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2019-09-13_PERMIT FILE - M2018051 (11)
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2019-09-13_PERMIT FILE - M2018051 (11)
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Last modified
12/27/2024 1:00:47 PM
Creation date
9/13/2019 11:54:03 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2018051
IBM Index Class Name
Permit File
Doc Date
9/13/2019
Doc Name Note
Attachment 3 - Exhibit D
Doc Name
Adequacy Review Response
From
Black Mountain Sand Weld LLC
To
DRMS
Email Name
PSH
MAC
Media Type
D
Archive
No
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Exhibit D: Mining Plan <br /> Black Mountain Sand Weld LLC(Black Mountain) plans to construct and operate Lost Creek Mine, a 2.4 million <br /> ton per year(Mtpy) industrial proppant sand production facility in Weld County, Colorado. It will consist of an <br /> open pit mining operation, sand wash processing plant and associated loadout facility located on approximately <br /> 1,796 acres of private land. Lost Creek Mine will be accessed using Weld County Road (WCR)91,which runs <br /> north-south along the west side of the project area.The onsite facilities,approximately 45 acres,will include a <br /> wash processing plant,fueling station and ready line, office and maintenance/warehouse buildings, and a <br /> loadout facility. Utilities, including gas,water, and electric,will be brought to the area.The permit boundary <br /> has been offset at least 200 feet from the affected lands boundary,the plant facilities, and WCR 91,ensuring a <br /> buffer area between the active project area and neighboring lands.This buffer area will consist of undisturbed <br /> land covered in natural vegetation. <br /> The Lost Creek Mine will produce industrial proppant sands over approximately a 35-year period.All mined <br /> material will report to the sand wash processing plant for separation and beneficiation. Product will be stored <br /> in silos for loading and transport.The facility will employ approximately 145 personnel in 3 shifts,which include <br /> approximately 65 hourly and/or salaried personnel at the mine and approximately 80 hourly and/or salaried <br /> personnel for the sand wash processing plant. Operations will be conducted using appropriate Best <br /> Management Practices(BMPs)for storm water control,ground water protection, and fugitive dust mitigation. <br /> Mine Plan Requirements <br /> Included below is the mine plan information, as required in Section 6.4.4 of the Colorado Mined Land <br /> Reclamation Act. <br /> 6.4.4(a) Methods of Mining—Exhibit C6.1 and C6.2, Mining Plan Map shows the estimated size and location of <br /> each mining block(1-year mining period)within the 1st 10-year period. Mining of one yearly block at a time is <br /> planned,with concurrent reclamation as practicable. It is estimated each highwall will take approximately 3 <br /> years to regrade and reclaim. To develop a pit,topsoil (approximate average 2'depth over the life-of-mine) <br /> will be stockpiled onsite to be used during reclamation or spread directly as practicable.An initial topsoil <br /> stockpile will be developed adjacent to the affected area perimeters in order to minimize disturbance. It will be <br /> constructed with a slope of 5:1 (H:V)and seeded for erosion control.The proposed seed mix is the Weld <br /> County Sandy Site Mix, as shown in Exhibit E. Runoff will be controlled with BMPs.The conceptual location of <br /> the topsoil stockpile(s) in year 5 are shown on Exhibit C6.1 and C6.2, Mining Plan Map. <br /> After salvaging topsoil,all sand reserves will be excavated and transported to the sand wash processing plant. <br /> During the first several years of the operation, material will be hauled by 40-ton mining trucks to the sand wash <br /> processing plant; in later years the material may be piped to the plant in a slurry in a closed loop system. If a <br /> slurry pipeline is used, a technical amendment of the existing mine permit will be completed prior to beginning <br /> construction on the pipeline. An approximately 250 foot by 200 foot by 20-foot plant feed stockpile containing <br /> material trucked from the mine will be maintained at the sand wash processing plant throughout operations. <br /> The plant feed stockpile will hold approximately 45,000 tons of material and will be constructed so the slopes <br /> match the natural angle of repose for stability. See Figure D3 for location of this plant feed stockpile. Stockpiled <br /> material will be loaded on conveyors to be washed and sorted at the sand wash processing plant. <br /> The sand wash processing plant will separate saleable product from backfill material during processing. Backfill <br /> material (unsuitable for sale based on size requirements)will be stockpiled as needed at the sand wash <br /> processing plant or directly used as pit backfill for site reclamation.The backfill stockpile will not exceed 140- <br /> 1 <br />
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