I was at Teck's line creek mine on Thursday. They have a sign at the guard house that says that mine alone consumed 27 million litres of deal last year. multiply this by 5 or 6 mines. tech buys a wack of feul. Teck got.into the oil sands to hedge their exposure on crude. they are western Canada's largest consumer of diesel. They also are not paying anywhere near the pump price. For starters they wouldn't pay the ~8cents in road tax.

Teck also uses a percentage of their fuel to blast with. I was told by an employee approx 1/3. The short answer is that's the low hanging fruit if your looking for optimization.