"The following acknowledgement should have appeared in the original text, and was omitted due to a regrettable oversight."
We gratefully acknowledge the assistance of Duane Froese (University of Alberta) and Grant Zazula (Yukon Government) for field assistance and interpretation of stratigraphy at the Gold Run site. We also thank the Christie family (Christie mine), the Johnson family (Irish Gulch), the Klein family (Gold Run), and Alf Roberts (Homestake Gulch) for permission to analyse material exposed during mining operations.