public class WorldGenCustomOres implements IWorldGenerator {
    @Override
    public void generate(Random random, int chunkX, int chunkZ, World world, IChunkGenerator chunkGenerator, IChunkProvider chunkProvider) {
        if(world.provider.getDimension()== 0) {
          generateOre(ModBlocks.ORE_OVERWORLD_MEGONIUM.getDefaultState(), world, random, chunkX * 16, chunkZ * 16, 0, 30, random.nextInt(4) + 1, 5);
        } else if(world.provider.getDimension()== -1) {
           generateOre(ModBlocks.ORE_NETHER_MEGONIUM.getDefaultState(), world, random, chunkX * 16, chunkZ * 16, 0, 200, random.nextInt(4) + 1, 5, BlockMatcher.forBlock(Blocks.NETHERRACK));
        } else if(world.provider.getDimension()== 1) {
        	generateOre(ModBlocks.ORE_END_MEGONIUM.getDefaultState(), world, random, chunkX * 16, chunkZ * 16, 0, 200, random.nextInt(4) + 1, 5, BlockMatcher.forBlock(Blocks.END_STONE));
        }
    }

    private void generateOre(IBlockState ore, World world, Random random,int x, int z, int minY, int maxY, int size, int chances, Predicate<IBlockState> BlockToReplace){
        int deltaY = maxY - minY;
        for(int i = 0; i < chances; i++) {
            BlockPos pos = new BlockPos(x + random.nextInt(16), minY + random.nextInt(deltaY), z + random.nextInt(16));

            WorldGenMinable generator = new WorldGenMinable(ore, size, BlockToReplace);
                    generator.generate(world, random, pos);

        }
    }
}