Miners break each other during the mining process.

[sherkas]

I understand they will break themselves at the end to pack up,

however if I make a 25x25 area with 5 miners, within a few minutes most will break each other while depositing resources. So then your left with 1-2 miners for a massive area.

Suggestion: Let them raise to surface but wait until the last one is empty before they return to empty. So like a queue system to empty resources.