It goes without saying in EVE, skills matter, implants matter, better facilities matter.
I have no mining implants at this time and my skills are ok (not maxed).
The difference is 48,293 in Mexallon, at 70 ISK per unit is 3,380,510 ISK profit ONLY counting Mexallon, minus refining cost 991,958 = 2,388,552 more in profit.
Reprocessing V
Reprocessing efficiency V
Veldspar processing V
Plagioclase processing IV
Pyroxeres processing IV
Astrologeology V
Mining V
Mining upgrades IV