Mineralogical and process controls on the oxidative acid-leaching of radioactive phases in Elliot Lake, Ontario, uranium ores: II – Brannerite and allied titaniferous assemblages

Abstract In representative, run-of-mine samples from the Panel and New Quirke mines of the Elliot Lake uranium district, Ontario, brannerite, a metamict uranous titanate, occurs in microscopic grain-aggregates which display wide variations, both in textural habit and in the relative proportions of brannerite, titania polymorphs and/or “uraniferous titania”. As is widely documented, much of the brannerite occurs as trellis-like arrays of laths and needles pseudomorphing rutile or anatase. In some cases, the laths and needles are cemented by coffinite. Brannerite, with an average composition of (U0.629 Th0.039Ca0.20 ) (Ti2.199 Fe0.13 )O69 contains =3 wt% Th and is distinctly Ti-rich relative to the ideal composition, UTi2O6 . Much of the Si reporting consistently in electron microprobe analyses (between 1 wt% and 5 wt%) is tentatively attributed to contamination by the quartz-sericite matrix, and a minor proportion is attributed to the presence of coffinite intergrowths. “Uraniferous titania” (average partial composition by weight: 10.8% U, 0.3% Th, 32.9% Ti) is considered to represent an intermediate stage in the conversion of titania to brannerite.
Keywords: Brannerite, Coffinite, Elliot Lake, Leaching, Metallurgy, Mineralogical controls,
Oxidative leaching, Process controls, Titaniarich phases, Uranium ores.
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Publication: CIM Bulletin
Author(s): Samantha J. Espley, J. Denis P. O’Donnell, Denis Thibodeau, Pamela Paradis-Sokoloski
Keywords: Corrosion resistance, Mineguard spray-on liners, MIROC, Shotcrete, Support products.
Issue: 1001
Volume: 89
Year: 1996
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Summary: Cablebolts are an important support component in modern underground mines. If an optimized cablebolt system is to be achieved, it is insufficient to focus on cablebolt layout design or on cablebolt installation in isolation. Cablebolt support, like all engineered systems, requires a holistic approach, encompassing integrated elements of design, implementation and verification. The “Cablebolting Cycle” described in this paper incorporates these components along with related tools and procedure...
Publication: CIM Bulletin
Author(s): D. Jean Hutchinson, Mark Diederichs
Keywords: Cablebolting, Rock mechanics, Underground mining.
Issue: 1001
Volume: 89
Year: 1996
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Summary: Development of underground openings in a deep mining environment requires a support system that is able to absorb energy as a result of dynamic loading due to rockbursting and blasting and static loading due to convergence as the development face advances. The support system must be resistant to corrosion and be effective over the life of the excavation, upward of ten years, yet simple and cost effective to install. Over the past two years, research has been conducted at INCO’s Creighton Mine...
Publication: CIM Bulletin
Author(s): Chris C. Langille, Dwayne D. Tannant, John Galbraith
Keywords: Deep mining, One-pass support systems, Rock mechanics, Support systems, Underground mining.
Issue: 1001
Volume: 89
Year: 1996
Text
Summary: Ammonia present in a variety of mine/mill waste waters was almost completely oxidized to nitrogen by chloride mediated electro-oxidation. A closed circuit operation of preconcentration of ammonia on a suitable adsorbent (e.g. zeolite or a resin) followed by brine stripping of ammonia and electrolysis of the strip liquor seems to have sound technical, economic and environmental merits. The removal of ammonia, cyanide, cyanate or thiocyanate from a mine/mill waste water (e.g. gold mill), either...
Publication: CIM Bulletin
Author(s): Kazi E. Haque, D.J. MacKinnon
Keywords: Ammonia, Chloride electrooxidation, Cyanide, Cyanate, Electro-oxidation, Mediated oxidation, Mineral processing, Thiocyanate, Waste water.
Issue: 1001
Volume: 89
Year: 1996
Text
Summary: Kidd Creek Mines places approximately 10 000 tonnes of consolidated rockfill (CRF) daily. Consolidated rockfill comprises sized aggregate mixed with different ratios and amounts of binders. Consolidated rockfill is em ployed to simplify subsequent pillar recovery and provide improved passive/active ground support. The consolidated rockfill is designed to sustain not only the gravitational loading of the overlaying fill material, but also to some extent the dynamic loading applied during...
Publication: CIM Bulletin
Author(s): Parviz N. Farsangi, Allen G. Hayward, Ferri P. Hassani
Keywords: Rock mechanics, Kidd Creek Mines.
Issue: 1001
Volume: 89
Year: 1996
Text
Summary: To be competitive on the international market, the Canadian mining industry must reduce its costs, increase its productivity and maintain a high standard of safety. There is a great need today for improved methods that would allow the detection of geological structures in advance of mining to reduce dilution and the monitoring of underground structures to increase safety. This will facilitate planning for optimum exploitation of the mine and to increase production at lower costs. This paper...
Publication: CIM Bulletin
Author(s): M. Momayez, F.P. Hassani, A. Hara, A. Sadri
Keywords: Ground Probing Radar (GPR), Mine planning, Rock mechanics.
Issue: 1001
Volume: 89
Year: 1996
Text
Summary: Cable bolt supports are being recognized as an effective ground control system in underground
coal mines in North America, and their use has increased considerably during the past few years. The U.S. Bureau of Mines personnel are conducting both laboratory and field tests to evaluate the performance of these supports under a variety of conditions and to establish realistic design guidelines. This paper describes efforts to evaluate the capability of cable bolts to resist the high shear forces...
Publication: CIM Bulletin
Author(s): John M. Goris, Lewis A. Martin
Keywords: Cable bolt supports, Ground control systems, Longwall operations, Rock mechanics.
Issue: 1001
Volume: 89
Year: 1996
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