it doesnt matter how many times you click to get the skillgain
it is determined by the value of the deposit
so a 100ped lys will give you same mining skills as a 100ped kanerium.
at least this was new to me since im not the hardcore miner.i noticed this when i hit a massive alferix and gained about 80 lvls in mining from 1960 to 2040 thou extracting alferix took me like 20 uses.
so dont try to fool yourself when you get a lyst global with "at least i get some more mining skills"
i think im not the only one who didnt noticed this before