Yesterday, 8:59 PM · 54 replies and 2937 views.
I haven't tried without prospectors yet. it is something i have been meaning to do, but without a baseline of the low/med/high distribution and the expected numbers from each type, it would be difficult to get meaningful results without prospectors. I have enough for a baseline now, so I might give this a go sometime soon.
I don't think the ore content of a roid has any effect on the materials, though I have no proof for this theory. I am pretty certain that the reserves don't matter at all. I haven't noticed any difference between the materials in a pristine ring compared to a depleted one.
Yinyin might be able to offer some insight as to whether prospectors make any difference to the material yield from a roid or not, since he regularly mines persistent roids. - edit - Ha, didn't see that he had already replied.