The S&P/TSX Composite Index gained nearly 0.5% to trade above 35,000 on Tuesday amid optimism over a pending US-Iran peace deal. US President Donald Trump said at the G7 summit that negotiations with Iran had entered a second stage. Oil prices slid as markets weighed the prospect of renewed supplies, easing concerns about energy-driven inflation and reducing fears of a hawkish shift by central banks. Lower bond yields supported financial stocks and the broader market, with RBC up more than 0.6%, TD Bank adding 0.5%, and BMO advancing nearly 1%. Higher gold prices boosted mining shares, with Agnico Eagle and WPM rising more than 1.5% and Barrick gaining over 1%. In contrast, lower oil prices weighed on energy stocks, with Canadian Natural shedding 1.5% and Suncor losing nearly 2%. Meanwhile, home sales rose 5.5% in May while home prices edged lower. Investors are awaiting the US Fed's policy decision on Wednesday, with markets widely expecting interest rates to remain unchanged.