Also from the "negative news department," Trump's rollbacks on environmental protections have potentially put Alaska's massive Pebble copper, gold and molybdenum mine back in play. If it does go ahead, it will put downward pressure on the price of those metals in the years ahead. 

https://www.adn.com/politics/2017/05/12/pebble-is-on-epa-reaches-deal-with-bristol-bay-gold-mine-company/