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up steeper than 3:1 when reduction can be completed with cut and fill. This also preserves sufficient <br /> growth medium for reclaiming the nearby pit bottom thereby integrating the reclamation of the toe of <br /> the 3:1 slope with the bottom into a gentle curve rather than an abrupt change in slope that encourages <br /> the initiation of headward erosion of the toe of the slope. For more details on this refer to the <br /> Reclamation Plan. This is one of those subjects that straddles mining and reclamation processes. <br /> There is an additional powerline that extends from the eastern boundary of the property <br /> directly westward across the operation. To continue mining southward into the amended land this <br /> powerline will need to be moved. <br /> This powerline belongs to Schmidt and feeds part of the electrical needs of the processing <br /> plant. (Power to the office is fed by a separate line from the south-southwest.)A new line will be <br /> constructed from the east side of the property over to the wash plant and screening plant. Then the <br /> current line will be taken down prior to proceeding with stripping and mining to the south. Thus the <br /> new line will be located well north of any future mining. This is expected to happen in the next year, <br /> but exact plans are not in place yet. The new powerline will not interfere with any future mining or <br /> reclamation operations. As the plant moves south new power poles will be installed so the line can be <br /> extended as the plant moves southward. Once completed the new route of this powerline will be noted <br /> on the next annual report map. <br /> Maximum Amount of Highwall at Any One Time <br /> For mining purposes the amount of highwall exposed at any one time is not very important. <br /> However,because essentially all land affected by the operation is required to be reclaimed to a <br /> subsequent beneficial use, this number becomes important because the reclamation plan must be <br /> bonded with a financial warranty. The soil/overburden top layer averages about 8 - 9 feet deep and the <br /> depth of mining the gravel layer beneath that layer has a nominal depth of around 35 to 40 feet, a good <br /> estimate is that the entire depth is about 44 to 49 feet high. It can be higher and it can be lower,but <br /> that is probably a good average. <br /> There are three connected highwalls to be concerned about. The longest stretches across the <br /> operation along an east-west line. Attached to each end of this wall are the two sides of the pit with <br /> highwalls that run northward along a north-south line. The side highwalls are usually quite straight, <br /> but can be stepped if there is a road on top of the gravel but at the base of the overburden highwall <br /> which is usually vertical or nearly so. Stepping is also often the case with the east-west highwall, so <br /> the highwall is rarely vertical from the bottom of the pit to the top of the soil. These steps are <br /> transportation corridors as well as used to extend the overburden stripping further. It is far easier to <br /> Fountain Pit Technical Revision#3 - June 2022 M-1982-155 Mining Plan Page 20 of 22 <br />