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FIG. 11. Electron microprobe and X-ray microprobe analyses of copper and uranium in deeper North Process Pond (NPP) sediments. Disseminated copper and uranium, along with uranium-rich solids are present at a depth of 1.2 m (4 ft), but neither is detectible at a depth of 4.9 (16 ft) in Sample NPP 1-16, included for reference, even using the X-ray microprobe. Sample NPP 2-4 includes a backscattered electron image and electron microprobe elemental abundance maps, overlain by X-ray microprobe abundance maps. The red arrows indicate occurrence of uranium-rich mineralization; the green arrow indicates an area of disseminated copper and uranium.
