Rocky Outcrop
Rocky Outcrop
In addition to mining, miners can use secondary tools to quarry items from patches of stone referred to as rocky outcrops. As in the case with Mineral Deposits, these locations are only discernible when using the action 
Prospect.
Quarrying
To quarry, you must first equip a sledgehammer to your off hand. Sledgehammers can be obtained from shops, market boards, or quests.