The Bronze Firebeast is definitely NOT Erathsmedor. He's much further in. The firebeast is a machine that you have to disable to get further into the mountain...but first you have to have Dragon Armor from the Stout Mines.
Regarding the spare parts: On the 2nd big level of the Abandoned mines (the one where the elevator opens into a passageway that branches in 3 directions) take the pathway to the left. Then take the first room to the left. You'll see a lot of tombstones and the narrator will comment on them being out of place. On the left side of the room you'll find a broken cart. Right next to the cart is a seemingly useless rod. Pick it up; it's the trolley lever.
-Sazerac
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