TomeNET

(5.17b) Digging - common example values                                         
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Some example values, assuming 0.000 'Digging' skill
and unenchanted (ie (+0,+0)) digging tools with (+1) to digging:
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Without a digging tool..
-You always have a chance to remove rubble and organic material, even without
 a digging tool. Might take quite a while if your strength is low though.
-You cannot tunnel through granite wall without a digging tool if your STRength
 is below 18/180.
-You cannot tunnel through quartz without a digging tool if your STRength is
 below 18/100.
-You cannot tunnel through magma without a digging tool if your STRength is
 below 18/60.

With a digging tool..
-You can tunnel through all materials other than granite walls with just a
 basic shovel even if your STRength is only 3.
 (For quartz, you have a 3% chance to succeed at 18/50 STR with the shovel
  and at 18/10 STR with a pick. If you use an enchanted shovel (+9,+9) (+1)
  however, you already have a 3% chance to succeed at only 5 STR.)
-You cannot tunnel through granite with a basic shovel if your STRength is
 below 18/30.
-You cannot tunnel through granite with a basic pick if your STRength is
 below 12.

You can tunnel through all tunneable materials, no matter your strength, with..
-a (+1) shovel that has +hit and +dam enchanted to a total of at least +15.
-a (+1) pick that has +hit and +dam enchanted to a total of at least +6.
-any (+2) digging tool or better (except if it was cursed and therefore has too
 negative (+hit,+dam) enchantments).