Haha, I went mining this afternoon as I saw a Void Opal hotspot during my explorations and thought, ok, give this core mining thing a try. I spent nearly three hours, and got 4.83 tons of them (the 0.83 being what's still in the refinery). Reason? Despite dropping less than 100km from the waypoint for the hotspot, and passing through it during my time mining, I got just one rock with Void Opals in.How can anyone be that bad at something?
One.
Nevertheless, I did enjoy blowing up my first asteroid, even if it took a few attempts.
Edit: I did get 22 tons of Tritium, though.