A ton is a ton is a ton. Total volume of a "cube " of ore will still be the same,but the amount of minerals will be higer if the averages are higher . For exampler, 2 % of nickel in a ton of ore will give you twice as much nickel as 1 %. Tonnage will increase however if some "cubes" of ore in the zone were previously excluded due to minimal /no econmic mineralization and if infill drilling finds these "cubes" in fact do contain economic mineralization. So much for my geology .