back of envelope calculations

Back of envelope calculations for CopperCO using only income from Copper production from Lady Anne

Production by December 25,000 metric tonnes
Copper in AUD/tonne less production costs =(AUD $8400-$2500 production costs) = $5,900 net /tonne X 25,000 tonnes = AUD$147,500,000.

Divide that by 861 million shares = $0.17 per share. That is 74% return per share based on todays SP of .23 cents/share.

Then by mid next year production rises to 30,000 metric tonnes pa and with the increased production the costs per tonne go down. Can someone check my rough calculations please.

Tell me again why this stock is at .23 cents?

Angers