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' Operations are expected to last 15 to 20 years. The size and <br /> location of each phase is shown on the Mining Flan Map. <br /> Maximum depth of mining will be approximately 20 feet. The <br /> ' stratum immediately beneath the material to be mined is the upper <br /> unit pierre shale. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> t <br /> t <br /> 1 <br /> D-2 <br /> 1 <br />