I don't believe water is a problem but even if it were then it...

I don't believe water is a problem but even if it were then it seems to me that the magnesium market is so tight that consumers and processors will be more than willing to accept magnesite if it is diluted with water.
After only a year or two of production Korab could be buying a processing plant in cash, which then would solve a whole lot of problems. For comparison see the MGX PEA:
https://www.mgxminerals.com/investors/news/2018/330-mgx-minerals-announces-positive-pea-for-driftwood-creek-magnesium-pre-tax-npv-of-c-529-8-million-and-24-5-irr.html

Korab has plenty of room for potential extra production as the company has about 1 billion tonnes of magnesite.