Mineral Point, Wisconsin his family who settled a few miles away from Mineral Point. During the following year, large quantities of galena, or lead ore, were discovered around the settlement in shallow deposits. Lead had many uses at the time, and settlers began to flock to the region hoping to make a living by extracting the easily accessible mineral. Lead deposits extended throughout an area that also included Dubuque, Iowa and Galena, Illinois, but Mineral Point became the center of lead mining operations within the bounds of present-day Wisconsin (then part of Michigan Territory). By 1829, the region's growing population led to the
Primary minerals as basalt, rhyolite, andesite and obsidian) and intrusive rocks (such as granite, granodiorite, gabbro and peridotite) contain primary minerals including quartz, feldspar, plagioclase, muscovite, biotite, amphibole, pyroxene and olivine in varying concentrations. For the classical discussions of the origin of primary ores, see the two publications "Ore Deposits" (1903 and 1913). According to W.A. Tarr (1938) the primary mineral deposits are the result of direct magmatic action; he states that the splitting of magmas results in the basic igneous rocks and their accompanying group of accessory minerals formed by the first crystallization in the magma, on the one hand, and