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CONCENTRATION OF RISK: (Tables)

12 Months Ended

Dec. 31, 2011

CONCENTRATION OF RISK:

Schedule of concentration risk for cash equivalents invested

Country		% of total cash (1)		% invested in one institution
United States		86.9	%	25.2	%
Peru		9.1	%	84.3	%
Mexico		4.0	%	96.1	%

(1) 97.7% of the Company’s cash is in US dollars.

Schedule of company's largest customers as percentage of accounts receivable and total sales

		2011		2010		2009
Accounts receivable trade as of December 31,
Five largest customers		35.9	%	49.1	%	37.4	%
Largest customer		10.8	%	16.3	%	11.2	%
Total sales in year
Five largest customers		28.7	%	29.6	%	35.1	%
Largest customer		7.3	%	9.9	%	8.5	%

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Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

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