Arch Coal (NYSE: ACI) opened at $35.24. So far today, the stock has hit a low of $34.75 and a high of $37.67. ACI is now trading at $36.84, up $1.96 (5.62%). Over the last 52 weeks the stock has ranged from a low of $30.72 to a high of $77.40. Shares of ACI are trading higher today, helped by higher coal futures. Technica...(Click the story link or go to http://www.marketintelligencecenter.com for the full story)