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V~~.~ \Y <br />r • <br />4' <br />O <br />O <br />lAl <br /> <br />,9 <br />rV^/ <br />V/ <br />/O^~ <br />~l <br />~~ <br />M~ <br />,l-^, • <br />V/ <br /> <br />Figure 2. A historic cross-section of the Schwartzwalder Mine showing the early <br />progression of development. Adapted from Soule, 1960. <br />