RE:Cost of Transportation?4 ton truck?? Not likely.
They'll probably be using something similar to this:
https://www.zmgkmachinery.com/productinfo1289 That truck has a 70 tonne capacity. If it's carrying 70 tonnes of 7g/t rock that's over $20,000 of gold. I really don't think the fuel is going to be a huge issue. Even if it used the entire 500 litre fuel tank for the trip it's not going to make a big dent in the profit margin ;)