==Digging for Rock Guide==
To set up a mine where there is no exposed rock, you must first reveal the rock layer under the dirt layer. Dig at a reasonable distance above [[water]]. Keep digging in one corner until "You hit rock" or do not have enough skill to continue digging. Once you hit rock in one corner, then you must dig in all other corners until they have hit rock also. When you hit rock in all four corners, then the rock tile will be uncovered. If you lack the skill to dig in "such steep slopes", you could dig the nearby tiles down further as well, to reduce the slope to the corners you are working on.
==Small Digging Guide==
For those that have trouble with any of the above guides, here is a small picture that may clarify it. This is the result of dropping a small amount of dirt on the corner of a tile:
http://img237.imageshack.us/img237/9803/n00bdiggingguideoe0.png
As per the image above, if you were to stand on the center corner (right in the center of the green square) and examine the rectangular tile border north of you, the game would tell you that the "slope is 1 dirts steep away from you". If you were to stand in the top-middle, and looking south, the examine would say that "the slope is 1 dirts steep towards you".
==Tutorials==