Common use of Prudent Operations Clause in Contracts

Prudent Operations. The ores (even after undergoing some type of treatment) extracted and recovered from the Properties, may be commingled with ores (even after undergoing some type of treatment) with a similar composition extracted from other mining Properties other than the Properties. All determinations required for the calculation of the Net Smelter Returns, including, without limitation, the metal grade of ores extracted from the Properties, and the metal grade or amount of metal recovered from such ores, shall be made by CHAMBARA in accordance with prudent engineering, metallurgy and cost accounting practices. <PAGE>

Prudent Operations. The ores (even after undergoing some type of treatment) extracted and recovered from the Properties, may be commingled with ores (even after undergoing some type of treatment) with a similar composition extracted from other mining Properties other than the Properties. All determinations required for the calculation of the Net Smelter Returns, including, without limitation, the metal grade of ores extracted from the Properties, and the metal grade or amount of metal recovered from such ores, shall be made by CHAMBARA BONGARA in accordance with prudent engineering, metallurgy and cost accounting practices. <PAGE>