Fragmental massive sulphides at the Heath Steele Mine, New Brunswick

Abstract Both the B and A-C ore zones of the Heath Steele Mine contain extensive areas of brecciated ore. This texturally distinct ore type has been tentatively defined as a fragmental or conglomerate massive sulphide.It consists of subangular and round fragments of pyrite up to 30 cm in diameter, smaller quartz clasts and chloritized, mineralized, lithic fragments in a faintly banded matrix ofpyr-rhotite and chalcopyrite. The chalcopyrite is concentrated in the pressure shadows of the fragments and appears to reflect remobilization and recrystallization during a deformation which postdates the formation of the clasts.A generally conformable relationship with the underlying banded pyrite-sphalerite ore, discordancy with the host banded argillites, spatial distribution and similarity to Kuroko ores suggest that the fragmental ore is of primary origin and that breccia formation is probably due to soft-sediment slumping or sliding initiated by volcanic explosions, as hypothesized for similar massive sulphides in various Japanese mines. It is nevertheless recognized that certain structural features in some clasts may result from deformation preceding the formation of the breccia, and at this stage a tectonic origin cannot be completely eliminated.
Keywords: Massive sulphides, Breccia ore, Sediment slumping, Heath Steele Mine, Mineralization, Ore deposits, Deformation, Metamorphism.
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Summary: This paper compares a number of operating conventional and semi-autogenous grinding circuits and analyzes them in regard to operating and capital costs, specifically as applied to porphyry copper ores.
Publication: CIM Bulletin
Author(s): DEREK J. BARRATT
Keywords: Equipment, Grinding, Milling costs, Porphyry ores, Afton Mines, Island Copper Mines, Lornex Mining Corporation, Similkameen Mining Company, Pima Mining Company.
Issue: 811
Volume: 72
Year: 1979
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Summary: There is a difference in design parameters between steel linings and rubber linings for grinding mills. The basic design parameters for rubber are described and a comparison is made between steel and rubber in different applications.
Publication: CIM Bulletin
Author(s): GUSTAV NILLSON
Keywords: Equipment, Maintenance, Linings, Rubber linings, Grinding mills, Mill linings, Impact grinding, Attrition grinding, Abrasion grinding.
Issue: 811
Volume: 72
Year: 1979
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Summary: In conjunction with the over-all goals of energy conservation at Inco Metals Company, a program of improvement in compressed air utilization was established. Air flows were monitored and compared to calculated requirements to establish efficiency by area. With the cooperation of area management, measures were implemented to reduce nonproductive usage.At the operation, annual savings in power consumption alone were 80,000 dollars. The program is being extended to other mine areas within the...
Publication: CIM Bulletin
Author(s): J. G. CULLAIN
Keywords: Equipment, Maintenance, Energy conservation, Inco Metals Company, Underground mining, Compressed air, Air flow, Power consumption, Levack Mine, Annubar, Compressors.
Issue: 811
Volume: 72
Year: 1979
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Summary: The paper uses two hypothetical, but typical, situations to show that hydraulic rock drilling equipment has very significant economic advantages over pneumatic equipment both in drifting applications (even in the situation where advantage is not taken of the high productive capacity of the hydraulic drill) and production drilling applications.Other factors, including the non-economic advantages and the disadvantages of hydraulic drilling, are discussed. The paper concludes with a brief...
Publication: CIM Bulletin
Author(s): R.G. BRADBURY
Keywords: Equipment, Maintenance, Drilling, Hydraulic drilling, Drifting, Tunnelling, Cost factors.
Issue: 811
Volume: 72
Year: 1979
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Summary: This paper explores the financial impact of the initial version of the Saskatchewan Potash Reserve Tax; first, alone; and second, in conjunction with the other taxes affecting the industry's profitability. Although the introduction of the Reserve Tax is shown to lead to a substantial increase in a hypothetical firm's effective tax burden, the more unusual outcomes frequently attributed to this levy only occur after the imposition of other non-provincial tax rulings. Despite this qualification...
Publication: CIM Bulletin
Author(s): DAVID L ANDERSON
Keywords: Taxation, Reserve taxes, Potash industry, Saskatchewan, Mining costs, Markets.
Issue: 811
Volume: 72
Year: 1979
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Summary: This article summarizes some of the principal features of the taxation of industrial mineral mining in Canada. Where the rules applicable to such operations differ from those pertaining to the production and processing of precious and base metals (non-industrial minerals), the two sets of rules are compared.If a conclusion could be drawn from such an over-all comparison, it may be that the total tax burden on an industrial mineral mine can be considerably more onerous than on both base metal...
Publication: CIM Bulletin
Author(s): R.D. BROWN
Issue: 811
Volume: 72
Year: 1979
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Summary: Demands for increased grinding production, lower-grade ore and limited capital have resulted in ever larger grinding mills, some as large as 36ft (11 m) in diameter and 12,000 hp (8,950 kw). The result is often fewer machines per plant, with a greater dependence on each machine. To meet these reliability requirements, manufacturers of mills, drives, castings and other components have had to be innovative and creative in their design. Only by thorough review of past designs and practices and...
Publication: CIM Bulletin
Author(s): C. A. ROLOFF
Keywords: Equipment, Maintenance, Milling, Grinding mills, Feeders, Trunnions, Mill heads, Lubrication, Mill shells, Mill drives, Drive trains, Motors, Cascading.
Issue: 811
Volume: 72
Year: 1979
Text
Summary: The construction, commissioning and operation of a continuous pilot-scale selective agglomeration (oil agglomeration) unit are described. This plant has been used to recover fine coal from an effluent stream that is produced by a jig plant which scalps the coal from a New South Wales (Australia) colliery. The reject slurry is extremely fine (66.5% minus 53 pm) and has an ash content of approximately 40%. The pilot plant can treat up to 0.3 tonne/h of this slurry, producing average product...
Publication: CIM Bulletin
Author(s): L.W. ARMSTRONG
Keywords: Coal treatment, Effluents, Agglomeration, Selective agglomeration, Environmental control, Tailings.
Issue: 811
Volume: 72
Year: 1979
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