Do you have the power station rule added? Don't know if this works with MIN's ! With this rule if the power station run out of coal then the other IND's won't work tell the power station get enoght coal to operation again.
I think the MINs set up a little difference in TS12 then older virsions,you set up quene then product,then back to quene set the amont of product.Don't rememerbering doing this in earlier virsions.