The modification adds new ores to the game: Rubies, Fossilized Remains, Chrysocolla
Rubies are a common ore that can be used to craft tools.
Rubies spawn from height 27
The fossilized remains are excellent fuel for the furnace.
There are two types of ore: Fossilized Ore and Very Fossilized.
The first ore spawns from height 23, and the second from height 13
Chrysocole is also a common ore, but the chrysocola sword poisons mobs.
The mod has its own line of achievements that will not let you get bored! :)