Imagine. You spawn in a world to see this huge mountain. You want a closer look. As you get closer you see lava falling from everywhere. "Oh whats this?" You ask yourself. You see ores of Coal,Diamond, and much more. You start to make a pick-axe. Within minutes your rich with ores.
I hope you enjoy my first upload here :)
To get this into your game you need world edit. Put this file in your 'Schematics' folder. Go into your world. Stand anywhere. The mountain will spawn a few blocks from you.