You mention knocking $10/t off, I assume you are talking about the selling price of $140/t in the top of the spreadsheet? If so, further down the excel spreadsheet I have input the cash flow and profit figures based on lower FE prices.
I think a PE of 6, based on FE price of $130 gives a market cap of $2.4b or $2.64 per share.
The depreciation figure is from the following presentation on slide 23; http://www.asx.com.au/asxpdf/20120827/pdf/4288c2pjswfcp6.pdf
Also note that I have input a higher cash cost than the upper range of the guidance.
AGO Price at posting:
$1.67 Sentiment: LT Buy Disclosure: Held