Mineral Resources

Includes natural occurrences of any useful inorganic element or compound with particle sizes other than sand, including clay, silt, gravel, and bedrock (that is, substrate with a grain size other than 0.0625-2.0 millimeters; for finer subdivisions, see Federal Geographic Data Committee, 2012 [CMECS]). Distributions are recorded observations or models of mineral grain size, composition, and deposit thickness in a location or area, including maps of these resources derived through observations, interpreted data, remote sensing data, geologic maps, and hydrodynamic models. Assessments are evaluations of total mineral availability; models of present deposition, resuspension, erosion, or accretion; models of difficulty of extraction or relocation; and models of ecological and economic values. Predictions are the results of models or projections of future distributions, values, or ecological impacts of mineral resources; these data include predicted changes due to natural and human forces. Predictions are also the results of scenario-based models of resource losses, gains, or impacts on ecological or economic values under different management strategies (for example, mining, extraction, or relocation) or other human alterations.

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Mineralogy, rare earth elements, and strontium isotopic composition of phosphorites and phosphatized rocks from the Rio Grande Rise, south Atlantic Ocean

Phosphorites and phosphatized rocks from the summit of the Rio Grande Rise (RGR) in the south Atlantic Ocean were collected via dredge during the oceanographic research cruise RGR1 to the western RGR. The location (latitude, longitude, depth), mineralogy, concentrations of phosphorus and rare earth elements, and 87Sr/86Sr ratios of phosphorites and phosphatized FeMn crusts, ironstones, and carbonates from 10 dredge sites are presented here. These data were used to determine the presence of carbonate ...