Collapse
A collapse can occur when you dig a tunnel, or with a small probability a cave can collapse.
Empty ore
In caves you can find stones with traces of ore, but without the ore itself.
Ghost miner
Wanders through caves and mines resources. Not aggressive towards the player, disappears and drop ore if hit.
Commands
/bwd reload - apply config settings
/bwd collapse boolean - enable/disable collapses
/bwd collapse probability number - set the probability of collapse
/bwd collapse quantity number - specify the minimum required amount of stone above the broken stone for a possible collapse
/bwd collapse size minimal number - set minimum collapse size along the x and z axes
/bwd collapse size maximal number - set maximum collapse size along the x and z axes
number - 1, 2, 3...
boolean - true/false