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affected area.A sediment basin will be maintained for storm water runoff.Stormwater will not be <br /> retained for more than 72 hours in this basin before it is released. <br /> Along the north side marked as"Alley",a setback of 70 feet from the Permit Boundary will be <br /> maintained. All areas will have a minimum of 25 feet. The setback area will be reclaimed if disturbed. <br /> Mining Timetable <br /> We estimate that by adding the new area,the life of the mine will be extended between 50 to 99 years. <br /> The continuing uncertainty of economic conditions in the construction materials industry precludes an <br /> accurate forecast of demand for materials during the life of the mine. We,therefore,can only estimate <br /> the mining timetable based on an average year and may expect a specific year to vary widely from the <br /> average. The usage has varied from 3,000 tons to 10,000 tons in a year. Using an average of 8,000 tons <br /> per year,a 70%recovery rate,and an average thickness of 10 feet,the annual surface disturbance <br /> would equal approximately 0.33 acres per year.There is an additional 20 mineable acres so there would <br /> be approximately 57 years of reserves. <br /> Summit Brick&Tile Company - Native/Pierre Mine 124/10 2020 <br />