We have finally added our ash farm to the Iconic Resource Besevrona hub. Now we have everything to make bricks. Ash, again, drops the same amount of resources on level 5 and level 6 planets. Source
The advantage of a farm on a level 5 planet is that you only need 4000 damage to one hit the mud, which my miner easily does with a normal forged AE shovel. No longer do you need a strength brew but can instead use a speed brew without the shovel epic.
The farm has a 3x3 plot area which contains 1728 ash blocks (100%).
The farm has a door. In the unlikely case that the regeneration bomb kicks you out you can easily get back in.