Thanks to
this thread, and using the Brick Furnace, I've managed to mass-produce brick blocks essentially for free (only slightly freer than digging out stone) to be used in either surface constructions or underground furniture, the color of which is easily controlled. The process is detailed adequately in that linked post.
Anyway, I steamed for a little while on how to collect clay boulders (because I had never messed with clay before earlier today), until I found I was forced to build the Clay Oven in order to run the "collect sand/clay/peat" reaction on repeat. Cool. I continued to have an excess of fire clay until my Oven Operator hit legendary. Currently, I have four Clay Ovens running the "collect clay/sand/peat" reaction in order to generate more collection jobs.
Recently, I've build a Screw Press one z-level above in a peat layer to start collecting and compressing peat to use as fuel for the smelters. I figured the four Clay Ovens would also take care of telling workers to collect peat, but that doesn't seem to be the case. At any given time, three to four workers are all working the tile next to the Brick Furnace. Occasionally one worker will approach the designated peat tile and dig. I need to find a way to group workers on top of the peat tile in the same consistent manner they camp on the fire clay. Would building a Clay Oven on the same z-level as the Screw Press and setting the "collect sand/clay/peat" reaction have a worker collect the peat?
Basically, my question is: Does the "collect sand/clay/peat" reaction in the Clay Oven prefer to send a worker to the closest collection zone? does it prefer to have workers gather higher-value materials? or does it just send workers to random collection zones, all willy-nilly?
Also: it seems rather clunky to have to build redundant Clay Ovens just to produce more collection jobs. Is there any way to have workers automatically collect from zones? Or is there some other way to manage collection without the use of a physical workshop? Don't get me wrong, Clay Ovens are pretty damn cheap and I'm on no shortage of space, but it just seems odd to me to build a whole workshop to govern collection only to have it tucked away in a back room, gathering cobwebs.