EXHIBIT 11 THE GENERAL CHEMICAL GROUP INC. COMPUTATION OF PER SHARE EARNINGS (IN THOUSANDS, EXCEPT PER SHARE AMOUNT) (UNAUDITED) Earnings per share were calculated as follows: THREE MONTHS ENDED MARCH 31, ------------------------ 1997 1998 ---- ---- Basic Total income used for basic earnings per share................................................ $ 11,714 $ 9,861 ========= ========== Weighted average common shares outstanding....................................................... 22,311 21,049 Basic earnings per common share................................... $ .53 $ .47 ========= ========== Diluted Total income used for diluted earnings per share................................................ $ 11,714 $ 9,861 ========= ========== Weighted average common shares outstanding....................................................... 22,311 21,049 Weighted average common equivalent shares................................................. 992 977 --------- ---------- Weighted average common and common equivalent shares.......................................... 23,303 22,026 ========= ========== Diluted earnings per common share and common equivalent share....................................... $ .50 $ .45 ========= ========== - ----------------- All prior period per share figures have been restated in accordance with FAS 128. -13-