I'm not here to do the work for you, I gave you the facts and numbers, their FOB operation cost will be higher than the price they can get for the initial phase of mining for the low grade nickel/high grade Fe from what I've gathered so it isn't viable (as a lot of us have been telling you) but once they've mined those ores on the surface and dig 5-10M, they will start to make a profit from those higher grade ores and that's when it will be economically viable.
But they will make a loss in the initial phase of mining (they can't afford that) so there is no-way they will be able to pay back any of the $20M startup capital during those few years, plus the loss incurred during that initial mining phase.
I can do a better analysis if they had produced a JORC and then PFS for SJ.....