Broken Tusk Mine is a dungeon in Skyrim: Dragonborn
Solstheim - Northwestern
The Broken Tusk Mine is found just to the East of Bristleback Cave. On your approach to the cave itself you will likely need to deal with a Riekling Charger who is standing guard outside of it with the help of at least 2 other Rieklings. Head to the ledge going East and follow that to the Mine's entrance.
Go down the stairs to find another Riekling Camp inside the mine. There is likely a Riekling
Head to the South and follow the walkway/stairs. Likely a Riekling will come charging at you just as you are starting the path.
Across from the bottom of the Ramp, you will find a Heart Stone Deposit. To the left of it you will find Riekling Hut, another Heart Stone Deposit in the Boar Pen and a chest past the hut.