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<p>for extracting silver from ore. The mines declined after 1874, although underground mining continued sporadically into the 1920s.</p>

<p><big>Geology</big></p>
<p>Volcanic vents to the east covered the area during the <a href="page.php?w=Tertiary_period">Tertiary</a>, and a <a href="page.php?w=fault_%28geology%29">fault fissure</a> opened the east slope of the <a href="page.php?w=Virginia_Range">Virginia Range</a>.  The east slope of the range forms the <a href="page.php?w=Fault_%28geology%29">footwall</a> of the Lode, and is composed of <a href="page.php?w=diorite">diorite</a>,</p><p>
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