Yep, I used there prodcution graph, about $100 dollars a tonne sale price deducted a reasonable production cost. Took 50% of the profit as dividends and did a discounted cash flow over 10 years on them. I used 50% as ken talbot had done that at other companies.
Thats the way I was taught how to calculate the worth of companies.
Hope its correct I need to buy a house!! someone the other week I think had a buck 84.