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Annual Report - 2010 <br />Henderson Mine and Mill Reclamation Activities <br />Permit No. M-1977-342 <br />2.0 Henderson Mill <br />2.1 Disturbance <br />Approximately 54 acres were disturbed during 2010. A total of 16 acres were disturbed from <br />incremental tailings impoundment filling (4 acres per quarter, on average), and 48 acres were <br />disturbed as a result of topsoil salvage and piling activates. This activity included preliminary <br />road construction to the new South Stockpile approved as part of Amendment AM-06. <br />2.2 Reclamation <br />Interim stabilization efforts included the salvage of 232,350 cubic yards of topsoil/growth media <br />from inundation areas along the upstream side of the tailing impoundment. The material was <br />placed in the north stockpile, which is situated on the northern end of the impoundment. <br />2.3 Other Activities <br />2.3.1- Weed Control <br />EcoRx, Henderson Mill's contractor for weed management, treated 242 acres at the Henderson <br />Mill site, 1.25 acres associated with US Forest Service easements, and approximately 7 acres at <br />the inactive Kremmling Railhead facility. The primary focus of EcoRx's efforts consistently <br />relate to areas of disturbance (typically surrounding the topsoil stockpiling efforts), thus ensuring <br />that fledgling growth is mitigated and made increasingly more manageable. <br />The target species treated include: Canada, musk & plumless thistle, Oxeye daisy, Yellow <br />Toadflax, Houndstongue, and Mayweed Chamomile. These species were treated with Tordon, <br />2,4-D, Milestone, Weedestroy and Induce. <br />Additionally, all building perimeters and fuel storage locations (gasoline, diesel and propane) <br />were treated with a Throttle XP and Roundup (soil sterilizers to prevent any vegetative growth). <br />2.3.2 - Groundwater Data <br />Groundwater data for well GW-7 for Henderson Mill is contained in Attachment B. <br />2.3.3 - Flood Storage Capacity <br />Semi-annual analyses of flood storage capacity in the Mill tailings impoundment were carried out by <br />W.W. Wheeler, per DRMS requirements stipulated for Technical Revision (TR) 14. These are included <br />as Attachment C. <br />2.3.4 - Interceptor Canal Improvements <br />Additional repair and maintenance along the interceptor canal was performed to stabilize slopes and <br />increase vegetative growth. The lower interceptor canal was also officially decommissioned. This was <br />Page 2