I think you are confusing transaction accounts with loan products.
I expect that if not already held - and i suspect KNL do hold them - Kibaran will have accounts in Australia, Germany, and Tanzania. Multiple accounts with multiple purposes. Local transfers will be much cheaper when they go from Tanzanian account to Tanzanian account. This is where Epanko is located after all. It is smart, sensible business.
As for the KfW loan, yes, the idea is to spend the money in Tanzania, building the mine. There's equipment, wages etc to pay for.