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DRMS WORST CASE RECLAMATION BOND CALCULATION EXHIBIT L <br />The worst case reclamation scenario at the Revenue Mine will take place early in the mine life, <br />after the initial regrading of the Revenue waste pile is complete. It is assumed that the <br />underground development for the mill and additional underground storage will be completed at <br />this point. It is at this time in the mine's life that the greatest amount of earthwork needs to be <br />conducted for successful reclamation. The redesigned Mine Water Pond from TR -01 in September <br />of 2013 will remain after reclamation. The Sneffels Diversion has been abandoned and will not be <br />installed. All sediment ponds will be backfilled and reclaimed. All collection ditches and diversions <br />will be maintained over the life of the reclamation process but will not be reclaimed. They will be <br />allowed to fill in naturally. Worst case reclamation details are shown below: <br />• Grading all of the disturbed areas steeper than 31-1:1V to 31-1:1V. The retaining wall near the <br />dry building will be bulldozed and backfilled as part of the reclamation process. All wood <br />and steel will be removed from the site. <br />• Topsoiling of regraded areas. All of these areas will be topsoiled to a depth of 6 inches, but <br />only enough topsoil will be available from stripping on site for 1.58 acres. The remaining <br />area (10.86 acres) will require the import of topsoil. This amount includes the area of the <br />new waste rock embankment constructed east of the portal area. <br />• All topsoil areas will need to be seeded and mulched. <br />• The underground storage portals and mill portal will have to be backfilled with an MSHA <br />seal, and a bat gate will be installed on the Revenue tunnel portal. <br />• The Filter Building is new and made of substantial concrete construction. It will remain and <br />be used for storage of equipment, bobcat, weed spray tools, weed spray chemicals, <br />erosion protection items, etc. This area of the site is designated for commercial use. <br />• The dry /office building is new and will remain after reclamation for storage of small <br />equipment, fertilizer, weed spray equipment, etc. This area of the site is designated for <br />commercial use. <br />Revenue Mine September 2013 L -1 <br />