South Platte Pegmatite District

Past ProducerFeldspar, QuartzUSGS MRDS

Location

StateColorado
CountyJefferson
Coordinates39.39555, -105.21502

Commodities

PrimaryFeldspar, Quartz
SecondaryFluorine-Fluorite, REE, Gemstone
TertiaryThorium, Niobium (Columbium), Tantalum, Manganese

Mine Details

StatusPast Producer
First Production1935
Last Production1965
Data SourceUSGS MRDS
Source ID10107990

What This Means

This mine is a past producer — it was once operational but is no longer actively mining. Past producer sites may still have environmental impacts including disturbed land, tailings piles, and potential water quality effects. Some past producer sites have been reclaimed, while others remain as-is. Check with your state mining or environmental agency for current site conditions.

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