He can be found in the tunnel under the sunken Tutorial Island.
During the Beneath Cursed Tides he will ask you to make bronze dagger. To make a bronze dagger: mine some copper ore and tin ore from the copper and tin rocks. Add the copper and tin ore to the furnace and close the doors. Operate the pump to pump out the water from the furnace, Light the furnace and then take the contents from the furnace to receive a bronzish bar. Use an anvil to make a bronze butter knife and bring it to the Mining instructor, he will be happy with your work and allow you to progress to the next tutor.