2019-04-13_REVISION - M1984168 (9)

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WILLIAMS FORK MINING COMPANY SAND AND GRAVEL SITE Exhibit D.......... Sand and Gravel Operation Mining Plan The Williams Fork Mining Company gravel permit area encompasses approximately 83.3 acres and includes 9.9 acres previously permitted under the limited impact criteria of rule 3, 2CCR407-1. The area includes the actual mining area, stockpile areas, drainage and sediment control, processing and loading areas, and haulroads. The actual extraction area is divided sequentially into eight"mining areas" as shown in Exhibit C. Table D-1 describes the depth, thickness and size of each sub-area, the type of overburden to be removed and the approximate timing of the mining sequence. The sequence may vary depending on future gravel requirements. Topsoil and overburden removal and gravel extraction activities were completed in Mining Areas 1, 2 and 3 by the end of 1996. Mining commenced in Area 1 in 1984 and was completed in Area 3 in 1996. These three areas combined now forma single open pond area that was reclaimed during 1998, as discussed in Exhibit E. Gravel extraction activities began in Mining Area 4 in 1997. Backfilling into the Mining Areas 1, 2, and 3 pit area with boxcut overburden from Mining Area 4 was also accomplished during 1997. There is an undetermined quantity of gravel remaining in Mining area 6 that was left at the end of operations in 2009. This area is now under water and, therefore, the existing gravel quantity has not been verified. Mining of this remaining reserve in area 6, as well as reserves identified in new mining areas 7 and 8, are proposed for development during 2019 and 2020, with the possibility of some mining occurring in 2021 (see Exhibit C map). The areas depicted in Mining blocks 7 and 8 may vary in size depending on actual gravel reserve thicknesses encountered. The area between mining blocks 7 and 8 is considered potentially too high in strip ratio to economically recover and may therefore be left in place in greater or lesser areal extent as recovery dictates. Topsoil and overburden material is removed and stockpiled with loaders or scrapers and dozers. The product is excavated with front-end loaders and trammed to the processing areas where it is fed directly into the crusher and stockpiled or else stored in a pit-run sand and gravel stockpile. The location of the processing area is variable and as near to the extraction area as possible to minimize tramming distance. A list of equipment requirements is shown in Table D-2. All surface water runoff from the permit area is routed into previously excavated pit areas. While it is unlikely that any water will be discharged from the site, an existing NPDES permit allows Trapper to discharge into the Yampa River if necessary. Reclamation will be completed as described in Exhibit E. FVUjsh 4119 [sgpermit] Revision: T2.— b� Approved: