Gold mining stocks are experiencing pre-market declines. At the time of writing, Sibanye (SBSW.US) is down 5.05% at $12.495, while Anglogold Ashanti (AU.US) has fallen 3.97% to $98.016. The movement follows a three-day consecutive drop in spot gold prices as of May 14th, influenced by a strengthening U.S. dollar and Treasury yields. Analysis indicates that U.S. Producer Price Index (PPI) for April rose 6% year-over-year, reaching its highest level since December 2022, with core PPI increasing 5.2% year-over-year, both figures significantly exceeding market expectations. Rising energy and transportation costs, alongside services inflation hitting a four-year high, have contributed to the unexpected surge in PPI. This has heightened expectations for Federal Reserve interest rate hikes, with market projections now estimating a roughly 50% probability of a 25-basis-point increase within the year.