Tunneling

==In-Game Text==
"Caroubdin, High King
Demanded of his mountain realm,
In the third month of the Conflux,
Red Gold, and Blue steel."
You have begun getting to know the mountains, its ways and means, and its cruel, fickle whims. You may construct stone columns to support your mining operations, and you find better ores when mining.
== What it does ==
Tunneling allows you to get more metal from smelting Ore, and allows you to construct Stone Columns. Stone columns have a larger radius than Mine Supports, so it is advised to take this skill to save some metal on building supports.
It is one of the skills that every dedicated miner ought to have, the others being Metallurgy, Steelmaking and Deep Artifice.
==Notes==
* Added in update "Spit'n'Polish"