URANINITE - 3250 Level Sunshine Mine, Coure d'Alene, Idaho - Collected in 1951

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This is an extremely rare specimen of Uraninite from the deep levels of the Sunshine Mine, 3250 Level (3,250 feet below the surface and 750 feet below sea level, accessed by the Jewel Shaft), Coeur d'Alene, Idaho. These levels are now back-filled and inaccessible. It was collected by mine geologist Ray Robinson in 1951 (Ray is now 101 years old). A paper on this occurrence was published by Paul Kerr and Ray Robinson in 1953 - "Uranium Mineralization in the Sunshine Mine, Idaho" in Transactions of the AIME, May 1953, Mining Engineering, p. 495-511. This mineralization was dated in 1951 as 750 +/- 50 million years old.The slab is labeled on one side "UK 118" black india ink on white paint. It is part of the slabbed specimen shown in Figures 20a and 20b in the 1951 publication. The location the specimen was collected from is the 25 East Stope, 40 feet below 3250 Level and is indicated by the red circle, centered on the 3100 Level, on the mine workings cross-section image. Temperature of formation ranges from 550-620 Centigrade.Excellent display specimen of massive black Uraninite margins along the contact between dark brown Siderite vein cross-cutting pinkish brown "red" quartzite. Nice clean slabbed specimen. The vein itself has been lacquered, you can see this in the second picture. The slabbing process was not the best but the specimen read more

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