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Comments on Gigapan: Dan Patch Pegmatite Mine

  2. This is a view of the mine dump of the Dan Patch Pegmatite Mine, just west of Keystone, South Dakota. The light colored pegmatite rock is composed primarily of large crystals of quartz, albite feldspar, and muscovite, with lesser amounts of tourmaline and beryl. The pegmatite is an igneous rock that was intrusive int...

    • 29303-210x140

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GigaPan Comments (1)

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  1. Gary Kindel

    Gary Kindel (July 29, 2009, 11:33AM )

    This was only of my favorite mines I visited while going to SDSM&T back in the early 80s.