Elliott, Dan "Mine company says EPA is worsening Colorado water pollution", APNews, Associated Press, April 11, 2018. Retrieved October 24, 2018.
bna.com
BloombergArchived October 24, 2018, at the Wayback Machine "Five Things to Know About the Gold King Mine Spill in Colorado", The Bureau of National Affairs, Inc., Bloomberg, September 7, 2016. Retrieved October 23, 2018.
Lang, S. "SGC Mining and Reclamation Activities and Metals Loading in the Animas River", by Steven Lange, M.S., Senior Project Manager, Knight Piésold Consulting, Knight Piésold Ltd., January 2018, pages 3, 5 and 19. Retrieved October 24, 2018.
BloombergArchived October 24, 2018, at the Wayback Machine "Five Things to Know About the Gold King Mine Spill in Colorado", The Bureau of National Affairs, Inc., Bloomberg, September 7, 2016. Retrieved October 23, 2018.