[en] In view of the problems often encountered at various stage of the resource evaluation on metallogenic belt scale, this paper presents many kinds of disposal approaches and discusses difficulties confronted with when the ore deposit model method is used for the resource evaluation of metallogenic belt. Finally, the author makes a suggestion for the adoption of the ore deposit genetic model or metallogenic conceptual model when the non-aggregative resource evaluation of the metallogenic belt is conducted

[en] Fluctuation of exploration intensity which is a front end of uranium supply normally depends on the amount of uranium requirement for nuclear power plants, nuclear weapons, nuclear facilities, and inventories. The balance of both sides, supply and demand, will produce automatically in the uranium market the real price. The market stocks and inventories are predicted to get smaller and smaller by the year 2010 in line with the increase of nuclear energy demand assumedly from 334 GWE in 1993 to 446 GWe in the year 2010. During that period the requirement is estimated cumulatively about 1,185,000 tonnes of uranium. Since the production capability of western countries is only 576,300 tonnes, the deficit 609,000 tonnes consisted of 22,500 tonnes in 1993 and 27,300 tonnes in the year 2000 and > 50,000 tonnes in 2010 is still expected to be supplied by Eastern European and Asian countries. Even if the new economical deposits will have been discovered after 2005, they will not be able to increase easily the world production because of the low production capability of existing mines, the difficulties for reopening the close mines the low exploration activity, and the length of time for opening new uranium mine. The uncertainty gives a worse impact to the priority on uranium exploration activity in Indonesia where 25% of land territory or about 535,000 km² is presumed geologically favorable for uranium occurrences and resources. BATAN, the Atomic Energy Agency of Indonesia, has been exploring about 407,000 km² or 76% of the whole favorable areas, and discovered uranium indications and anomalies. The most important anomalies that have been being developed are deposits in Kalan area, West Kalimantan. According to roughly calculation compared to present market value, the are not economically mineable. The remaining 128,000 km² areas are mostly located in Irian Jaya, easternpart of Indonesia, where the accessibility is difficult and needs a long time for exploration using consevative method. The use of airborne survey method will be more convenient, effective, and rapid, but more expensive. (author). 1 tab. 8 figs

[en] Geostatistical methods are used for uranium reserve estimation during geological survey, mining and production software is developed for processing a great number of data

[en] Nuclear energy resources as parts of natural energy resources were one of the ecosystem's components which needed to be studied for their present and usage. In order to anticipate nuclear energy development in many need, it is important to have balance analysis to manage its supply and usage. In the other hand, exploration and exploitation of nature always gave negative impact to the ecosystem. This condition would had been the damaging external factor. To lessen this situation, the determination of economic values of nuclear energy resources specifically and natural energy resources generally, should have been a must in the Second Long Term Development Program (PJP II) which was composed in the National Natural Energy Resources Balance. (author). 1 tab, 3 figs

[en] This paper examines the adequacy of world economic uranium resources to meet requirements in the very long term, that is until at least 2025 and beyond. It does so by analysing current requirements forecasts, existing and potential production centre supply capability schedules and national resource estimates. It takes into account lead times from resource discovery to production and production rate limitations. The institutional and political issues surrounding the question of adequacy are reviewed. (author)

No abstract available

[en] The present methods of constructing and use of geological models for predicting mineral resources, including uranium ones, with the help of a computer are described. Requirements for construction of geological models are generalized and systematized. Practical examples of solving prediction problems are presented. Modelling at depth prediction on the basis of geophysical data are interpreted

[en] Considerable effort has been expended during the last 15 years to develop improved methods of analysing current and future mineral supply, with the objectives of providing illustrations of mineral supply possibilities that are more meaningful and easily understood. Significant contributions toward these objectives have been made in the course of studies on world uranium supply, which took place in the 1970s prompted by concern about the future availability of mineral fuels. The Nuclear Energy Agency (NEA) of the Organization for Economic Co-operation and Development (OECD), and the International Atomic Energy Agency (IAEA) have played a key role in these efforts, through their biennial assessments of world uranium supply. There has been a pronounced shift in emphasis in the NEA/IAEA assessments away from resource estimates by themselves as a measure of supply, because of a growing awareness that, in isolation, resource estimates cannot provide a truly meaningful illustration of uranium availability. Indeed, resource estimates taken out of context can lead to false conclusions about resource adequacy. Successive NEA/IAEA studies have made increasing use of projections of production capability that show the possible availability of uranium from different categories of resources and production centres over specified time-frames. It is believed that such supply scenarios provide a much more meaningful illustration of uranium availability for both short and long-term planning purposes. As part of the effort to introduce such an approach to NEA/IAEA uranium supply analyses, the IAEA has prepared a manual which provides general guidelines for preparing projections of production capability. It is hoped that these efforts will contribute to a better understanding of the constraints on uranium supply and to the wider acceptance of projections of production capability as measures of resource adequacy. (author)

[en] This study evaluated multiple, long-term environmental oil-contamination risk scenarios that could result from the potential leakage of UP to 1.5 million barrels of crude oil entombed in the Weeks Island SPR mine following site decommissioning and abandonment, and up to 100 years thereafter. This risk assessment also provides continuity with similar risk evaluations performed earlier and documented in the 1995 DOE Environmental Assessment for Decommissioning the Strategic Petroleum Reserve Weeks Island Facility (EA). This current study was requested by the DOE to help them determine if their previous Finding of No Significant Impact (FONSI), in the EA, is still valid or needs to be rescinded. Based on the calculated environmental risk results (in terms of clean-up and remediation expenses) presented in this risk assessment, including the calculated average likelihoods of oil release and potential oil-leakage volumes, none of the evaluated risk events would appear to satisfy the definition of significant environmental impact in National Environmental Policy Act (NEPA) terminology. The DOE may combine these current results with their earlier evaluations and interpretations in the 1995 EA in order to assess whether the existing FONSI is still accurate, acceptable, and valid. However, from a risk evaluation standpoint, the assessment of impacts appears to be the same whether only 10,000 to 30,000 barrels of crude oil (as considered in the 1995 EA), or up to 1.5 million barrels of oil (as considered herein) are abandoned in the Weeks Island SPR facility

[en] Uranium prices have followed a very sharp rise to unprecedented levels when expressed in current US dollar value: more than 1000 % increase from early 2001. For years little investments were made on uranium production capacity but now as the nuclear renaissance is looming, the market is tightening, triggering a price increase trend. When studying the availability of uranium to fuel the existing nuclear power plant fleet, it appears that the total uranium committed is slightly exceeding 2 MtU, well below the resource named current reserves definition. We had a total of 4.75 MtU of identified resources at the beginning of 2005, roughly 70 years of current reactor consumption, plus about 10 MtU as 'undiscovered resources', without mentioning 'unconventional resources'. A reasonable scenario for the growth of nuclear power implies the doubling of current installed nuclear power by 2030 (from 370 GWe today to 740 GWe in 2030). Using a very conservative assumption of stabilization of the installed power after 2030, the cumulated consumption of uranium would reach 5.8 MtU in 2050, significantly more than 2005's identified resources. In fact shortly after 2020 we will have to add resources to the 'identified resources' category. More importantly, before 2030, we must confirm 'speculative resources' into 'identified resources'. More aggressive scenarios will imply finding large additional resources shortly after 2030