2012-03-07_REPORT - M1977342 - Laserfiche WebLink

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Annual Report — 2011 Henderson Mine and Mill Reclamation Activities Permit No. M- 1977 -342 The target species treated property-wide include: Canada, musk & plumless thistle, Oxeye daisy, Yellow Toadflax, Houndstongue, and Mayweed Chamomile. These species were treated with Tordon, 2,4 -D, Milestone, Weedestroy and Induce. Additionally, all fuel storage locations (gasoline, diesel and propane) were treated with a Throttle XP and Roundup (soil sterilizers to prevent any vegetative growth). 2.3.2 — Groundwater Data Groundwater data for well MLGW - 7 for Henderson Mill is contained in Attachment B. 2.3.3 — Flood Storage Capacity Analysis of flood storage capacity in the Mill tailings impoundment was carried out by W.W. Wheeler, per DRMS requirements stipulated for Technical Revision (TR) 14. These are included as Attachment D. 2.3.4 — Interceptor Canal Improvements No significant repairs or modification were made to the Interceptor canal. All intercepted flows are currently being routed through the higher (ultimate- elevation) interceptor canal. The majority of the pre- existing lower canal has been formally closed, backfilled and is currently being inundated as the tailing elevation increases. 2.3.5 — Lower Flood Bypass Following the closure of the Lower Flood Bypass, no other developments have been made. The closure, to date, has been effective. 2.3.6 — 3 Dam Seepwater Line Leak - Down Test The annual 3 -Dam seepwater line leak -down test was attempted late in the year, but was not successfully completed during 2011 due to a leaking valve set. Efforts are currently in place to have that valve replaced and the line re- tested. 2.3.7 — 3 Dam Seepwater Collection The number 3 Tailings Dam seep water collection system was completed in 2011 and is currently being commissioned. The system collects water seeping through the tailings dam and directs it to the mill process water system. 2.3.9 — Lime Slaker Lime slaker construction was completed in 2011 and is currently in operation. The pH of process water has increased, and is currently circum - neutral. 3.0 Anticipated 2012 Activities Reclamation in 2012 will include additional topsoil salvage and stabilization at the Mill. At the Mine, planning is currently underway to initiate reclamation of the area near 1.2 Pond. Activities for 2012 could include regrading outslopes of overburden material along the West Fork of Clear Creek, removal of sludge from 1.2 Pond and relocation of fuel tanks. Page 3