A Rubiks Master

Ok, just double checking I'll be doing this correctly. Start my current world, MCEdit Copy from two set points in the world. Then stop the server. Delete the world file, start the server again, allow it to generate a new world. Then use the paste command? I'm just surprised that the Tekkit world will keep the clipboard stuff from world to world is all.

Would you say it would probably be easier to just MCEdit everything over to a new area that we know has new chunks (when we find rubber trees and etc)? Then just move the spawn point to that place for new players (we have a few RL friends wanting to join soon)

But there is no way to re-generate some of the chunks and just "protect" some stuff like houses that were made.

So, I recently replaced my vanilla minecraft server world into a new tekkit server. And after the headache that that caused, I finally get on to go mining and realized that none of the unique ores are in the ground or the gems, etc. And I understand, it generates a world, and when I generated it, it was in vanilla not tekkit, hence no ores. But I was wondering, is there a way to have it re-generate the ores/mines/everything underground? I have gone this far without cheating in the game and really want to work towards getting some of the end game items without cheating. It'd be nice to be able to build everything TL;DR - Is there a command for the server or a way to make it re-generate all the underground minable stuff without losing all the work everyone has on the surface. Thanks.