EXHIBIT 11.1 COMMONWEALTH ALUMINUM CORP. CALCULATION OF EARNINGS PER COMMON SHARE (In Millions, Except Per Share Amounts) Three Months Six Months Ended June 30, Ended June 30, -------------- -------------- 1996 1995 1996 1995 ---- ---- ---- ---- Earnings applicable to common shares $2.1 $12.9 $4.5 $21.6 Common shares outstanding 10.2 10.2 10.2 10.2 Earnings per common share $.21 $1.27 $.44 $2.12