Hall, S.M. and Mihalasky, M.J. report that grade and tonnage data for calcrete-type surficial uranium deposits found in 11 different countries were compiled. Fifty-eight deposits with reported grade and tonnage, and thirty-five occurrences for which there is no reported resource are tabulated in separate Excel workbook spreadsheets.
Supplemental Information:
Calcrete-type uranium deposits are a subset of the International Atomic Energy Agency surficial deposit type, and are found in arid environments associated with non-pedogenic calcrete (Toens, 1984). The resource data in this compilation derives from technical reports following international reporting standards, company reports, and published literature referenced for each deposit with details of the reference on a separate sheet (see the database metadata for additional information on data quality). For each deposit, a primary and alternate name, if appropriate, is listed.
Some deposits were aggregated into a larger projects as noted in Mauritania, Argentina, Tanzania and Botswana. USGS disagregated larger projects into individual deposits where possible, and in these cases the larger project name is identified in the alternate name column. The resource category is shown for each deposit as listed in the cited reference. Some resource estimates are historic with limited support data, while others are more robust estimates compatible with either JORC (Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves, 2012) or NI 43-101 standards (Canadian Institute of Mining, 2014). Mineral resources are reported as inferred, indicated and/or measured, listed in order of increasing level of confidence of the estimate. In-place (unmined) and mined material, are combined to determine the total in-place resource as required in undiscovered resource estimates (Singer and Menzie, 2010).
Back-Up Database: http://www.i2mconsultants.com/downloads/corp/CalcreteGradeTonnageData.xlsx
Original URL: https://certmapper.cr.usgs.gov/geoportal/catalog/search/resource/details.page?uuid=%7B6576C89A-448C-4625-83D4-1086AC9D6FDB%7D
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