Market Movers -Arena Pharmaceuticals, Inc.(NASDAQ:ARNA), Hecla Mining Company(NYSE:HL), Dynavax Technologies Corporation(NASDAQ:DVAX), Arch Coal Inc(NYSE:ACI) By: SBWire - Latest Press Releases January 22, 2014 at 09:21 AM EST Las Vegas, NV -- (SBWIRE) -- 01/22/2014 -- Read More >> Related Stocks: Hecla Mining Company