2025-04-22_REVISION - M1979045 - Laserfiche WebLink

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EXHIBIT D MINING PLAN (cont) History The property known as the Church Pit was originally leased from Marcus Church or Church Ranch (the land and mineral owner at the time) in about 1955 by John Harvey. Mr. Harvey operated the pit until his death in about 1967 . The existing mine access road has been in continuous use since Mr. Harvey opened the mine in 1955 and is not made part of this amendment as it is a pre- existing road. In 1968, The Lakewood Brick & Tile Company signed a lease agreement with Mr. Church covering the old pit and the area between the pit and the Rocky Flats Plant west entrance road. Lakewood Brick has operated this open pit area continuously (except for seasonal shutdowns) since 1968 . In late 1974, Mr. Church sold the property to the United States of America, Atomic Energy Commission (AEC) , later renamed the Department of Energy. Mr. Church retained the mineral rights, the right to mine the minerals, and to use the surface for processing and other mining related uses . In 1978, Mr. Church and Lakewood Brick signed another lease which covered additional lands north of the old excavation. Mining by previous operators prior to the 1976 Mined Land Reclamation Act left some large waste piles and a pit with nearly vertical sides in the south-central part of the lease area. Since the last amendment those piles have largely been removed and the old excavation has been partially backfilled on the very south end. The McKay and Upper Church ditches historically meandered across the Church Pit and the Rocky Flats Pit in a general southwest to northeast direction. The ditches have been relocated and now run along the west boundary of the Church Pit, then turn east along the north edge of the Church Pit, then along the north edge of the Rocky Flats Pit, then return to their historical channels to the northeast of the Rocky Flats Pit. Once the old ditches are abandoned and their rights-of-way vacated, mining may commence in the old ditch locations . Blasting has taken place throughout the life of the clay operation. There are intrusions of sandstone between the clay seams and a cap rock cover on the south end that had to be removed to get to the clay. Blasting is done using an explosives contractor and occurs one to five times per year as needed. This may increase when sandstone mining begins . Geologic Setting The clay being mined at the Church Pit is from the basal members of the Laramie formation of Upper Cretaceous age. These Lakewood Brick and Tile CO Church Pit- M-1979-045 Amendment 02 April 16, 2025 8