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Riverside Aggregates, LLC <br /> Mayhew Pit <br /> File No. M-2024-054 <br /> EXHIBIT D —MINING PLAN <br /> The Mayhew Pit will be a regular 112 Operation in Bent County. <br /> The main entrance to the site will be from Bent County Road JJ at the northwest corner of the <br /> site the coordinates being: <br /> 38° 05' 59.00" N <br /> 102° 48' 53"00 W <br /> (a) The mining will be done with front end loaders and excavators. <br /> (b) Earthmoving will all be done with scrapers and front-end loaders. All equipment will be <br /> portable. <br /> (c) No groundwater is expected to be encountered during excavation and mining; therefore, no <br /> impact to the hydrologic balance is anticipated. <br /> (d) Mining will occur in 20-acre phases. <br /> (e) While excavating, a highwall will be created. The wall will be approximately 10' high at a <br /> 1:1 slope and potentially deeper to extract the material. The highwall will be approximately <br /> 1000' in length along the north side boundary of the pit. Deeper cuts shall be backfilled to <br /> permit depths within 30 days of excavation. <br /> The target gravel source is located beneath limited topsoil of 0-6 inches and overburden of <br /> an additional 1-3 feet.Aggregate material is anticipated to be an additional 10 feet in depth. <br /> Topsoil and overburden will be saved for reclamation of the mine site. <br /> The life of the proposed operation is difficult to quantify due to the changing economic <br /> conditions in the construction industry and aggregate quality.At this rate, the life of themine <br /> would be approximately 10-15 years depending on local economic conditions. <br /> Mining will proceed in a northern direction. Extracted material will be moved to the processing <br /> area that is anticipated to be in the central portion of the pit.Aggregate will be processed <br /> using a portable crusher and screen. Mining will occur in 20-acre phases. Reclamation <br /> will occur concurrently to mining and as one 20-acre phase is completed, a second phase <br /> will open. <br /> Water for dust suppression will be hauled to mine site if necessary. <br /> There will be no storage of fuel or lubricants onsite. Fuel will be hauled onsite as needed by <br /> vendor trucks. <br /> This is a privately owned site and does not require the State Historic Preservation Office <br /> requirements for a cultural or historic study. If the operator encounters any structure of note, <br /> the State Historic Preservation Office will be notified. <br />