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 NINE MONTHS ENDED SEPTEMBER 30, SEPTEMBER 30, -------------------- -------------------- 1997 1998 1997 1998 -------- -------- -------- -------- Basic Income before extraordinary item used for basic earnings per share ................. $ 15,102 $ 11,766 $ 44,074 $ 36,313 Extraordinary item .......................... -- -- -- (3,661) -------- -------- -------- -------- Total income used for basic earnings per share ....................... $ 15,102 $ 11,766 $ 44,074 $ 32,652 ======== ======== ======== ======== Weighted average common shares outstanding .............................. 21,038 21,100 21,555 21,085 Basic earnings per common share. ............ $ .72 $ .56 $ 2.04 $ 1.55 ======== ======== ======== ======== Diluted Income before extraordinary item used for basic earnings per share ................. $ 15,102 $ 11,766 $ 44,074 $ 36,313 Extraordinary item .......................... -- -- -- (3,661) -------- -------- -------- -------- Total income used for diluted earnings per share ....................... $ 15,102 $ 11,766 $ 44,074 $ 32,652 ======== ======== ======== ======== Weighted average common shares outstanding .............................. 21,038 21,100 21,555 21,085 Weighted average common equivalents shares ....................... 1,147 777 1,055 894 -------- -------- -------- -------- Weighted average common and common equivalent shares ................. 22,185 21,877 22,610 21,979 ======== ======== ======== ======== Diluted earnings per common share and common equivalent shares ............. $ .68 $ .54 $ 1.95 $ 1.49 ======== ======== ======== ======== - ---------------- All prior period per share figures have been restated in accordance with FAS 128. - 15 -