[en] More information and misinformation are available about the resources of uranium than of any other mineral commodity, save petroleum, and perhaps also gold. Governments of major uranium producing countries regularly publish estimates of their national resources and reserves of uranium, albeit on varying definitions. These national data are collated in the periodic joint Organization for Economic Co-operation and Development (OECD)/International Atomic Energy Agency (IAEA) reports known as the Red Books. Whilst the figures are set out in apparently common format, the reports clearly indicate the differences between coverage of the various national definitions, and the criteria they use. It is emphasized that 'grey zones in correlation are unavoidable, particularly as the resources become less assured. This paper examines some of the background to the Red Book data which has a bearing on their interpretation. (author)

[en] Short communication. 1 fig

[en] As one of the results of the world energy conference 1986 among others the expected shortage of natural uranium resp. compared to it the expected shortages of other energy sources were published. The impression arose that a forced breeder use would have no important influence on the consumption of natural uranium and that between 2010 and 2040 in any case all known and additional stocks of natural uranium of about 7 million tons would be used. These statements give also the impression that nuclear energy represents no lasting or long-term energy source compared to coal, oil and natural gas. This interpretation should now be corrected. It can be stated that by rational and correct planning of a breeder strategy with a closed fuel cycle nuclear energy can be used for hundreds up to thousands years. The limits are given by the capital use and the so-called plutonium dynamics, the upper limit of which is described in the following. 2 refs., 3 figs

[en] In this paper are reviewed: the uranium geologic distribution. World uranium resources and production, especially in France, and type of uranium deposits of industrial interest

[en] The project area of Lagoa Real is located in west-central Bahia. The ground is owned by numerous local landowners, the right to prospect for and to mine uranium rests exclusively with Nuclebras. Some preliminary testwork has indicated that no serious milling problems are likely to occur. Satisfactory uranium leaching extraction rates of above 90% have been achieved with an acid consumption of 50 - 70 kg H sub(2) SO sub(4)/t of ore. The following in situ geological reserves are presently estimated by Nuclebras at a cut off grade of 100 ppm: Nuclebras / US Category: measured indicated 7,150 t U sub(3)O sub(8) indicated inferred 11,110 t U sub(3) O sub(8) inferred potential 30,000 t U sub(3) O sub(8). (author)

[en] Uranium exploration in Romania started in 1950 and in 1951 a high grade tabular sandstone deposit in Permian sediments had been discovered in the Apusani mountains of the West Carpathians. Subsequent work lead to the discovery of additional deposits in this area and established a uranium province in the Western Carpathians. Further uranium provinces were outlined in the Banat mountains as well as in the Eastern Carpathians. The Reasonably Assured Resources of Romania, unassigned to any cost category are estimated at 18,000 tonnes U. The current uranium production is about 200,000 tonnes of ore mined by underground methods. The production centres are located in the three uranium provinces. Due to the unfavorable geological conditions the uranium production costs are considered high. (author). 1 map

[en] The classification method for mineralization continuity is proposed, which divides uranium deposits into nine types of exploration in accordance with proportion of reserves in large ore bodies

[en] Some works made by ASAV.PM (Evaluation Commission for Mineral Resources, NUCLEBRAS) with computer resources and ACRE910 program, including geological interpretation of AN-03, AN-06 and AN-13 anomaly from Lagoa Real Design (Brazilian Uranium Basin), aiming discuss the space position of uranium mineralized bodies and put at disposal the computer facilities for the users are presented. (author)

[en] In the April 1994 issue, Nuclear Engineering International published a British Nuclear Fuels (BNFL) commentary on a study conducted by the Nuclear Control Institute (NCI) which proposed that Japan forego reprocessing and acquire a strategic reserve of low-enriched uranium (Should Japan reprocess or build a strategic U reserve? - pp28-29). In June, BNFL issued a slightly revised version of its commentary to address the final version of NCI's Japanese Strategic Uranium Reserve (JSUR) study, released in January. NCI here responds to what it identifies as ''BNFL's claims''. (author)

[en] This brief preface introduces a special section devoted to Cigar Lake. Discovered by Cogema, the deposit has estimated reserves of 154 600 tonnes of uranium with an average grade of 7.9%. The other eight articles in this section have been abstracted separately