Copper rose by more than $100 per tonne, while nickel rose by $185 at the close – it has been supported this week by news that Vale Canada will suspend operations at its Birchtree nickel mine on October 1. All other base metals also increased, with tin hitting $20,400 per tonne for the first time since March 2016. This follows a weak day for base metals prices yesterday: at the day’s lows, lead and nickel were down 4.1% and 3.3%. Despite the end-of-week increases, there is still an air of caution in the market surrounding President Donald Trump, leading to pessimism over tax or infrastructure overhauls. "After a volatile week, markets recovered...