2012-08-13_REVISION - M1982090 (2)

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CBCI intends that the discharge conveyance be a permanent feature on its private property. Therefore demolition of the conveyance system is not included in the reclamation plan in Section 6.0. Section 4.0 Grading and Equipment Storage Grading and an equipment storage building will be required to accommodate repairing the 14L portal and rehabilitating the 14L drift. Two primary active areas will be graded flat, or nearly flat, as shown in Figure 2. Graded Area No. 1 (GA1) will be approximately 1.3 acres, and currently has a very gentle grade of —1:15 (V:H). To grade this area to nearly flat will require displacing approximately 3,500 cubic yards of cap materials. Up to 3,000 cubic yards of cap materials will be stockpiled up- gradient of GA -1 to match the current slope of —1:2 (V:H) of the area designated as "Stockpile 2" in Figure 2. Approximately 500 cubic yards will be stockpiled in a long sinuous berm parallel to Imogene Creek, as shown in Figure 2. A storm ditch will be installed along the north and east boundaries of GA1 to route stormwater to the sedimentation pond, as shown in Figure 2. Graded Area No. 2 (GA2) is approximately 0.9 acres. Even though GA2 is already flat, it will require displacement of approximately 950 cubic yards of cap materials that have been revegetated. This cap material will be stockpiled in a long berm ( "Stockpile 4 ") along the southeast boundary of GA2, as shown in Figure 2. GA2 is already equipped with a stormwater control ditch and pond along the southeast boundary. The stormwater ditch will be modified slightly to accommodate space for Stockpile 4, and will be maintained to meet or exceed its current function. An equipment storage building will be erected near the center of GA2. The building is anticipated to be an 80 foot wide by 100 foot long rectangular steel structure. It will be oriented to adjoin the snow shed covering the track that leads from the 14L portal, as shown in Figure 2. The building will be built to comply with all Ouray County building codes. Ouray County building codes require the following structural design criteria: the foundation and/or footers must be at least 40 inches below ground level; the shear strength of the building must accommodate a wind load of 90 miles per hour; and the roof snow load at an elevation of 9,800 feet (the elevation of 14L) must accommodate a minimum of 106 pounds per square foot. CBCI will comply with all other Ouray County building codes and obtain a building permit, if required, prior to construction of the building. The intended building site was chosen because of its proximity to the 14L portal and it is not threatened in any way by snow slides. Equipment and supplies to be relied upon for grading and erecting the storage building are included in Attachment F. A description and cost estimate for reclamation of the graded areas and stockpiles is included in Section 6.0. All of the activities proposed in this TR will be conducted on private lands owned by CBCI. Once built, the equipment storage building is intended to be a permanent improvement on CBCI's property. Therefore, demolition of the building is not included in the reclamation plan in Section 6.0. Section 5.0 Portal Construction and Drift Rehabilitation The 14L of the Camp Bird Mine is the highest infrastructure -priority of the mine The —14,000 foot tracked drift was originally driven in 1915 and was used as the primary access into the mine for over 75 years until the mine was closed in the early 1990s. Sometime during the past 20 years the 14L portal collapsed which essentially restricted access to all of the underground workings of the Camp Bird Mine. Technical Revision, Camp Bird Mine 112 Permit (Permit No. M- 1982 -090) Page 7