Goron Mines - Piece of Heart Locations
There are two pieces of heart for you to find in the Goron Mines, both of which you reach by traveling up a magnetic floor and dropping down next to the chest. The first one is in a room near the entrance of the dungeon and is the only arguably difficult one to obtain here.
The second piece of heart is found later in the dungeon on the second floor in the same room as the Beamos towers. This piece of heart is much harder to miss than the previous since the chest containing it is right out in the open.
Goron Mines (Eldin Province) Seventh Piece of Heart
This piece of heart is found in a room that's just off of the main room of the Goron Mines dungeon. You can't get it your first time running through the room since you have to be on the ceiling to reach it, you have to enter the Elder Gorons room and then come back so you're on the second floor of this room.
The Heart Piece is found inside of a chest, as seen in my screen shot. If you're playing on the Wii keep in mind that your dungeon's map will be reversed from mine. Luckily all of the rooms look exactly the same so just use the pictures and my map for guidance!
Goron Mines (Eldin Province) Eight Piece of Heart
Much like the previous heart piece in Goron Mines this one requires you to travel across the ceiling with the Iron Boots and drop down nearby the chest that holds it. This Heart Piece is on the second floor of Goron Mines much later in the dungeon than the previous one.
In the room with the Beamos towers when you travel up the side of the wall you'll want to drop down onto the ledge that has a chest instead of the other side where you can drop the bridge. It's really easy to get and in plain sight. Use my pictures if you need help finding it!