My suggestion is an extension to the mining guild. The expansion will be in an entirely new level of this guild, requiring 85 mining to access, but it OSRS gold would not affect the original guild. This extension could have 5 runite rocks, 11 adamantine stones, 14 mithril rocks, and 25 coal rocks. Also from the new addition are a dwarf which sells dragon pickaxes, enchanted pickaxes, and mining rings.
Enchanted pickaxes price 50k and get any ore in a couple of strikes but can only get 50 ores prior to breaking. When broken, bring it to the dwarf in the mines to fix it for a charge of 10k.
Mining rings would prevent enchanted selections from breaking but when the 50 ores were consumed, the enchanted choice would act as a rune choice until the following day. For almost any other choice (except dragon) it might be a one-up on the pick (ex: bronze would act as iron, etc;-RRB-. It would not turn a rune pick to a dragon select but it could give it a particular that may be used once every day. They'd cost 20k.
Dragon pickaxes are 640k. They'd have two specials, one for mining and battle. Its combat particular would drain the entire bar and hit the opponant with a stronger, more accurate attack and would entangle the opponant for 15 minutes. Its mining unique would drain Buy runescape 3 gold the whole bar. It'd get the ore in 1 hit and could get two ores. The mining guild would also have a deposit box to deposit ores. Any comments/suggestions are appreciated.