Items from successful mining have random QL, but the maximum possible is the lower of your mining skill and the tile's inherent quality. See [[prospecting]] for details about tile quality.
'''Note''': In order to gain skill from a mining action the by product has to be anywhere in between 1.01 and 39.99 quality range .'''Note''': All tests were done with a 10ql pickaxe.
{| class="wikitable"
! Tile type !! Skill
|-
| [[Rock]], [[Zinc vein|Zinc]] || 1-5035
|-
| [[Iron vein|Iron]] || 5035-6055
|-
| [[Copper vein|Copper]] , [[Slate vein|Slate]], [[Lead vein| 60Lead]] || 55-7085
|-
| [[Tin Silver vein|Tin]], [[Zinc vein|Zinc]] or [[Lead vein|LeadSilver]] || 70-85+
|-
| [[Silver vein|Silver]] or [[Marble wall|Marble]] || 90+
|+ Optimal Skill Gain
|}