There are to many complications related to these projects because of it totally dependent on the government accept operations like this one.
One of the big problems is that governments do not understand how the mining process works, then there is the population that complains about the noise and then there are environmentalists in the region who complain about the pollution and finally the electricity company who complains about a very high consumption by the mining company. this will be a big problem for many years
since they were highly demanding much power that it could supply.
the high consumption of Electricity will always be the big problem, imagine a poor country like my country where without a mining company we have already gone bad with electricity deficit. We have no chance to build a very large mining company, the maximum we can do is build a small farm.