U.S.-based American Rock Salt Co. LLC's credit metrics are showing signs of recovery as the effect of last year's unusually warm winter rolls through the company's financial results. We are affirming our 'B-' corporate credit rating on American Rock Salt and revising our outlook to stable from negative. The stable rating outlook reflects our view that the company's operating performance will continue to improve during the next 12 months and will support improved EBITDA and adequate liquidity, assuming normal weather patterns next winter. NEW YORK (Standard&Poor's) April 30, 2013--Standard&Poor's Ratings Services said today it revised its rating outlook on Mount Morris, N.Y.-based American Rock Salt Co. LLC (ARS) to stable from negative. At the same time,