RE: Disappointed.8 Feb 2023 16:55
Shipping water in bowsers has a capital expenditure if you have to buy the bowsers (how many depends on water useage but small $ in comparison to rest of the project), operational expenses definitely. This has an effect on ESG unless you are going to buy/rent battery powered bowsers, extra trucking using diesel over piped water is a downgrade in ESG (again compared to rest of mine, but every bit od carbon counts these days). Mine sites are now starting to use battery mining vehicles, not only are they cheaper to run over LOM but they are tremendous advantage in underground mines as they can reduce need for ventilation using diesel vehicles. There is one ore transport on the market that does not even need charged, it is so heavy coming down hill it recovers more power than it takes to make the journey up hill. But battery vehicles are of course more expensive to buy upfront. Can all be part of net zero attempts by a mine.
Apart from the vehicles the site will be electrical and gas. I have no figure on how much water the plant needs daily but assumed that with an orignal wet tailings a good amount of water was used in the plant to process. The DFS talks about slurry, so well watered using brine and fresh water. There is a certain amount of brine that is not recoverable to reuse and so is discarded and hence more fresh water is added to the circuit. It is a water based circuit there is no doubt.....how much fresh water must be utilised a day is not mentioned. However, given the brine must be diluted with fresh water it cannot be salt water that is brought it, so it must be fresh. So where does the fresh come from if not the waste water plant. As it is secondary water then even if the country had new desalination plants they would just enter the system as primary use first and end up at the waste water plant anyway. Would once refined sewage be enough of a clean supply, I can see why golf courses love it though.
I am not saying it is not possible, hell we'll do what is required if needs be. In the grand scheme it's better then no water.