Thorium Brotherhood Reputation Guide
The Thorium Brotherhood Reputation is one of the "raid" reputations in Classic WoW. Raising this reputation will grant you access to many different rare crafting recipes that you can't get anywhere else and that are extremely beneficial such as the Dark Iron Fire Resistance set and the 2h Axe Nightfall.
You'll find the hub for the Thorium Brotherhood reputation in both Thorium Point located in Searing Gorge and inside Blackrock Depths at the Grim Guzzler. Almost all of the recipes for this faction are sold in BRD but you'll be using the NPC in Searing Gorge to raise your reputation with this faction up to Honored.
By doing all of the quests available to you from Thorium Brotherhood you will get roughly 2000/3000 through Neutral. Items you can collect and turn in for reputation are below.
Neutral to Friendly
Turn in Incendosaur Scales + Coal and either Heavy Leather, Iron Bars or Kingsblood.
Depending on what of the 3 "extra" items you do here will determine how much you will need. By default you will need 240 Incendosaur scales and 120 Coal. For the extra items, 1200 Heavy Leather, 480 Kingsblood or 480 Iron Bars. Heavy Leather and Kingsblood are usually the easiest to do this with.
Friendly to Honored
Turn in Dark Iron Residue
Dark Iron Residue drops from trash mobs all over BRD. This crap is very easy to get and you will only need 960 in order to go from Friendly to Honored. It will take roughly 3-4 BRD runs depending on how much you clear.
Honored To Exalted
Turn in Dark Iron Ore, Core Leather, Fiery Cores, Lava Cores or Blood of the Mountain.
Dark Iron ore can be mined up from Searing Gorge, Burning Steppes, BRD and MC. Blood of the Mountain is a rare gem drop from Dark Iron Nodes. The other 3 tiems, Core Leather, Fiery Cores and Lava Cores all come from Molten Core. Fiery and Lava Cores are random drops off Trash in MC and Core Leather can be skinned from the Core Hounds.
All of these items get turned into Lokhtos Darkbargainer in BRD. He is located in the Bar section of BRD. All of the items to take you from Honored to Exalted are listed below, with how much you need, how many are required for a turn in and how much rep they give.
Dark Iron Ore
x10 = 1 Turn in
75 Reputation per turn in, unless you're human
6600 Ore to go from Honored to Exalted
Core Leather
x2 = 1 Turn in
375 Reputation per turn in, unless you're human
348 Core Leather to go from Honored to Exalted
Fiery Core, Lava Core, Blood of the Mountain
x1 = 1 Turn in
500 Reputation per turn in, unless you're human
66 Cores or Blood of the Mountains from Honored to Exalted
The Fiery Cores, Lava Cores and Blood of the Mountain is the easiest way to go from Honored To Exalted.