South Platte Pegmatite District, Jefferson Co., Colorado, USA

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References

Simmons and Heinrich (1980) "Rare-Earth Pegmatites of the South Platte District, Colorado" Colo. Geol. Surv. Resource Series 11.

Simmons, W.B., Lee, M.T., and Brewster, R.H. (1987) Geochemistry and evolution of the South Platte granite-pegmatite system, Jefferson County, Colorado. Geochimica et Cosmochimica Acta: 51: 455-471.

Gagnon, J.E., Samson, I.M., Fryer, B.J., and Williams-Jones, A.E. (2004) The composition and origin of hydrothermal fluids in a NYF-type granitic pegmatite, South Platte District, Colorado: evidence from LA-ICP-MS analysis of fluorite- and quartz-hosted fluid inclusions. Canadian Mineralogist: 42: 1331-1355.

Hanson, S.L. Simmons, Wm.B and Falster A.U. (2004) Samarskite-(Yb): A New Mineral Indicating Extreme HREE Enrichment in the South Platte NYF Pegmatite District, Colorado. GSA Abstracts with Programs. v. 36, No. 5, p. 115.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Albite var: Cleavelandite 'Allanite' Allanite-(Ce) Anatase ? Anhydrite 'Apatite' Autunite Baryte 'Bastnäsite' Bertrandite ? Beryl Biotite Calcite Cerite-(Ce) ? Columbite Cryolite Dawsonite Euxenite-(Y)

'Feldspar Group' 'Fergusonite' Fergusonite-(Y) 'Fluocerite' Fluocerite-(Ce) Fluorite var: Yttrocerite var: Yttrofluorite 'Gadolinite' Gadolinite-(Ce) Gadolinite-(Y) Hematite var: Specularite Ishikawaite Kaolinite Kasolite 'K Feldspar' Limonite 'Mica Group'

Microcline var: Amazonite Microlite Group Molybdenite 'Monazite' Monazite-(Ce) Muscovite var: Sericite 'Perthite' 'Prochlorite' Pyrite Pyrolusite Quartz var: Amethyst var: Citrine var: Milky Quartz var: Rose Quartz var: Smoky Quartz Rowlandite-(Y) ?

Samarskite-(Y) Samarskite-(Yb) (TL) Sellaite Siderite Synchysite-(Y) Thalénite-(Y) Thorite Thorogummite Topaz Torbernite Uraninite Uranpyrochlore Xenotime-(Y) Yttrotantalite-(Y) Zircon var: Cyrtolite

82 entries listed. 45 valid minerals. 1 type locality (valid mineral).

Localities in this Region

USA Colorado Jefferson Co. South Platte Pegmatite District Bear Creek Big Bear No. 2 pegmatite (Big Bear pegmatite; Little Bear pegmatite; Big Bear No. 1 pegmatite) Big Bertha Mine (Big Bertha pegmatite) Buffalo Creek Butte No. 1 (Daisey Belle) Butterfield pegmatites Catherine No. 1 Mine Cyrtolite-bearing Pegmatite Deposit (MRDS - 10191580) Dazie Bell claim Deer Trail pegmatite Delbert Claims No. 1 & 2 Gemini pegmatite Hidden Valley mine Hollingsworth pegmatite Janet Lutricia pegmatite Judy Ann Mine Last Dollar pegmatite Lesser White Cloud pegmatite Little Bill pegmatite Little Patsy pegmatite (Patsy pegmatite) Luster No. 1 pegmatite (Lester pegmatite; Oregon No. 3 pegmatite; Ytrrium No. 1 pegmatite) Luster No. 2 pegmatite Madonna No. 1 pegmatite (Madonna Eastern pegmatite) Madonna No. 2 pegmatite (Deep Hole pegmatite)

USA Colorado Jefferson Co. South Platte Pegmatite District Madonna No. 3 pegmatite (Madonna Western pegmatite) Mickey No. 1 Occurrence Mugford pegmatite Old Luster lode Oregon No. 1 pegmatite (Raleigh Peak No. 2 and 2a pegmatite) Oregon No. 1½ pegmatite (Raleigh Peak Big Bear pegmatite) Oregon No. 2 pegmatite (Raleigh Peak No. 3 pegmatite) Oregon No. 2½ pegmatite (Raleigh Peak No. 4 pegmatite; Big Dick pegmatite) Oregon No. 3 Mine (Quartz Knob; White Cap-Raleigh Peak group) Raleigh Park Mine Ramona pegmatite (Elizabeth pegmatite) Seerie pegmatite (Cooper pegmatite) Shuttle Run pegmatite Susy Belle Occurrence Twin Cedars pegmatite Unknown Granite (MRDS - 10016587) Unknown Granite (MRDS - 10108126) Unknown Quartz - Feldspar - Mica Occurrence (MRDS - 10016599) Unnamed pegmatite Vermillion Ranch prospect White Cap pegmatite White Cloud pegmatite White Eagle pegmatites Yammy Yogurt claim