Silver has skyrocketed 70% this year, leaving gold's 50% rally in the dust. But silver's surge looks shaky, as it's powered by Fed rate cuts and fast-money inflows, Goldman Sachs wrote. A smaller market and no central-bank safety net make silver far more volatile than gold. Silver has stolen the spotlight in this year's precious-metals rally, soaring more than 70% and leaving gold's 50% gain behind. On Monday, silver extended its run in early global trading, touching a record of $51.38 per ounce, ...