GDXU is trading at $76.80, down 9.36%, as gold slid amid concerns over the Fed’s rate outlook. - Investors weighed the Fed’s rate hold, hawkish dissent and unclear policy outlook; higher rates and a firmer dollar can pressure non-yielding bullion. - September PCE inflation was 3.6% year over year, reinforcing concerns about persistent inflation and possible further tightening. - As a 3x leveraged gold-miners ETN, GDXU can amplify weakness in its underlying miners when gold prices fall.