Today the pile was closer to the road and was massively overgrown with weeds at the top, but they hadn't started dropping seeds yet. But the pile was pretty hard, not like the gorgeous stuff of the spring. I imagine this pile has been sitting here for quite a while since it's not the busy season.
14 un-compressed buckets of very dry soil (it hasn't rained in ~2 weeks) landed just shy of the minimum. It was 230 kg or 507 pounds.
Saved 1 bucket to put in the basement (adding to a few buckets there from the spring haul). The other 13 buckets were enough to put a nice layer in the eastmost "square" plus one or two buckets stored under the vertical structure to disperse in the spring.
Ideally would like to get another load for the yard next spring but won't bother going back this fall given how dense/old the pile is, especially as those weeds will start dropping their seeds all over it at some point.