Ree pdf reader download

The report also includes an overview of known global REE resources and discusses the reliability of alternative foreign sources of REE. PDF Part or all of this report is presented in Portable Document Format PDF ; the latest version of Adobe Reader or similar software is required to view it.

Download the latest version of Adobe Reader, free of charge. Long, K. Geological Survey Scientific Investigations Report —, 96 p. Department of the Interior U.

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New mine production began at Mount Weld in Western Australia, and numerous other exploration and development projects noted in this chapter are ongoing throughout the world.

The REE-bearing minerals are diverse and often complex in composition. The REEs also have a strong genetic association with alkaline magmatism.

The systematic geologic and chemical processes that explain these observations are not well understood. Economic or potentially economic REE deposits have been found in a carbonatites, b peralkaline igneous systems, c magmatic magnetite-hematite bodies, d iron oxide-copper-gold IOCG deposits, e xenotime-monazite accumulations in mafic gneiss, f ion-absorption clay deposits, and g monazite-xenotime-bearing placer deposits.

Monazite-bearing placer deposits were important sources of REEs before the mids and may be again in the future.

Alkaline igneous complexes have recently been targeted for exploration because of their enrichments in the heavy REEs. Information relevant to the environmental aspects of REE mining is limited.

Little is known about the aquatic toxicity of REEs. The concentrations of REEs in environmental media are influenced by their low abundances in crustal rocks and their limited solubility in most groundwaters and surface waters. The scarcity of sulfide minerals, including pyrite, minimizes or eliminates concerns about acid-mine drainage for carbonatite-hosted deposits and alkaline-intrusion-related REE deposits.

For now, insights into environmental responses of REE mine wastes must rely on predictive models.