Dinesh_college Posted September 13, 2005 Report Posted September 13, 2005 We take lots and lots of matters(like gold,iron,..) by mining activities. How the gaps are filled? Quote
nkt Posted September 13, 2005 Report Posted September 13, 2005 With open cast mines, they aren't, unless they get used for landfill later. Generally they turn into lakes. With regular mines, the tunnels are propped up by beams, and water is pumped out continuously. Once the mine closes, the pumps are turned off, and it all floods, the beams eventually fail, and you get subsidence issues. This is a big thing in some areas of the UK, as the ground shifts and your house falls down, or it rains and a 30ft across hole appears overnight. Quote
Chacmool Posted September 13, 2005 Report Posted September 13, 2005 The unused mines can also become tourist attractions. An example is the so-called "Big Hole" in Kimberley (South Africa). Mined to a depth of 215 metres, and with a surface area of about 17 hectares and a perimeter of about 1,6 km, it is the largest hand-dug excavation in the world. On 14 August 1914 work on the mine was suspended. By that time 22,5 million tons of earth had been excavated, yielding 2 722 kilograms of diamonds. nkt 1 Quote
nkt Posted September 13, 2005 Report Posted September 13, 2005 Wow! We could fill the mine with tourists... how many to the ton? Either way, that's a lot of tourists. :hihi: Quote
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