shares of arch resources inc arch charged up 109 toward a threemonth high in afternoon trading thursday after the producer and distributor of thermal coal reported a fourthquarter profit that was more than double what was expected boosted by “significantly improved” sales volumes unit costs and cash margins as well as a 2533 million tax benefit net income rose to 4705 million or 2318 a share from 2266 million or 1192 a share in the yearago period that beat the average analyst estimate of 1050 according to factset revenue grew 67 to 8595 million well above the factset consensus of 8595 million as metallurgical revenue increased 134 to 5167 million and thermal revenue fell 21 to 3427 million metallurgical tons sold rose to 23 from 20 while thermal tons sold fell to 161 from 188 the stock has gained 77 over the past three months and run up 386 over the past 12 months while the sp 500 spx has tacked on 44 the past three months and declined 77 the past year