Oyu Tolgoi Mining and Processing EIA

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Oyu Tolgoi ProjectMining and Processing EIA4. Air quality4.1 Baseline Air QualityBaseline assessments of the air quality of the Oyu Tolgoi Project Area were carried out in July 2002 byEco-Trade Co Ltd. Measurements of average concentrations of dust, SO 2 and NO 2 were taken at sevenlocations within the Project Area. Additional particulate monitoring was conducted in 2003 and 2004after completion of the baseline report. The additional monitoring was undertaken to collect baselinedata for airborne concentrations of dust particles less than 2.5 micron in diameter (PM 2.5 ) and that lassthan 10 micron diameter (PM 10 ). A summary of the sampling undertaken at Oyu Tolgoi is provided inTable 4.2. The results of air quality sampling are summarized in Appendix 4.1 and 4.2.The baseline air quality surveys undertaken within the Project Area identified high dust levels,particularly near roads and in heavily disturbed areas like the exploration camp and at operating drillsites. Results of the tests and laboratory analyses indicates that air in the Oyu Tolgoi area is unaffectedby industrial or other emissions as would be expected for such an isolated location. The concentrationsof SO 2 and NO 2 are within expected background concentrations and well below the guidelines set bythe National Standard of Air Pollution Parameters, (NSAPP). Table 4.2 shows the National standardsused in Mongolia.Regional air quality in the Gobi is affected by high dust concentrations associated with seasonal duststorms. Dust concentrations are increased further in areas impacted by overgrazing, vehicle traffic andmineral exploration activity. The sampling undertaken within the Project Area identified high dustlevels near roads and in heavily disturbed areas like the camp and at operating drill sites. It is noted thatdust concentrations in undisturbed areas also experienced elevated levels due to the impact of strongwinds over the vast desert areas.The monitoring of ambient dust concentrations indicate that national and international standards areregularly exceeded within and beyond the Project Area. The dust monitoring results of 21 June 2003collected 12 hour average dust concentrations for 3km north and 3km south of the Project Area during atypical dust storm event. The results, 0.411 mg/m 3 for the southern site and 0.530 mg/m 3 at thenorthern site, substantially exceed the National and World Bank standard of 0.15 mg/m 3 measured overa 24 hour period for ambient air quality.Wind is usually present at the site, predominantly from the north. Very high winds are accompanied bysandstorms that often severely reduce visibility for several hours at a time. Based on regionalinformation, windstorms can have gusts up to 50 m/s. Snowstorms and blizzards with winds up to 40Prepared by ECO-TRADE LLC.,Environmental Consultants, MongoliaClient: Ivanhoe Mines Mongolia Inc(IMMI) XXKPart II. Chapter 4. Page 2
Oyu Tolgoi ProjectMining and Processing EIAm/s occur in the Gobi region for 5 to 8 days each winter. Spring dust storms are far more frequent andcan continue through June and July. The average storm duration is 6 to 7 hours. An average of 120hours of dust storm activity and 220 hours of drifting dust are recorded each year. The number of dustdays per year is shown in Table 4.2.Table 4.1 Summary of Air Quality Sampling Events at Oyu TolgoiSampling EventBaselineEnvironmentalStudy July andAugust 2002ResultsReportedAppendix4.1ParametersSampledTotalSuspendedParticulates(TSP), SO 2 ,NO 2Coordinates of Samplings ZonePoints650990 / 4765357 Far east Oyu650842 / 4764801 North Oyu650860 / 4764118 Central OyuSouthwest650351 / 4763164Oyu651280 / 4762876 South OyuNear existing650220 / 4763397camp648981 / 4765216 AirportDust Monitoring10-27 June 2003Appendix4.1TSP, PM 2.5 ,PM 10651000 / 4767000654000 / 4764000651000 / 4760000648000 / 4764000North 3 kmfrom OTcampEast 3 kmfrom OTcampSouth 4 kmfrom OTcampWest 3 kmfrom OTcampDust MonitoringApril to June 2004Appendix4.2TSP, PM 2.5 ,PM 10648066 / 4764388 west650630 / 4767015 north654112 / 4764175 east652649 / 4759876 south650144 / 4763595 camp648058.63 / 4765657.25 Northwest652610.44 / 4766652.37 Northeast654162.27 / 4762088.35 Southeast650700.08 / 4760869.31 Southwest650108.12 / 4764097.00 Weather StnTable 4.2 Frequency of Dust Storms in the Gobi DesertMonth Jan Feb Mr Apr May Jun Jul Aug Sep Oct Nov DecNoDaysof0.7 1.0 2.4 4.7 4.1 1.5 1.0 0.4 0.6 0.7 1.9 0.7Prepared by ECO-TRADE LLC.,Environmental Consultants, MongoliaClient: Ivanhoe Mines Mongolia Inc(IMMI) XXKPart II. Chapter 4. Page 3
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