Is it amount until depleted, or is the line drawn at some other point of a source's degradation?

I mean, I know once an oil well is depleted, it'll still produce, albeit only at 0.1 units per second. Is that the point where YARM considers it to be empty? Or is it when production reaches 0.2/second or some other point?

On an endless resource, the % is the sum of yields as if YARM v0.8 (calculated approximately the same way as vanilla, so should match what you see hovering on the map).

The estimate-to-depletion is actually wrong (as of v0.8.5) because it's timing how long until the site gets to absolute 0 -- which is not possible with endless resources -- and because the extraction rate decays over time.