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EXHIBIT D-Mining Plan The existing operation has harvested surface rock from the talus slope under a valid 110 permit since 1999. The 110 permit was converted into regular 112 permit in 2009. A Minerals Materials Permit application has been submitted to and approved by the USFS to expand the harvesting operation onto 23.33 acres of USFS land from the former 110 permit area on the Marble Airfield LLC property. An Environmental Assessment (EA)has been completed and a Record of Decision (ROD) of a Finding of No Significant Impact (FONSI) issued on July 17, 2009. The ROD was noticed. Two appeals were received. The USFS reviewed the appeal and upheld the District Ranger's decision for a FONSI and to issue a Minerals Materials Permit on October 13, 2009. Copies of the ROD, appeals and the USFS correspondence are on file with Colorado Division of Reclamation, Mining and Safety(DRMS). The existing harvesting area is in the southeast corner of corner of Section 21 on United States Forest Service (USFS) land. Historically harvesting occurred from late May to September with contemporaneous reclamation being done in the Fall. The annual harvested volume has ranged from 0 to 1,244 tons. The USFS Record of Decision for the Environmental Assessment specified harvesting start date of June 21 st and an end date of October 31 st which provides 92 days for harvesting. The June harvesting start date was specified due to elk calving concerns. Harvesting occurs intermittently and is less than 180 days. The estimated annual tonnage will vary with market demand and is expected to range from 0 to 1,244 tons. Historically, 23-95 truckloads have been removed during the harvesting season. The truck loads per day ranges from 0.25 to 103. The harvesting operation begins with an excavator creating wind rows of material in the designated harvesting area. Surface rock is harvested by manual methods from the wind rows and placed on pallets. A bobcat moves the loaded pallets to the staging area where the rock is fastened onto the pallet with chicken wire for shipment. No waste rock removal is required since the rock to be harvested is on the surface of the slope. If market demand is high, the excavator may return to create additional wind rows. When an area is completely harvested, the excavator will rough grade the slope in the Fall. The estimated thickness of the talus slopes based on visual observation is 1 to 20 feet. The access gate is approximately 2.18 miles west of Marble, Colorado off Gunnison County Road 3. Access to the permit area is via both an existing dirt road and a new road to be constructed in 2019. No improvements are needed to the existing access road from County Road 3 to the staging area. The existing access road width is 10 feet to12 feet. Approximately 2,250 feet of new access road will be constructed from the existing Darien access road to the current harvesting area on the United States Forest Service (USFS) land. The design width is 12 feet. Roads will be constructed using native materials. The grades are shown on Figure 1 which is included in Exhibit A. The new access road length on the Darien Property is approximately 1,300 feet and may require one culvert. No culverts are required for the access road on the USFS land. The proposed staging area is located approximately 225 feet upgradient from the start on the new access road on the Darien property. This area is used to store pallets for shipment and to load a 15-ton flatbed truck which then hauls the stone to another location for Revised: 09/18/2018 5