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The current amount of copper at 60,000 tonnes at $7000 per tonne is valued at $420 mil. If the aerial survey reveals 10 times that (only 4 km of 50 km had been evaluated previously, a very rough assumption that the percentages doesn't change) would yield an ore body worth 4.2 billion. If the company profits are 25% then 1 billion US isn't too bad.

The announcement hints at good results so our hopes can remain up, just wait 6-8 weeks for the final result.