Dan Patch Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
Brown phosphoferrite crystals to 2 mm in ludlamite. P. Cristofono specimen and photo.
© 2008 Peter Cristofono
A dark olive green mass. JSS specimen and photo.
© 2014 JSS
Size: 9,5 x 4 cm Collection and photo: Arliguie M
© Arliguie M
7 mm apatite prism in a quartz-lined vug.
© Stephen E. Fritz
Light purple hexagonal-prismatic crystals with flat, white terminations in Albite matrix. SDSM&T Museum of Geology specimen #5095.
© Tom Loomis
Triphyllite (superficially weathered almost black) in dendritic intergrowth with white microcline. Lens cap is 5 cm for scale. Scanned from a 35mm slide.
© 2017 E. L. Clopton
Goethite pseudomorph after siderite, identification was confirmed by Bill Roberts (Senior Curator of Mineralogy and Invertebrate Paleontology) at SDSM&T in 1985). Goethite pseudomorph after siderite: Dark Brown: Albite: Whitish translucent crystals.
© 2020 Gary L Kindel
1 cm in length fluorapatite crystal on albite (var cleavelandite) Identification was confirmed by Bill Roberts (Senior Curator of Mineralogy and Invertebrate Paleontology) at SDSM&T in 1983).
Stacked from 6 images. Method=B (R=8,S=4) Identification was confirmed by Bill Roberts (Senior Curator of Mineralogy and Invertebrate Paleontology) at SDSM&T in 1985). Fluorapatite crystals on albite encrusted muscovite.
Blue Fluorapatite from the Dan Patch Mine. Ex Kay Robertson collection.
Looking across the glory hole at the Dan Patch mine from 6-8 above the water elevation.
© 2022 Gary L Kindel
View of the mine from above the highwall, seeing the entire glory hole. Highwall is about 80 feet above the water in the pit.
This photo shows the upper portion of the granitic pegmatite intrusion into Precambrian aged metamorphic schist country rock.