No abstract available

[en] Separate abstracts were prepared for 5 papers of this meeting

[en] COGEMA applies, in underground operations, working systems adapted to the shape of the ore bodies, as illustrated by two methods recently developed in France. (1) ECARPIERE mine stopes a vertical vein simultaneously using cut and fill for the upper part and undercut and fill with cemented backfilling for the lower part. This method allows the concentration of several working faces in a limited area and consequently the concentration of equipment, power distribution, backfilling means, primary ventilation, supervision and maintenance. The resulting output was significantly increased. (2) LODEVE mine operates a short wall method for mining thin layers; ore is mined according to the mineralization limits, waste is blasted at the footwall and used as part og the integral backfilling. The method improves profitability of thin mineralizations in the general frame of a complex carbonate leach ore processing where dilution must be drastically reduced

[en] The NURE program effort will continue to generate and employ improvements in assessment technology. Assessment procedures in current use are carefully documented to the extent that a useful audit trail is available; these data extend from the actual recording of field observations and identification of favorability areas to the selection of the proper control areas and application to the actual assessment function. BFEC is confident that the basic system of assessment of the unknown by analogy to the known is fully tenable. And, BFEC is proud to be a contributing party to the NURE program which is of a magnitude not hitherto undertaken by any government or private organization

[en] Although no uranium discovery has been reported in the province so far, Alberta is experiencing an upsurge in uranium exploration activity. A portion of the Athabasca Basin, in which the Saskatchewan uranium deposits are located, lies in northeastern Alberta. Within this region 24 uranium leases and 19 uranium prospecting permits have been registered. In 1979 the Geological Survey of Canada published airborne gamma ray spectrometric maps of the area. Following introduction of amendments to the metallic minerals regulations to stimulate mineral development, the Alberta Department of Energy and Natural Resources will reopen the undisposed areas of the Athabasca Basin for the granting of mineral rights. (LL)

[en] The present invention relates to an improved method for the solution mining of a mineral from a subterranean formation. More specifically, the invention relates to an improved method which enhances significantly the recovery of the mineral from a subterranean formation via solution mining by reducing the oxidant consuming reactions which compete with the mineral for the oxidant injected therein

[en] Process for recovering at least one metallic element selected from within the group composed of uranium, molybdenum, vanadium, copper, selenium and germanium contained in kerogeniferous ores. In particular, it relates to a process for the more complete recovery of the uranium contained in certain sedimentary ores. It involves: - grinding the ore down to the mesh that will release the kerogen particles, - separating the kerogen from the carrying ores by flotation, - modifying the kerogen by heating, - processing the residue for extraction of the elements it contains

[en] Uranium exploration methods are briefly reviewed: aerial (radiometric, spectrometric), surface (mapping, radiometric, geophysical, geochemical), sub-surface (well logging, boring) and mining methods in the different steps of a mine project: preliminary studies, general prospecting, detailed prospecting deposit area and deposit estimation. Choice of methods depends strongly on geographic and geologic environment. Three examples are given concerning: an intragranitic deposit Limousin (France), a deposit spatially related to a discordance Athabasca (Canada) and a sedimentary deposit Manyingee (Western Australia)

[en] Bacteriological leaching process of uranium ore: the efficiency of various acid solutions and the effect of heating treatment of the ore on the development of microorganisms. It is important to consider the use of suitable acid solution if microorganisms will be employed in biohydrometallurgical process. The use of such solution is not only important from the amount of soluble minerals produced, but also from the economic point of view. In the first step, four kinds of solutions with various concentrations of ferrous iron were used. Sulfuric acid was applied as control. Acid solution used in the experiment had a pH between 2-3, and the process was carried out by shaking. From this experiment it was found that solution of ATCC (American Type Culture Collection) and 9 K which contained 21 and 44,2 g/l FeSO₄. 7H₂O₃ respectively, gave recovery of uranium of about 17 to 20%, while with sulfuric acid and NCIB (National Collection of Industrial Bacteria) solution which contained 1 g/l FeSO₄. 7H₂O resulted a recovery of about 3 to 8%. Heating which was carried out for sterilization of the ore, did not kill bacteria at all. (author). 2 figs., 13 refs

[en] Around the rhodanian basin, coastal deposits contain uranium occurrences, either within kaolinite levels equally enriched with few metals (Li, Cr, V) or within lignites. In the first case, the syngenetic accumulation might be sourced from lateritic paleosols while in the second case, there is epigenetic accumulation removed by organic matters after oxidized ground water moving