I'm not available to add anything to the wikia that I saw last night, but as far as I can tell, there is a new ore generation system. The world, apon creation, will choose between these options for ores: Tin or Copper, Lead or Iron, Tungsten or Silver, Platinum or Gold, Palladium or Cobalt, Orithicalum or Mythril, and Titanium or Adamantium. Platinum crowns can be used for slime crowns, and most early ores have magic staffs associated with them and gems.