Best case scenario - Vale digs and deterimines the in-situ value is very much like Zambia belt. They get 80% / KATX gets 20%.
So what would 20% of a zambia belt-like discovery be equivalent to?
Zambia has produces 400,000 to 700,000 tons per year of copper. Say that Lucky is 10% of that (to be conservative).
Do the math. If KATX gets 20% of 400,000 tons x 10% = 8,000 tons per year x $5,800/ton (current price is 2.93/lb) that is $46 million per year for KATX.