NEW YORK (AP) â¿¿ Shares of some top silver companies were mixed at the close of trading: Hecla Mining Co. fell $.08 or 1.4 percent, to $5.59. Pan American Silver Corp. fell $.58 or 3.1 percent, to $18.07. Silver Standard Resources Inc. rose $.13 or 1.0 percent, to $13.44. Silver Wheaton fell $1.07 or 3.0 percent, to $35.11.
