1993-03-30_REVISION - M1977378 ‎(2)‎

• Permit No: M1977378
• IBM Index Class Name: Revision
• Doc Date: 3/30/1993
• Doc Name: Evaluation of Hydraulic and Hydrochemical Aspects of Proposed Bulkheads
• From: Sunnyside Gold Corp.
• To: DMG
• Type & Sequence: TR14
• Media Type: D
• Archive: No

TABLE OF COIVTE/VTS
SECT/ON
PAGE
1.0 EXECUTIVE SUMMARY ................ . ............... 1
2.0 INTRODUCTION ..................................... 5
2.1 Location and Brief Description of the Sunnyside Mine ....... 5
2.2 Statement of the Problem .......................... 5
2.3 Reports Prepared to Evaluate Impacts of Proposed Bulkheads
at the Sunnyside Mine ............................. 8
2.4 Purpose and Scope ............................... 9
3.0 GENERAL HYDROGEOLOGY OF THE SUNNYSIDE MINE ......... 10
3.1 Geology Pertinent to Ground-Water Flow and Chemistry .... 10
3.2 Bedrock Permeability ............................. 14
3.3 Pre-Mining Potentiometric Surface ................... 18
3.4 Pre-Mining Direction of Ground-Water Flow ............. 19
4.0 HYDROLOGY AFTER PROPOSED BULKHEADS ARE INSTALLED ... 22
5.0 ESTIMATION OF HYDRAULIC HEAD AND HYDRAULIC CONDUCTIVITY
FROM FLOW TESTS ................................. 27
5.1 Description of the Drill Holes Used for Flow Testing ....... 27
5.2 Flow Test Methodology ........................... 28
5.3 Measurement of Hydraulic Head ..................... 29
5.4 Estimate of Hydraulic Conductivity .................. . 31
6.0 RATE OF FLOODING OF MINE WORKINGS .................. 34
6.1 Estimate Using Volume of Workings and Constant Flow ..... 34
6.2 Estimate Using aGround-Water Flow Model ............. 36
7.0 RATE OF LEAKAGE AROUND BULKHEADS .................. 40
7.1 Equilibrium Water Level Behind the Bulkheads ............ 40
7.2 Permeability at Proposed Bulkhead Sites ............... 41
7.3 Leakage in the Immediate Vicinity of the Bulkheads ........ 43
8.0 MOVEMENT OF WATER FROM FLOODED WORKINGS
TO THE SURFACE ................................... 48
8.1 Nature of the Discharge from Flooded Mine Workings ...... 48
8.2 Estimated Rate of Flow through Flooded Mine Workings .... 51
8.3 Transit Time for Flow from Mine Workings to the Surface ... 55
s unn y1 wpltraci122511Mar 1993. Rpt
Hsi SI~ilOtl HYDRO-SERRCH