Simply that ^^^.

 

Ill paste my generation code here...

 

package IndustrialBreakout.world;

import java.util.Random;

import IndustrialBreakout.mod_IndustrialBreakout;
import net.minecraft.world.World;
import net.minecraft.world.chunk.IChunkProvider;
import net.minecraft.world.gen.feature.WorldGenMinable;

import cpw.mods.fml.common.IWorldGenerator;

public class WorldGeneratorIB implements IWorldGenerator {
        @Override
        public void generate(Random random, int chunkX, int chunkZ, World world, IChunkProvider chunkGenerator, IChunkProvider chunkProvider) {
        	for(int i=10;i<=32;i++){
        		world.setBlock(chunkX*16 + random.nextInt(16), i, chunkZ*16 + random.nextInt(16), mod_IndustrialBreakout.oreTitanium.blockID);
        	}
        	for(int i = 32; i <= 64; i++){
        		world.setBlock(chunkX*16 + random.nextInt(16), i, chunkZ*16 + random.nextInt(16), mod_IndustrialBreakout.oreCopper.blockID);
        	}
        	for(int i = 10; i <= 32; i++){
        		world.setBlock(chunkX*16 + random.nextInt(16), i, chunkZ*16 + random.nextInt(16), mod_IndustrialBreakout.oreTin.blockID);
        	}
        	for(int i = 5; i <= 16; i++){
        		world.setBlock(chunkX*16 + random.nextInt(16), i, chunkZ*16 + random.nextInt(16), mod_IndustrialBreakout.oreChargedCoal.blockID);
        	}
        }
}

Quite simply, you are not checking to see if it is a valid gen-replaceable block before generating your ores.

 

You need to check if the block going to be replaced is world-gen replaceable / stone

 

int x = chunkX*16 +random.nextInt(16);

int y = chunkY*16 +random.nextInt(16);

int z = chunkZ*16 +random.nextInt(16);

int id = world.getBlockID(x,y,z);

Block block = Block.blocksList[id];

if(block!=null && block.isGenMineableReplaceable(world, x, y, z, Block.stone.blockID))

  {

//set your blocks here....

  }

Quite simply, you are not checking to see if it is a valid gen-replaceable block before generating your ores.

 

You need to check if the block going to be replaced is world-gen replaceable / stone

 

int x = chunkX*16 +random.nextInt(16);

int y = chunkY*16 +random.nextInt(16);

int z = chunkZ*16 +random.nextInt(16);

int id = world.getBlockID(x,y,z);

Block block = Block.blocksList[id];

if(block!=null && block.isGenMineableReplaceable(world, x, y, z, Block.stone.blockID))

  {

//set your blocks here....

  }

 

Thanks, it works great!