Ann: Operations Update, page-368

Yeah of course they did with their calculations. That is completely unrelated "champ". I was just referring to a point chillaxed made about pressure in the HRZ . Point taken BTW pony boy and chillaxed, therefore the pressure differential is negligible in the zone. FYI "next" ( is that a term you hear a lot mate?) whether the substance is in a vapour phase or not, it is still affected by gravity, the pressure inside a lpg bottle (59m deep mind you) will still be higher at the bottom, whether it's deemed negligible for calculation purposes. Enuff sed Mt Druitt?