NEW YORK (AP) â¿¿ Shares of some top silver companies were mixed at the close of trading:

Hecla Mining Co. unchanged at $4.90.

Pan American Silver Corp. fell $.05 or .3 percent, to $16.33.

Silver Standard Resources Inc. fell $.32 or 2.5 percent, to $12.55.

Silver Wheaton rose $.26 or .8 percent, to $31.91.

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