and if you wanted to be really broken/sadistic you could say up two levels would be ONE HUNDRED STRIKES!... per chance - and the chance would be a pitiful 12.5-25% (lean towards low since it'd be more sadistic and more balanced)
You'd probably pass out before getting an ore from Iron with copper - since the chance would so low. - and that's /if/ Durability isn't introduced, and if a copper pick wouldn't break before you got an ore too - Which would be enhanced by quality, upgrades to the forge, etc (Someone has previously suggested the oil bucket going back to being a water bucket, and oil bucket being an upgrade you'd purchase, as well as faster smelter and forge and etc. - They also mentioned Water cooling is weaker and oil cooling helps improve durability or something like that. - and Dasius did respond to that specific post acknowledging that specific point (and not having previously known about it)
and (if) any other mining above tiers were allowed
1000 at 6.25%-12.5%
10000 (absolutely copper wouldn't last this long, and neither would most without durability buffs out the wazoo) (with abysmal chance of impossible)