Recently I upgraded my leadership skill and I've noticed in that time a sudden increase in the proportion of mining collapses which are costly in the long run. I've had no less than 10 collapses in the last month alone compared to maybe once a month (for a whole year) prior to my leadership upgrade.
So question is, what the hell is triggering these several sudden collapses and what is the formula used to determine such? I've gone through the mining rules page and it doesn't list any specific formula or chances of collapses.
The only factor that I have heard is the number of NPCs used in the extraction - the more NPCs, the higher the chance of collapse.
Using 0 NPCs will not protect you, though. I have heard of very costly collapses with 0 NPCs involved.
Let me add that I wonder why such a costly aspect of a primary sector of the economy is not covered by the rules.
I've heard size of extraction aka # of NPCs as well.Also noticed a drop in the frequency of collapse when mines are completely empty at the extraction time.
Just heresay though..sure would be nice to know if there is actually anything that can be done to counter this...after the new mining rules came in,collapse` were particularly painful
NPC numbers assigned have remained constant, which is what fustrates me as I sort of expected that a leadership leveled up would at least negate the risk.
Perhaps I've just had a purely rotten luck of hitting the random collapse variable but it would still be nice to know what it is based on.