates back to ancient China where coal was dug out from early shaft mines to be used for metalworking. In Roman times, underground mining was conducted in Britain and elsewhere in the pursuit of metals such as copper, nickel, tin, and iron.
     
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