NEW YORK (AP) â¿¿ Shares of some top silver companies are down at 10 a.m.: Hecla Mining Co. fell $.04 or 1.2 percent, to $3.18. Pan American Silver Corp. fell $.02 or .2 percent, to $10.87. Silver Standard Resources Inc. fell $.16 or 2.5 percent, to $6.21. Silver Wheaton fell $.30 or 1.2 percent, to $23.98.
