[1.6.4] Mining Worlds 0.8.4 - Basic mining dimensions

I've created a small mod which adds a single block, "Mining Portal". Using the portal, the player is teleported to a new dimension suitable for automated mining. In that dimension, a portal block for returning to the overworld is automatically created.

Please note that placing a portal block to create a mining world anywhere except in the overworld is not recommended. Using Mystcraft linking books is currently not recommended either.

Also note that this mod have zero security measures in...

[1.6.4] Mining Worlds 0.8.4 - Basic mining dimensions