Well, the mine rights and SIRG stock are two separate issues.
If Monaco held 80% interest in the mine then they would hold majority and could mine it, sell it, whatever. SIRG should still receive 20% of whatever profit that Monaco generates.
To make any changes to SIRG, Monaco would have to hold controlling interest (over 50%) of SIRG stock with voting rights.
In other words, only buying the mine gives Monaco no control over SIRG.
I would assume that if Monaco bought 80% from Grand View, they would also want to buy the remaining 20% from SIRG outright and not obtain it through taking controlling interest of the company.
In either scenario, Monaco buying 80% interest in the mine would be a good thing for SIRG.
