As we already mentioned, among these challenges are water quality, impacts on biology, on organisms; how to reduce the amount of energy that is needed to break down rocks; waste reduction, etc. As I already said, we have come up with some very interesting solutions.
I will give you the example of a project that was carried out in Sudbury, but the concept can be applied elsewhere. They combined the waste from a mine to that from the city of Toronto, for instance, in land that had not been used before; afterwards, they grew plants to be used in the production of biofuel. In short, they used two types of waste in a field that had never been used before and thus had little value, and this led to something concrete that we will be able to use to reduce energy consumption.