Gold, silver up on safe-haven buying as U.S. equities sell off Gold and silver prices are are higher in midday U.S. trading Thursday, on more safe-haven demand amid risk aversion that is still keen in the marketplace. Global stock markets and the U.S. stock indexes are still on shaky ground amid the biggest geopolitical crisis in decades that appears to be worsening. Some hot U.S. inflation data today was also bullish for the metals markets. April gold futures were last…