Signs of de-escalated US-China trade tensions reduced the safe-haven appeal of gold, while the market awaited the Federal Reserve's interest rate decision this week. On Monday, gold price busted below US$4,000 per ounce.Spot gold last fell by US$130.8 or 3.2% to US$3,982.2 per ounce. Gold futures for December delivery sank by US$140.8 or 3.4% to US$3,997 per ounce.Related NewsCore Inflation Rate YoY for Sep in United States is 3.0%, lower than the previous value of 3.1%. The forecast was 3.1%.Silver futures for December delivery dropped by 3.6% to US$46.8 per ounce. Copper futures for December delivery rose by 0.7% to US$5.16 per pound.