Upper Workings. Waste Rock. Adit. Millsite
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1 Hydraulic Adit Plug Closure World s Fair Mine, Patagonia, Arizona Region 3 Coronado NF Mine Design, Operations & Closure Conference May 1-5, 2011 Allan Kirk Matt Wetter Nathan Stormzand Eli Curiel, USFS
2 General Location Map
3 1915 Photo by F.C. Schrader, USGS Bulletin 191
4 World s Fair Mine Overview Today Upper Workings Adit Waste Rock Waste Rock Millsite
5 World s Fair Mine Harshaw Mining District in the Patagonia Mountains Mined from Ag - Pb - Cu - mine Produced 30,000 tons of 58 opt Ag, 6.6 % Pb, 0.7% Cu, minor gold /zinc. North-south trending vein system dips at about 80 o to SW. Occurs at contact of quartz diorite intrusive and rhyolitic volcanic flows
6 Mined along strike for about 600 feet Mine Workings Plan Map Over a dip-slope distance of about 1,000 feet 15,000 ft of drifts, tunnels, stopes, shafts, and winzes
7 Mine Workings 3-D Model Developed to a depth of 450 feet below the main haulage level adit
8
9 Site Visit to Adit Portal All you could see in feet to drop-out and thigh deep water ph = 3.0 Elevated metals
10 The (1.8) Million Dollar Question Given what you see - can you provide us with a firm fixed price for the cost to reopen this mine, set two hydraulic plugs, and reclaim the site? Simple answer: No Consultant s answer:.well Sure!
11 Water Quality Table 1. Dissolved metal concentrations (mg/l) from monitoring locations 1. World s Fair Mine Metal Arsenic Barium Cadmium Chromium (III) Copper Iron Lead Manganese Mercury Nickel Selenium Silver Zinc Alum Gulch Upstream Adit Discharge Alum Gulch Downstream N/R N/R < < < N/R N/R N/R Adapted from USGS (2003). Data are believed to be means from 16 monitoring events. N/R = Not reported Red font = exceeds human health standards
12 Metals Loading (1) 0.25 Concentration (mg/l) Barium Cadmium Lead Nickel 0 Alum Gulch Upstream Adit Discharge Alum Gulch Downstream
13 Metals Loading (2) 120 Concentration (mg/l) Iron Manganese Zinc 0 Alum Gulch Upstream Adit Discharge Alum Gulch Downstream
14 World s Fair Adit Flow and Water Quality Flow typically 3-5 gpm, maximum 18 gpm ph Geochemically degraded waters with respect to Cd, Cu, Fe, Pb, Mn, Ni, and Zn Significant source of loading to Alum Gulch However, sources other than the World s Fair Mine adit are responsible for the majority of metal loading to Alum Gulch
15 Reasons to Conduct Evaluation and Construct Closure Water quality - Low ph and metals concentration and loading to Alum Gulch Closure principally to eliminate a point source discharge from the adit portal.
16 RFP to stem the flow of water from the Adit Tetra Tech chose to - Evaluate possibility of using two hydraulic, water tight plugs to stem the flow. Objectives: Eliminate or reduce the flow of contaminated water from adit Eliminate or reduce metals loading to Alum Gulch from adit Elimination of a point source discharge in exceedence of water quality standards and in volition of the Clean Water Act (for discharging without a permit)
17 Schematic Sketch of Two-Plug System
18 Infrastructure to Support Project
19 Eli Curiel, USFS OSC and a TT Exploration (?) Geologist
20 Nathan Stormzand TT Civil Engineer
21 Rich Dombrouski TT Geotechnical Engineer
22 Closure Plan
23 Adit Closure Plan Map
24 Adit Plug Details (after Bogert, 2003)
25 6-inch steel H-beams
26 Faced with 2 x 6 Nailing Strip
27 Nailer faced with 3 lagging on inside of Bulkhead
28 Jimmy Hoffa Window
29 Cement pumping lines and grout pumping lines
30 Perimeter of lagging packed with burlap and grouted
31 Atlas-Fausett Contracting, Inc. Frank Fausett Ron Short
32 Pumper and Concrete Trucks
33 After the Concrete Pour ~ 30 cubic yards Prior to grouting the interior plug station arch
34 Greatest Job Safety Risk
35 Adit Closure Plan and Infiltration Basin
36 Constructing Dam near Portal
37 Piping Through Dam
38 Mixing Cement for Dam - Atlas Fausett Mobile Mixer (just kidding)
39 Dam Partway Through Pour
40 Piping Behind Dam Not Perforated yet
41 Beginning of Adit Surface - Closure Looking from Portal
42 Goin Back for More Rocks
43 Final Underground Portal Closure
44 Infiltration Basin
45 Reclaimed Portal Site
46 Reclaimed Waste Rock Dump
47 Closure Effectiveness and Cost Reduction in flow 100% No metal loading from adit source Uses existing engineering technology Cost of: Engineering design Rehabilitating the adit Construction of plugs and closure of site - Relatively high - but one time cost of $1,105,000
48 Comparison Glengarry Mine vs. World s Fair Mine World s Fair Mine, AZ Mine rehab to 500 Two hydraulic plugs Limited plug backfill Portal closure Infiltration basin 100% flow reduction Cost = $1,105,000 Glengarry Mine, MT Mine Rehab to 1900 Shaft rehab to 290 Shaft collar grout curtain Shaft Plug and backfill Four hydraulic plugs Extensive plug backfill Underground fault grouting Portal Closure 98% flow reduction Cost = $2,900,000
49 Most Importantly Hydraulic Plug Mine Closures Can Provide A Walk-Away Solution
50 Questions?
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Our School Logo Water Supply, Distribution and Storage Sabana Grande, Nicaragua Project Description: Sabana Grande, Nicaragua reached out to our team of forty student engineers to provide a new water supply,