RT Journal Article SR Electronic T1 Early Ore Formation JF Science JO Science FD American Association for the Advancement of Science SP 1040 OP 1040 DO 10.1126/science.326.5956.1040-e VO 326 IS 5956 A2 Hurtley, Stella YR 2009 UL http://science.sciencemag.org/content/326/5956/1040.5.abstract AB