I create a Multiblock following the tutorial: http://www.minecraftforge.net/wiki/Metadata_Based_Subblocks

 

But I'm having problems to add the Worldgen for this blocks, I can't find a way to generate only the subBlocks for metadata 5 and 6.

 

Here is my worldgen class: http://pastebin.com/zZj5cmfk

 

I added the following line just to avoid errors:

 

                Block subBlock = BlacksmithMod.ores;

 

Regards,

Okay, you are obviously the "copy & paste modder." You need a metadata sensitive WorldGenMinable, which is there. Look in that class and use the correct constructor.