I have been working on getting to be the first person to 99 mining!

and this is how I did it
1-25: copper and tin (kept for smithing)
25-50: iron (keeping for smithing as well

)
50-70: coal

70-85: mithril (great money

85-99: addy

or 25-40: ess

would suggest getting the best pick for ur level

I did copper and iron at varrok west
coal mith and addy at fally

GOOD LUCK

RACE YA!
