Gold futures rallied above $1 500 an ounce on sustained demand for the traditional haven as the US-China trade war festers, global growth slows and central banks around the world ease monetary policy. The precious metal rose as much as 1.2% to $1 502.30 an ounce on the Comex, the highest level since 2013. The move extends this year’s rise to 17%, with gains underpinned by inflows into exchange-traded funds. Silver also surged.