EXHIBIT 11 THE GENERAL CHEMICAL GROUP INC. COMPUTATION OF EARNINGS PER COMMON SHARE (IN THOUSANDS, EXCEPT PER SHARE AMOUNT) (UNAUDITED) Earnings per share were calculated as follows: THREE MONTHS ENDED MARCH 31, ------------------------ 1996 1997 ---- ---- Primary Total income used for primary earnings per share................................................ $ 9,316 $ 11,714 ========= ========== Weighted average common shares outstanding....................................................... 19,737 22,262 Weighted average common equivalent shares................................................. -- 1,032 --------- ---------- Weighted average common and common equivalent shares.......................................... 19,737 23,294 ========= ========== Primary earnings per common share and common equivalent share ...................................... $ .47 $ .50 ========= ========== Fully Diluted Total income used for fully diluted earnings per share................................................ $ 9,316 $ 11,714 ========= ========== Weighted average common shares outstanding....................................................... 19,737 22,262 Weighted average common equivalent shares................................................. -- 1,121 --------- ---------- Weighted average common and common equivalent shares.......................................... 19,737 23,383 ========= ========== Fully diluted earnings per common share and common equivalent share....................................... $ .47 $ .50 ========= ========== -13-