SimpleOres adds 5 new ores to the base game: Copper, Tin, Mythril, Adamantium and Onyx. All except Onyx can be found in the overworld, while Onyx can be found only in the Nether. Each ore has its own unique properties, armor and tool sets, and more.
Required Libraries: Simple Core API and, for late 1.10.2 and 1.11.2 or later, CompatLayer.
Please see http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1279863-simpleores-2-by-alexndrthegr8st for information.
Alexndrthegr8st's original work (All Simple Ores/Simple Core code up and including SimpleOres2 1.7.1 for Minecraft 1.8) is licensed as per the Forum thread above (requires simple attribution). Sinhika's later, derived work, with Alexndrthegr8st's permission, is now licensed under LGPL 3.0. Go wild, modpack makers!