By De Souza, E.
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Additional resources for Mine Ventilation: Proceedings of the North American/Ninth US Mine Ventilation Symposium, Kingston, Canada, 8-12 June 2002
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The Ertsberg-Grasberg complex is located in the Sudirman Mountains at elevations ranging between 3000 and 4500 m above mean sea level (amsl). The weather in the region is extremely foggy with a precipitation rate of about 5 m/year (Hubert, 2000). Water enters the mine through rain falling onto the subsidence zone and ground water through fractured rock. The IOZ mine, located at 3460 amsl, was brought into production in 1994 at an initial rate of 10,000 tpd. Currently, it produces 21,000 tpd. The DOZ, located at about 350m below the IOZ, started production in November 2000 at a rate of 2,000 tpd.
The model predicted the results within 1 ºC. 3 ºC at a relative humidity of 86%. 6 ºC at 87% relative humidity. This suggests that the model accurately predicted the effect of the air heater. However, to achieve this accuracy it was necessary to modify the wetness factor in the CLIMSIM program. , Lisse, The Netherlands from Ramp A to Ramp B. There is little airflow between the two ramps through the connecting crosscuts. Installing 225 kW heaters resulted in eliminating the fogging problem for the entire ramp length.
1 m3/s. 1 m3/s to the 5035 Level. The following new flow conditions, illustrated in Figure 4, were developed in the area. 3 m3/s. 0 m3/s. 1 m3/s West. 8 m3/s upramp. 9 kW fan installed for the purpose of testing. 9 m3/s flowing between 5050 level and 4900 level. 7 Figure 4. Caption of airflow distribution in the upper part of the mine during the test trial. Airflows in m3/s. 9 m3/s will leak from the shaft into the level. 0 m3/s. 07 kPa. 9 m3/s and the level flows reduced to zero. 02 kPa. Airflow and pressure conditions at 4750 level are schematized in Figure 5.