2023-10-03_REVISION - M1993004 - Laserfiche WebLink

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0010 General Shale Building The American Dream® RECEIVED September 19, 2023 OCT 0 3 2023 Colorado Division of Reclamation, Mining, and Safety Colorado Division of Reclamation, Mr. Joel Renfro Mining and Safety Environmental Protection Specialist 1313 Sherman Street, Room 215 Denver, CO 80203 Re: M-1993-004 Navajo Mine, Elbert County, Colorado Technical Revision Dear Mr. Renfro: General Shale Brick, Inc. (GSB) is in receipt of the inspection report for the Navajo Mine dated May 3, 2023. The inspection report cites 3 problems: Problem 1 General Compliance With Mine Plan The current mining plan needs to be updated and clarified pursuant to C.R.S. 34-32.5-112(1)(c)(VI) and Rule 6.4.4. The operator must provide sufficient information to describe or identify how the operator intends to conduct the operation. Specifically, the mining plan reeds to be updated to describe the stormwater management plan for the site, including all water diversions and impoundments. This revision must also include an updated mining plan map that meets the requirements of Rules 6.2.1(2) and 6.4.3. All stormwater management structures must be shown on the updated map. Exhibit D Mining Plan Changes (a) :lining :'athods TR-1 changed the mining direction. Add water trucks, motor graders, excavators, and trucks to the list of mining equipment. (b) Eaii 111V ii11y Add water trucks, motor graders, excavators, and trucks to the list of mining equipment. (c) Water Diversions and Impoundments The pit intersected groundwater and more inFon—nation is found in Exhibit G 11-'✓ater Information. Per paragraph a of the groundwater permit General Shale is required prevent surface water from entering the pit using berms or other barriers. General Shale has installed a perimeter berm and ditch around the crest of the highvvall to prevent surface water from entering the pit and to divert stormwater flows around the pit. Where grades are steep enough to cause erosion and head cuts, check dams will be installed to minimize erosion. This configuration will follow the life of the mane as manar,g progresses east. The clay stockpile pad area has been graded to flow to the south and west with berms along the perimeter of the clay stockpile pad area to direct stormwater flows. A stormwater erosion livestock pond was bui►t to capture stormwater flows fro►►► the clay stockpile pau area. in 2023 the Division of Water Resources approved clay stockpile pad area stormwater pond as a livestock and erosion pond. (d)a is size of ar ea(s) to u -worked at any one time. No Change (e) An approximate timetable to describe the mining operation.