With that ejecting drill bug fixed, it is so much easier to design a cobble generator with miners.
I just designed one that is random tick proof:There are 2 miners that are next to a recycler. A batbox is enough to power 2 of these combinations. The glass in the picture is optional - I just put it there to prevent fire generated by lava. I put a debug item into the bottom slot of the batbox to make it an infinite EU source.
Since this is most likely be used for scrap production, I only used normal drills and OD scanners to reduce EU cost per scrap. 1 lava source will be enough for 4 miners, but I put 2 there so that there is at least 1 cobble between the miner and the ore. I'm not certain if this is necessary.
Kris, how are you keeping the miners from harvesting the block between them underneath the recycler? (assuming you're not editing IC2.ini.)