SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2012

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Revenue by segment

The composition of our revenues by segment is as follows:

	Three Months Ended
	March 31,
	2012	2011
Minerals and materials	53%		53%
Environmental	22%		24%
Oilfield services	23%		21%
Transportation	5%		6%
Intersegment sales	-3%		-4%
	100%		100%