Structural character of en echelon polymetallic veins at the Silver Queen mine, British Columbia

Epithermal Zn-Pb-Cu-Ag-Au quartz-carbonate-barite veins at the Silver Queen mine near Owen Lake, west-central British Columbia, are hosted by Late Cretaceous Tip Top Hill andesitic volcanic rocks. The veins form a rectilinear northwest-northeast pattern that differs slightly from regional structural trends. The main northwest-trending veins are oriented very close to the trend of regional northwest faults, but the crossing veins tend to be more east-northeasterly (070 degrees) compared to a regional northeasterly trend (040 degrees). The character of the veins suggests they are extensional features formed by dextral slip related to Paleogene oblique subduction, or intrusion of magma at depth, or both.
In detailed exploration at the mine, the veins cannot be modelled as simple tabular sheet-like bodies. Instead, they are complex structures that divide and rejoin, forming multiple veins or stringers, or are found in shear zones as replacement features with quartz-sericite-clay-carbonate-pyrite alteration haloes of variable width that make definition of vein margins and correlation from hole to hole ambiguous. In addition, individual veins within each of the main structures have en echelon character both along strike and down dip.
Geological and assay data must be carefully studied to define the margins of these complex veins before any estimation of ore reserves may be made. Where multiple veins occur in a section, ore/gangue mineralogy, assays, character of wallrock alteration, and thickness of vein and mineralized hangingwall, median and foot-wall zones must be used to evaluate continuity of mineralized structures. Well-defined sections are projected into areas of increasing complexity. Once the vein boundaries are defined, metal concentrations, important metal ratios (Au/Ag, Pb/Zn, Cu/Zn), and true thicknesses of the vein provide the basic data for reliable ore reserve estimation.
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Publication: CIM Bulletin
Author(s): Veronique Falmagne
Issue: 955
Volume: 84
Year: 1991
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Summary: This paper reviews the development of new designs in extensible and high angle conveyor systems. These aim to overcome the limitations of prior alternative concepts in design. The application of such systems in strip, terrace, open pit and mountain mining is reviewed.
Publication: CIM Bulletin
Author(s): A. Richmond, T. Atkinson, M. Scoble
Issue: 955
Volume: 84
Year: 1991
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Summary: The Williams Mine is Canada's largest gold producer, with annual production of some 500 000 ounces of gold from two million tonnes of ore. Highly mechanized and automated underground mining practices are utilized at the property in order to help achieve high levels of productivity and the most cost-effective mining possible.
Planning and design parameters for the underground ore handling system at the Williams Mine are described in this paper. Particular reference is made to the consideration...
Publication: CIM Bulletin
Author(s): Henry Smith, Stu Brown
Issue: 955
Volume: 84
Year: 1991
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Summary: Exploration and development of mineral resources in developing countries by Canadian-based multinational mining companies is becoming increasingly common. One problem being encountered is that the objectives of the governments of developing countries can differ from those of developed countries. These objectives are not always consistent with maximizing returns from the projects, which can create conflicts between the mining company's responsibility to its shareholders and the desire to be a...
Publication: CIM Bulletin
Author(s): Robert B. Parsons
Issue: 955
Volume: 84
Year: 1991
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Summary: Minnova Inc. has five operating divisions thoughout Canada. One of them is Lac Dufault which was established in 1964.
Lac Dufault is located 15 km north of Rouyn-Noranda, in what is known as Noranda volcanic centre, in northwestern Quebec. For more than 25 years, Lac Dufault has produced copper, zinc, gold and silver from four different mines: Norbec, Mitten-bach, Corbet and now Ansil.
Ansil, officially in production since July 1989, is one of the deepest mines presently in production in...
Publication: CIM Bulletin
Author(s): J. Desrosiers
Issue: 955
Volume: 84
Year: 1991
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Summary: British Steel has increased its usage of stainless steel for bunker, silo and chute linings to reduce maintenance costs and improve productivity.
A generation of low cost 12% Cr steels has been specifically developed to satisfy the needs of hardness, flow promotion and through life costing which are demanded by bulk solids handling industries.The range of stainless steels include: a very hard martensitic grade which is particularly suitable for high stress applications where impact and...
Publication: CIM Bulletin
Author(s): J. Peace, J.R. Fletcher
Issue: 955
Volume: 84
Year: 1991
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Summary: Comme l'exploitation d'un gisement a grande profondeur represente un defl de faille et que la profondeur a laquelle se situe celui d'Ansil varie de 1200 m a 1460 m, nous avons du mettre en place une infrastructure de surface d'envergure incluant un treuil de production et un chevalement d'une tres grande capacite. De meme, I'infrastructure sous terre a eteproposee en tenant compte de cefait important; d'ailleurs, I'excavation de deuxpuits circu-laires dont I'un est en beton et acier et...
Publication: CIM Bulletin
Author(s): Richard Samson
Issue: 955
Volume: 84
Year: 1991
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Summary: This paper compares the behaviour of gold and ore in the grinding circuit of Hemlo Mines Ltd. Particular attention is given to grinding kinetics, classification behaviour, and liberation. For grinding kinetics, laboratory grinding of gold flakes and silica, 840 \im to 1200 \an in size (14/20 mesh), was also performed to provide a standard for comparison and to study in a controlled environment the mechanisms of breakage, folding, smearing and impacting.
Grinding kinetics were characterized at...
Publication: CIM Bulletin
Author(s): S. Banisi, A.R. Laplante, J. Marois
Issue: 955
Volume: 84
Year: 1991
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