I'm not sure if the ore gen was doubled compared to vanilla when Hexxit first came out, but I do know that Canvox made it the same as Big Dig: he made ores spawn without depth restriction. Diamonds and redstone could be found on the surface
I believe that's what people mean
Edit. wow, just stumbled on the weirdest bug. When a meteorite strikes and you hit 'm' for world map, then close it, you hear the meteorite strike again. Clicking the world map yet again and closing it repeats the sound.
