file: project: edate: depth vs 6(6) vs non and volume .fig-ath.ppt n effectwe pit radius vs depth

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SIMULATEDWATER TABLE

CYLINDERREPRESENTINGPIT AT TIME = T> T1

FIGURE E4-3SIMULATION OF A PIT LAKE AS ASET OF EXPANDING CYLINDERS

SIMULATEDWATER TABLE

ACTUALWATER TABLE

CYLINDERREPRESENTINGPITATTIME=T1

_-PITGROUNDSURFACE

ACTUALWATER TABLE

SIMULATEDWATER TABLE

PITGROUNDSURFACE

ACTUALWATER TABLE

CYLINDERREPRESENTINGPITATTIME=T3>T2

SHEPHERD MILLERINCORPORATED

Date: DECEMBER 1999

Project: I 00029\TASK5

File: CYLINDER

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SHEPHERD MILLERINCORPORATED

FIGURE E4-6CONTINENTAL PIT LAKE

WATER BALANCE AT STEADY STATE

DECEMBER 1999

100029\TASK5

WBAL-CON

DIRECT PRECIPITATION = 52.7 gpm

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EVAPORATION 1606 gpmPIT WALL

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N CONTINENTAL PIT LAKE

Date:

Project:

File:

DIRECT PRECIPITATION = 19.2 gpm

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WALLEVAPORATION 58 5 gpmUNOFF = 10 1 Pm

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FIGURE E4-7 I Date: DECEMBER 1999SHEPHERD MILLER WATER BALANCE AT STEADY STATE File: WBAL-CEX

A EXPANDED CONTINENTAL PIT LAKE Project: 100029\TASK5NCORPORATED

I

INCREASEINPLOW BASE CASE DDECRA5EThFL0W

FIGURE E4-8 Date; DECEMBER 1999SENSITIVITY OF WATER BALANCECOMPONENTS TO FINAL PIT LAKE Project; 1OOO29.

PREDICTIONS File; FIG-ATV.PPT

C

60

40

PARAMETER

SHEPHERD MILLER

Al IACHMENTSTOAPPENDIX E

WATER BALANCE MODELS FOR THE PROPOSEDCONTINENTAL MINE EXPANSION PROJECT,

GRANT COUNTY, NEW MEXICO

Prepared for:Cobre Mining Company, Inc.do Chino Mines Company

No.14 Chino BoulevardHurley, New Mexico 88043

Prepared by:Shepherd Miller, Inc.

3801 Automation Way, Suite 100Fort Collins, Colorado 80525

December 1999

SHEPHERD MILLERICORPCRATED

ATTACHMENTS TO APPENDIX E

WATER BALANCE MODELS FOR THE PROPOSED CONTINENTAL MINEEXPANSION PROJECT, GRANT COUNTY, NEW MEXICO

TABLE OF CONTENTS

INTRODUCTION e-1

PROBLEM STATEMENT AND OBIECTIVES e-1

WATER BALANCE MODELING APPROACH e-2

El-l.O CLIMATE El-i

El-l.l AvailableData El-i

El-l.2 Climate at the Continental Mine El-i

E1-i.2.l Precipitation and Temperature El-i

El-l.2.2 Evaporation E1-3

Ei-l.2.3 Runoff and Infiltration Ei-4

El-2.O REFERENCES El-i

E2-i.O INTRODUCTION: TAILINGS POND E2-1

E2-1.1 Objectives E2-1

E2-l.2 Approach E2-i

E2-2.O CALCULATIONS E2-4

E2-2.i 1997 Tailings Pond Facility Water Balance E2-4

E2-2.2 1997 Flows to the Fierro Area and Lower Bedrock Units E2-5

E2-2.3 End-of-Mining Tailings Pond Water Balance Including Flows to the FierroArea and Lower Bedrock Units E2-7

E2-2.4 End-of-Mining Water Balance E2-8

E2-2.5 Post-Closure Tailings Pond Water Balance Including Flows to the Fierro

Area and Lower Bedrock Units E2-8

E2-3.O SUMMARY E2-1i

E3-i.O INTRODUCTION: U1TDERGROUND WORKINGS E3-i

Cobre Mining Company, Inc. Shepherd Miller, Inc.

p:UO0029repori-drafl-raappcndx-eanachs-dited.doc e-i December 1999

E3-2.O CALCULATIONS.E3-2

E3-2.1 Evaluation of the Current Ground Water Inflow Rate E3-2

E3-2.2 Prediction of the Future Ground Water Inflow Rate E3-6

E3-2.3 Ev

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