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GBEA Wagner Pit#M2023038,Owner&Operator:Twin Buttes Land Co LLC 04/10/2024,Page 26 of 65 <br /> Mining Plan, Exhibit C <br /> This section will describe the mining. Much of this section flows from the legacy of over <br /> 60 years of mining. Management options are truncated due to the legacy. <br /> Operational Time Frame (a) <br /> The Wagner Pit has been in operation for a minimum of 60 years. Since the Twin Buttes <br /> Land Co LLC (Twin Buttes) has owned the property, the pit has been operated <br /> intermittently. The mined product has been used to support management of an <br /> agricultural/ranching operation on Twin Buttes property. In general, the usage falls into <br /> road maintenance and construction, waterway and irrigation ditch stabilization, general <br /> fill, and other uses in the course of ranching, farming, and land management. Product <br /> demand is intermittent, thus the mining is intermittent. At least once a year product <br /> will be removed from the pit. <br /> The pit will operate from June 2024 until the supply of material is exhausted, or Twin <br /> Buttes no longer needs the product. The planning horizon is potentially decades, a <br /> lifetime. Hence, a date of 2075 is suggested with a planning and management horizon <br /> of over 50 years. <br /> Soil Salvage and Stabilization (b) <br /> Given the long history of mining, much of the site no longer has the historical soil <br /> profile. The north slope portion of the pit currently supports a sagebrush community, <br /> and the "top" soil, horizons H1 and H2, are 4-16 inches in depth (see Blazon soil <br /> description in Exhibit B). These horizons are described as a loam or clay loam. Cobbles <br /> are mixed with the soil. The top soil is highly variable in depth as can be seen in Photo <br /> C-1 below. <br /> • <br /> Wagner Pit �w, i 1�;100 <br /> 7 } <br /> North Slope` {t ,;r4 a` <br /> Soil Horizon •"‘-• ' 6), <br /> 4 inches+ . } e. bt . t ., <br /> reb 12,2024 ! " l <br /> GBEA <br /> . w <br /> ltlk'. ar A .alT�' <br /> '` { ` _♦ • :' <br /> 46 <br /> Photo C-1. The north slope top soils horizons are variable in depth and contain large cobble. <br /> A reasonable estimate is 8 inches of soil depth as salvageable on the north slope, with <br /> more possible in some areas. Caution should be used in soil salvage due to the depth <br /> being highly variable. The south facing slope and top of the pit has been heavily mined, <br /> with top soil scarce and little vegetation growing. <br />