Gold prices edged lower on Friday and were on track for a weekly loss amid inflation concerns and potential US Federal Reserve interest rate hikes. Fundamentals Spot gold was down 0.3% at $4,200.82 per ounce, as of 0101 GMT, and was set for a weekly loss of 2.8%. US gold futures for August delivery rose 2.6% to $4,222.10. Gold fell to an over six-month low on Thursday before closing hi