RE:MARI and FILLOL, MARI is a good company, and probably a winner in this copper commodity cycle. I looked at them, and it was actually through a MARI Investor Presentation that I found the Filo Del Sol deposit.
I went FIL because the gap between share price and deposit NPV was higher, and because its backed by the Lundin's, who have a long and successful history finding deposits and turning into mines.
Couldn't fault anyone interested in copper for having some MARI, the whole Oxide over Suphide angle is similar to FIL.
Good luck