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Gem resources
Deposits of rare minerals prized for their color, durability, sparkle, and clarity when cut and polished and used as ornaments or jewelry.
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Natural gemstones [More info]
Online booklet on natural gemstones, terminology, geologic environment, birthstones, U.S. production, chemical formulas, and references.
Western Region Mineral Resources Project listing [More info]
Links to ongoing mineral resources projects in the Western Region of the United States plus links to offices and staff of the Western Mineral Resources Team.
PDF A methodology for conducting national-scale alluvial diamond resource potential and production capacity assessments, with a focus on artisanal mining [More info]
Geologic evidence, combined with geographical data and analyized through a geographic information system allows us to compare production statistics with likely resource estimates.
PDF Summary of the diamond resource potential and production capacity assessment of Guinea [More info]
Describes organizational process and field study used to estimate production capacity (mostly by artisanal miners) in the parts of the country likely to contain diamonds. We estimate a production capacity of 600,000 carats per year.
PDF Summary of the reconnaissance investigation of the diamond resource potential and production capacity of Côte d'Ivoire [More info]
Study integrating archival reports and maps, satellite imagery, and terrain modeling to estimate resource reserves of 11,200,000 carats in two regions of the country.
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