More on Alpha Natural Resources' (ANR) Q4 results: Q4 loss narrowed from the year-ago period; included a $188M asset writedown based on conditions in the coal market and lower expected future production. Coal revenue fell 24% Y/Y, as the volume of coal sold fell 17% to 25.9M tons. Expects 2013 coal shipments of 81M-92M tons, vs. 108.8M in 2012. Shares +5.6% premarket.