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~ III IIIIIIIIIIIII III ~ <br />November 5, 1991 <br />To: G.C. Dodson <br />From: J.C. Lenz <br />Subject: October Monthly Operating Report <br />Mill Operations <br />1.1 Crushing <br />Approximately 133,210 wet tons of ore were crushed <br />in October. Operating availability of the primary <br />crusher was 90.3$. No major operating problems were <br />experienced this month. The most common reasons for <br />downtime during the month were misalignment of CV- <br />O1 and slab rock blockages of the feeder and the <br />crusher. <br />1.2 Grinding <br />138,973 dry tons of ore were ground during October. <br />Operating availability of the plant increased to 92.8$ <br />this month. Average plant throughput for the month <br />increased to 201 tons per hour. Pump and Slurry flow <br />problems abated at mid month due to an ore change. During <br />a scheduled maintenance shutdown, a ball trap was <br />installed on the SAG mill discharge launder, completion <br />of the conversion of the SAG mill to 5/8" slotted grate <br />discharge, and removal of the mill trommel screens were <br />completed. These changes allowed CV-03 to be shut down. <br />The only significant loss of production other than <br />scheduled maintenance was due to near simultaneous <br />failure of the cyclone feed pump liners. Power <br />consumption decreased to 24.2 kwh/ton. <br />