We are putting $15 a share worth of materials on the table. That's just the prices and pounds as listed. Then deduct all the costs at 25% then subtract $340 million since that goes directly to the capex. After that you can add the bonuses.
For the premium take into account the report on long term projections for large deposits. Out of the 100 listed only 7 of those have a chance of being mined this decade. 3 are in Canada. Only these three have a stability factor of +5. Arizona and Auz are +4 and Az has 5 and Auz has 4. The dozen or so likely mines do not make up enough supply. We will have to see the 3 other giant brought on line but those countries know that and they will strong arm the builders.