I'd like a mod that added large deposits of ore into the world generation rarely. I've tried some ore gen mods, but they aren't compatible with any mods that add new biomes, and they usually remove the default ore spawning completely, which, while a welcome difficulty spike, make it very hard to play, since you can't find the large ore veins easily. I mainly want this because I'd really like a good reason/way to make a realistic mine, with minecarts that are actually not only needed, but almost necessary and a whole setup for extracting the ore.
Other random notes:
-SMP would be nice.
-Possibly compatible with mods that add biomes, like ExtraBiomesXL.
-Maybe some way of detecting the deposits from the surface so you can dig down to it and have an open-air mine instead of working your way through caves every time you go to it (preferably something subtle and not always instantly identifiable though).
-Keeps the default ore generation, or at least still spawns tiny veins (Maybe smaller/slightly rarer than default?) so you can still find some iron in a cave when you first start if you look long enough.
So if anyone feels like doing this, go ahead. If not, don't worry about it. I figure I might as well through some ideas up here since there's no reason not to, really.