2020-09-08_REVISION - M2012032 (2)

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l LUFMY SILI ER 9htiE5 trailer(s) and sold or disposed of off-site. Remaining amounts of the inert materials of the structure will be dismantled and used as backfill for the mine portals. 3. DRMS Comment:Section 3 Reclamation Plan Update Section 3 references a modified reclamation plan map labeled as Map F-I however Map F-1 was not submitted. Please submit the revised Map F-1 and take into account all applicable items in this review that should be reflected on the revised map. Please also note that the features on the updated Reclamation Plan Map F-1 should include but is not limited to structures to remain post-reclamation, surface features such as ponds to remain post-reclamation and the final topography of all reclaimed areas. If necessary, several maps may be used to convey the required information. OSMI Response: Map F-1 was included with the original TR-I I application submittal however, during the course of developing responses to DRMS's comments, OSMI realized there were errors in Map F-1 including an incorrect permit boundary as well as depiction of Diversion Ditch #1,which has not been constructed and there are currently no plans to construct such a channel. A copy of the corrected Map F-1 is provided in Attachment 2 OSMI reviewed other past submittals to DRMS and discovered there were several drawings submitted with the same error. OSMI will be submitting corrected drawings under a separate cover letter. 4. DRMS Comment:Section 3.3 Topsoil Placement and RevePetation The narrative of this section proposes a revised topsoil replacement depth of 6 inches in areas to receive topsoil and ultimately be revegetated, and all other areas to be capped with waste rock. In the revised map listed in Item 3 of this review,please depict all areas to receive topsoil and the areas to be capped with waste rock. The narrative also states that the previous area to receive topsoil is 9.3 Acres however records indicate the previously proposed areas to be top soiled at 12.43 Acres. And Table E-3 indicates that the total area in Acres to receive imported topsoil is 4.74 Acres. Please clarify in a narrative and associated map the total number of acres of the areas to be capped with waste rock and areas to receive topsoil and revegetation. Please also indicate, the quantity of topsoil that already exists on site, and how much will be imported to guarantee the total amount of topsoil required for reclamation is stored on site. OSMI Response: There are approximately 5.43 acres that require topsoil per the updated Reclamation Plan and per the TR-I I narrative. This 5.43 acres is comprised of 4.74 acres for the Atlas and the Revenue-Virginius Tailings Storage Facilities and non-waste areas plus approximately 0.69 acres for reclamation of the three shaft areas. Materials for the shaft reclamation will come from the berms that will be constructed when the shafts are developed. The remaining 4.74 acres will require imported topsoil,which equates to approximately 4,001 cubic yards of soil that Ouray Silver will need to import for reclamation of the Atlas and Revenue-Virginius Tailings Storage Facilities. DRMS is correct that early permit documents identify 12.43 acres requiring topsoil. However, as part of Technical Revision 4, the disturbance footprint of the Atlas TSF was reduced by 3 1 P a g e