Total cost of gypsum supply and application per ton of pure CaSO 4.2H 2 0 = (35+25+10) × 18.6 ÷ 17 = $ 76.59 per ton. The total cost of gypsum in Australia 2. The ex-factory price of gypsum mined in New South Wales is $ 15 per ton, plus $ 40.00 per ton freight, which is $ 60.00 per ton at the farm gate, and $ 11.00 per ton to spread.
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