EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2012

Reconciliation between basic and diluted earnings per share

The following table provides further share information used in computing our earnings per share for the periods presented herein. Basic earnings per share was computed by dividing net income attributable to AMCOL shareholders by the weighted average number of common shares outstanding during each period. Diluted earnings per share was computed by dividing net income attributable to AMCOL shareholders by the weighted average common shares outstanding after consideration of the dilutive effect of stock compensation awards outstanding during each period.

	Nine Months Ended September 30,				Three Months Ended September 30,
	2012		2011		2012		2011
Weighted average number of common shares outstanding		32,024,603		31,671,781		32,071,202		31,799,536
Dilutive impact of stock based compensation		315,636		455,777		381,676		393,922
Weighted average number of common and common equivalent
shares outstanding for the period		32,340,239		32,127,558		32,452,878		32,193,458
Number of common shares outstanding at the end of the period		31,959,139		31,666,904		31,959,139		31,666,904

Weighted average number of anti-dilutive shares excluded from the computation of diluted earnings per share		635,738		186,929		276,753		218,800