The S&P500 hit another, new all-time high and closed 0.01% higher at 3,168.8 points.
US president Donald Trump tweeted on Friday: "This is an amazing deal for all.
"We will begin negotiations on the phase two deal immediately, rather than waiting until after the 2020 election."
Most market futures were pointing to a positive start this week.
The gold price meanwhile remains around US$1,475 an ounce on the spot market.
In London, Polymetal International (LSE: POLY) closed down 3.2% on Friday and Fresnillo (LSE: FRES) lost 3%.
Newmont Goldcorp (NYSE: NEM) rose 0.4% in New York while in Toronto, Teck Resources (TSX: TECK.B) gained 0.86%.
BHP (ASX: BHP) was up about 1.2% in morning Australian trade.
