Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Rethban Ore

NPC Level Zone Chance

Redridge Drudger 20 - 21 Redridge Mountains 33.8%
Quest Level Side

Rethban Ore 24 Both
Object Zone Chance

Copper Vein Redridge Mountains 40.0%

Tin Vein Redridge Mountains 41.0%

Object	Zone	Chance
Copper Vein	Redridge Mountains	40.0%
Tin Vein	Redridge Mountains	41.0%