REV00143

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Date: 3/24/2000
• Doc Name: PROJECT DESCRIPTION AMENDMENT 8 CRESSON PROJECT M-80-244
• Type & Sequence: AM8
• Media Type: D
• Archive: No

5.7.1.4 Stability ................................................ ... 59
• 5.7.2 AGOSA ......................................................... ... 60
5.7.2.1 General ................................................. .. 60
5.7.2.2 Surface Water Management ......................... .. 60
5.7.2.3 Stability ................................................ ... 60
5.7.3 Deposition of Overburden into Cresson Mines ............ ... 61
5.7.3.1 General ................................................. ... 61
5.7.3.2 Construction ........................................... ... 61
5.8 HauUAccess Roads ................................................ .... 62
5.8.1 Access Roads ................................................... ... 62
5.8.2 Haul Roads ..................................................... .... 63
6.0 VALLEY LEACH FACILITY ................................................ ... 66
6.1 Introduction and General Characteristics ............................ .. 66
6.2 Phase IV VLF Design Components .................................. .. 67
6.2.1 Underdrain System ............................................. . 67
6.2.2 Ore Liner System .............................................. .. 68
6.2.3 Pregnant Liner System ........................................ .. 69
6.2.4 High Volume Solution Collection System ................. .. 70
6.2.5 Low Volume Solution Collection System .................. .. 7l
6.2.6 Leak Detection System ........................................ .. 71
6.2.7 Settlement Analysis ............................................ . 72
6.2.8 Stability Analysis .............................................. .. 73
6.2.9 External Pond(s) ............................................... .. 73
• 6.2.10 Partial Unloading and Reloading of Valley Leach
..
aci ity .......................................................... _
.. 7~
6.3 Construction Sequence ................................................. .. 76
6.3.1 Clearing and Soil Stripping ................................... . 76
6.3.2 Site Regrading .................................................. . 76
6.3.3 Underdrain System ............................................ .. 77
6.3.4 Construction of Leak Detection, Liner, and
Collection Systems ................................... .. 77
6.3.5 Restrictions on Liner Installation ............................ .. 79
6.3.6 Construction Drawings, Construction Specifications,
Inspection, and Certification ......................... . 79
6.4 Ore Loading ................................................................. . 80
6.5 Solution Application ....................................................... . 80
6.6 Valley Leach Facility Water Balance ................................... . 81
7.0 PRECIOUS METALS RECOVERY FACILITY ........................... .. 83
8.0 SUPPORT FACILITIES ........................................................ . 85
8.1 Maintenance Facility .................................................... . 85
8.2 Power ..................................................................... .. 85
8.3 Water Supply ............................................................ .. 86
• 8.4 Security and Signs ....................................................... . 87
TOC-ii