Oyu Tolgoi Mining and Processing EIA

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Oyu Tolgoi Project Mining and Processing EIAEnvironment Factor Objective Existing Environment Potential Impact Environmental Management Predicted Outcome2. BIOPHYSICAL (continued)2.4 Water Resources Maintain the quantity ofwater resources, surface andunderground, for themaintenance of existing andpotential environmentalvalues, including ecosystemmaintenance.Surface springs are used asdrinking water by wildlifeand local livestock.Shallow wells in drainagebeds are used for herderwater supply and are integralto traditional lifestyle.Diversion of the Umdai Riverand some small streams forprotection of waste facilities,mining and infrastructure.Changes to catchmentlandforms will result inlocalized changes to streamcharacteristics.The abstraction of groundwaterfrom bore fields may reduceunconfined aquifer levels by upto 75 m.The capacity of 3 herder wellswithin a 6 km radius of themine area will be reduced dueto the drawing down ofgroundwater levels bydewatering the open pits andunderground mines.Stream diversions and stormwaterdischarges will be managed tomaintain seasonal flows downstreamof the project area.Impacted wells within thedewatering zone of influence will bereplaced with alternative watersources where herding activitiescontinue.The Borefield GroundwaterManagement Plan will be developedto minimise impacts onenvironmentally sensitive areas andto ensure abstraction is withinagreed criteria for drawdown.Water use will be minimisedthrough the implementation of waterconservation technologies whereverpractical.Surface and groundwaterresources will be maintainedfor maintenance ofecological systems.Water supplies will bemaintained as required wheregroundwater use impacts onexisting users.Localised groundwaterdrawdown from minedewatering and bore fieldabstraction .2 surface springs within theUmdai River bed are likely tobe impacted due to acombination of groundwaterdrawdown and streamdiversion.Mine closure plan will beimplemented to maintaindownstream flows of the UmdaiRiver.Prepared by ECO-TRADE LLC.,Environmental Consultants, MongoliaClient: Ivanhoe Mines Mongolia Inc(IMMI) XXKPart II. Chapter 10. Page 10
Oyu Tolgoi Project Mining and Processing EIAEnvironment Factor Objective Existing Environment Potential Impact Environmental Management Predicted Outcome2. BIOPHYSICAL (continued)2.4 Land and Soil To maintain the integrity,environmental values andecological function of thesoils and landforms.Localized soil disturbancewithin the Project Arearesulting from geologicalexploration activity.Surface, underground mining,stockpiles and tailings depositswill disturb soil cover withinthe 1300 Ha project area.Implement site rehabilitation plans,mine closure plans and watermanagement plans in a manner thatincludes erosion sensitive design.Maintain existing soilproductivity and improvesoil stability post miningthrough exclusion of grazing.High rates of wind erosion offragile soils during seasonalwind storms.Risk of soil erosion from roadsin and surrounding the projectarea.Implement ARD management plansand procedures to manage andprevent contamination of soils.Long term soilcontamination risks areminimized and managedRisk of soil contamination fromARD impacts of mine wasterock and tailings.Changes to landforms resultingfrom stockpiles, tailingsdeposition and pits.Potential for soil contaminationresulting from spills and leaksof hazardous chemicals andfuels.Some loss of soil productivityduring mine clearing andrehabilitation works.Mine closure and rehabilitationplans need to ensure final landformsare stable, safe and cognizant ofexisting landscape values.Implement rehabilitationmanagement plans to ensure soilconservation.Implement hydrocarbon andhazardous chemical managementprocedures to prevent accidentalloss.Final landform of ProjectArea is non-eroding, stableand safe.Prepared by ECO-TRADE LLC.,Environmental Consultants, MongoliaClient: Ivanhoe Mines Mongolia Inc(IMMI) XXKPart II. Chapter 10. Page 11
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