Uraninite — Central City Mining District, Gilpin County, Colorado, USA

Please note: This item is an export restricted specimen and requires authorization from the CNSC to export outside of Canada. International customers please see the U & Th Mineral Ordering section link at the bottom of the main page for more information.

This uraninite specimen comes from the Central City Mining District of Gilpin County, Colorado—one of the region’s classic uranium-bearing mining areas with a long history of producing well-crystallized primary uranium oxide. Rich, dense, and typically massive with a jet-black metallic sheen, this piece displays the characteristic heft and powerful radiometric response expected of high-grade uraninite.

Material from Central City is increasingly uncommon on the market, particularly in well-preserved form, as most historic workings have long been closed or reclaimed. This specimen is an excellent acquisition for collectors focused on uranium minerals, Colorado mining history, or systematic heavy-element mineralogy. It’s a standout reference piece that clearly demonstrates the defining properties of uraninite from one of Colorado’s most important historic districts.

ex. Jack Neiburger Collection

Approx. specimen size: 55mm x 25mm x 25mm

Approx. specimen weight: 52.15 grams

Approx. specimen activity on an SE International Ranger EXP: 30 000 CPM