Donald Trump’s trade offensives against China, Europe and Mexico may be driving the global markets into a frenzy, but the uncertainty is just the fix South Africa’s gold-miner stocks needed. The precious metal posted the biggest seven-day rally since the 2008 financial crisis after investors’ expectations for a quick deal between the US and China evaporated. That has vindicated analysts, who have raised earnings forecasts for South African gold miners by 35% this year, seven times as fast as estimates for the broader market.