OSRS Mining Guide 199 PlayerAuctions
Especially the prices of items. Adamantite ore isn't what it used to be and isn't great for moneymaking. But, if you want to do it, head for the Mining Guild or the Dwarven Mine at 70 Mining. Mining adamantite ore will be slow for a while since you're doing this as soon as you unlock the ore. Mining and banking iron ore would be better.