- last post: 01.01.0001 12:00 AM PDT
I do believe that in First Strike, it mentioned something about the Covenant doing some mining by using the heated plasms off their ships' weapons. Might be mistaken though. That was on Reach I think. And if I had to guess, after all the Spartans ditched Reach, thats when the Covenant got hold of the coordinates for The Ark a.k.a. Earth.