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 SIX MONTHS ENDED JUNE 30, JUNE 30, ----------------- ----------------- 1997 1998 1997 1998 ---- ---- ---- ---- Basic Income before extraordinary item used for basic earnings per share............................ $ 17,258 $ 14,686 $ 28,972 $ 24,547 Extraordinary item................................... -- (3,661) -- (3,661) ---------- --------- --------- --------- Total income used for basic earnings per share.................................. $ 17,258 $ 11,025 $ 28,972 $ 20,886 ========== ========= ========= ========= Weighted average common shares outstanding......................................... 21,327 21,103 21,817 21,076 Basic earnings per common share...................... $ .81 $ .52 $ 1.33 $ .99 ========== ========= ========= ========= Diluted Income before extraordinary item used for basic earnings per share............................ $ 17,258 $ 14,686 $ 28,972 $ 24,547 Extraordinary item................................... -- (3,661) -- (3,661) ---------- --------- --------- --------- Total income used for diluted earnings per share.................................. $ 17,258 $ 11,025 $ 28,972 $ 20,886 ========== ========= ========= ========= Weighted average common shares outstanding......................................... 21,327 21,103 21,817 21,076 Weighted average common equivalents shares.................................. 1,026 898 1,009 873 ---------- --------- --------- --------- Weighted average common and common equivalent shares............................ 22,353 22,001 22,826 21,949 ========== ========= ========= ========= Diluted earnings per common share and common equivalent shares ....................... $ .77 $ .50 $ 1.27 $ .95 ========== ========= ========= ========= - -------------------- All prior period per share figures have been restated in accordance with FAS 128. -14-