1993-03-30_HYDROLOGY - M1977378

• Permit No: M1977378
• IBM Index Class Name: HYDROLOGY
• Doc Date: 3/30/1993
• Doc Name: Preliminary Characterization of the Hydrology and Water Chemistry- I
• From: Simon Hydro-Search
• To: San Juan County Mining Venture
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

TABLE OF CONTENTS
SECTION PAGE
1.0 EXECUTIVE SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Location and Brief Description of the Sunnyside Mine . . . . . . . . . . . . 4
2.2 Statement of Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Scope of Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.0 HYDROLOGY PRIOR TO MINING . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Pre-Mining Ground-Water Hydrology . . . . . . . . . . . . . . . . . . . . . . 7
3.1.1 Geology Pertinent to Ground-Water Flow and Chemistry . . . . . . 7
3.1.2 Bedrock Permeability . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.3 Bedrock Storage Coefficient . . . . . . . . . . . . . . . . . . . . . . 17
3.1.4 Pre-Mining Potentiometric Surface . . . . . . . . . . . . . . . . . . 18
3. 1.5 Pre-Mining Ground-Water Chemistry . . . . . . . . . . . . . . . . . 21
3.1.6 Recharge to the Ground-Water System . . . . . . . . . . . . . . . . 27
3.1.7 Discharge from the Ground-Water System . . . . . . . . . . . . . . 28
3.2 Pre-Mining Surface-Water Hydrology . . . . . . . . . . . . . . . . . . . . . 28
3.2.1 Surface-Water Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.2.2 Surface-Water Chemistry . . . . . . . . . . . . . . . . . . . . . . . . 29
4.0 PRESENT HYDROLOGY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.1 Present Ground-Water Hydrology . . . . . . . . . . . . . . . . . . . . . . . 31
4.1.1 Bedrock Permeability . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.1.2 Bedrock Storage Coefficient . . . . . . . . . . . . . . . . . . . . . . 32
4.1.3 Potentiometric Surface . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.1.4 Ground-Water Chemistry . . . . . . . . . . . . . . . . . . . . . . . . 33
4.1.5 Recharge to the Ground-Water System . . . . . . . . . . . . . . . . 33
4.1.6 Discharge from the Ground-Water System . . . . . . . . . . . . . . 34
4.2 Mine Hydrology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.2.1 Open Channel Flow Within the Underground Workings . . . . . 35
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