REP33384

• Permit No: M1977342
• IBM Index Class Name: Report
• Doc Name: PROBABILISTIC SEISMIC HAZARD ANALYSIS OF HENDERSON TAILING DAM NORTH CENTRAL COLO
• Media Type: D
• Archive: No

TABLE OF CONTENTS

Introduction
Location of the Valley
Climatology
History of Urad Valley
uisturbance of Surface Land of the Valley Prior to 1969
Pre-AMAX (1859 to 1960)
Mining
Logging
Forest Fire
Avalanches
Post-AMAX (1961 to 1969)
Disturbance of Surface Lands of the Valley After 1969
Summary of Present Disturbances
Environmental Resources Affected by the
Surface Disturbances
Vegetation of the Valley
Timber
Water
Air
Wildlife
Outdoor Recreation and Scenic Resources
Specific Programs to Reduce Impact On Environmental
Resources and Reclamation Methods Successfully
Employed at the Urad Mine
Timber
Water
Water ey-Pass Facilities
Tailing Stabilization
Temporary Stabilization for Fugitive Dust Control
Permanent Stabilization
Revegetation Reclamation
The Ultimate Goal
Problems Associated With Revegetation
Page Page
Topsoil 23
1 Hydromufching 23
1 Maintenance Fertilization 23
1 Rc:cgc:aticli ^cScai Gi Z3
5 Discussion of Potential Soil Amendments 23
6 Topsoil 24
6 Manure 24
8 Sewage 24
8 Dried Poultry Waste 24
8 Sawmill Wastes 25
9 Straw Mulch 25
13 Chemical Fertilizer 25
13 A Combination of Amendments 25
Past Research 25
15 Present Research 26
16 High Altitude Seed Source 27
17 Literature Search 28
17 Methods to Monitor Effects of Surface Disturbances 29
17 Reclamation Plan 32
1 ~ Reforestation 32
17 Dead Timber Clean-Up 33
Road, Reservoir Dam Faces, and Borrow
Area Reclamation 33
19
Reclamation of the Mine Yard and Refuse Area
33
20 Proposed Roadside Park 33
20 Reclamation of Mine Waste on Red Mountain 34
20 Tailing Area Stabilization and Reclamation 34
21 Stabilization With Rock 34
21 Soil Amendments 35
21 Tailing Area Reclamation Sequence 36
22 Dismantling of Equipment 36
22 Flood Control 36
22 Timetable and Economics 37