How much ore is needed to get one ounce of gold?

To produce one single fine ounce (= 31,104 g), 3,3 tons of ore, 5440 litres of water, 572 kilowatt hours electricity, 12 cubic metres of compressed air, lots of dynamite and tons of chemicals are used. After the gold-containing ore has been brought to light, it passes many more processing stages in a gold refinery, until the precious metal eventually reaches the state of absolute purity.