Most likely an earlier version.
I'm only 5% into my newest test with the ender quarries. Same setup 8 quarries 64x64 for a total of 128 chunks. I changed Emerald, Iridium, Titanium and Uranium from BlocksPerGroup of 2 to 3. So far I already have 3 Uranium, 3 Emerald and 82,000 netherack. By now...