The Baker Mine operation

Abstract This paper reviews the complete cycle of a small mining operation in a remote section of northern British Columbia, including discovery, exploration, development and production. The discovery of high-grade epithermal gold-silver mineralization occurred in 1969 following a regional geochemical reconnaissance program designed to search for porphyry copper mineralization in the Cassiar-Omineca Mountains. Exploration and development from 1971 to 1979 included geological, geochemical and geophysical surveys; trenching, almost 30 000 feet of surface and underground drilling in about 100 holes and cross-cutting, drifting and raising on the principal gold-silver-bearing vein. This led to the delineation of 100 000 tons at an estimated grade ofO. 9 oz gold per ton and 18 oz silver per ton to an average depth of 120 feet below surface.
A production decision in early 1980 led to the establishment of a 100-ton per day mining operation employing about 50 personnel with all supporting infrastructure transported to the site by a Hercules aircraft. The operation was subsequently supported by its own Twin Otter aircraft with periodic Hercules campaigns supplying major items including fuel.
The mining operation included both open-pit and cut-and-fill methods. The milling operation employed conventional cyanide-leach process with cyanide destruction initially by alkali chlorination and subsequently by the Inco SO2/Air process.
The fly-in operation, initially structured on a 21-day-in and 7-day-out basis was modified to a 14-day-in and 7-day-out basis with no loss in efficiency and with a significant increase in employee satisfaction. The operation, which earned the B. C. Small Mines Safety A ward in two consecutive years in its 31-month operating history, emphasized safety and process hazard awareness. Wildlife studies in the environmentally sensitive mine area also showed that industry and wildlife can coexist in harmony.
Most importantly, the paper compares the feasibility assumptions with actual operating experience.
Keywords: Mine operation, Mill operation, Open-pit mining, Cut-and-fill method, Exploration, Mine development, Geology, Capital costs, Baker Mine.
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Publication: CIM Bulletin
Author(s): PRASHANTA K. CHATTERJEE, CHALUVADI K. SRIDHAR
Keywords: Computer technology, Mine design, Mine planning, Underground mines, Computer graphics, Scheduling, Simulation, Cost evaluation.
Issue: 893
Volume: 79
Year: 1986
Text
Publication: CIM Bulletin
Author(s): ERWIN L. ZODROW
Keywords: Coal Stratigraphy, Geochemistry, Cyclical trends, Coal samples, Sydney coalfield.
Issue: 893
Volume: 79
Year: 1986
Text
Publication: CIM Bulletin
Author(s): J.H. GRAY
Keywords: Mine modelling, Computer systems, Geology, Mine planning, Coal mining.
Issue: 893
Volume: 79
Year: 1986
Text
Summary: A program is described that helps managers and supervisors control maintenance more effectively. Work-order generation, preventive maintenance, repair parts inventory, planning and scheduling, reporting, analyzing costs, printing purchase orders and other functions are covered. Flexibility often permits integration with other programs such as payroll, cost accounting and materials management.
Publication: CIM Bulletin
Author(s): KEN MUSGRAVE
Keywords: Computers, Maintenance technology, Management, Planning, Scheduling, Materials management.
Issue: 893
Volume: 79
Year: 1986
Text
Summary: The combination of AC induction motor and fluid coupling, of either the fixed or variable filling type, constitutes a simple, low cost, highly reliable drive unit, with many applications in the mining field.
The paper will, however, concentrate on the variable filling fluid coupling in three principal applications—conveyor starting, infinitely variable speed control for slurry and slimes pumping and dewatering pumps for deep mines. Fluid couplings can be used with standard or custom-bui...
Publication: CIM Bulletin
Author(s): J. ELDERTON
Keywords: Variable speed drives, Mining applications, Fluid couplings, Belt conveyors, Dewatering pumps, Slurry/slimes pumps, Scoop control, Mining technology.
Issue: 893
Volume: 79
Year: 1986
Text
Summary: A major Canadian chromite deposit at Bird River, Manitoba is one of the largest known chromite reserves in North America but it exhibits low chromium contents and low chromium to iron ratios. Commercial beneficiation techniques permit these ores to be upgraded to concentrations which, however, remain inferior to most other ores and concentrates used worldwide for production of high-carbon ferrochromium. Analyses for reduction of low-grade concentrates by submerged-arc electrofurnace technique...
Publication: CIM Bulletin
Author(s): W. DRESLER
Keywords: Metallurgy, Chromites, Ferrochromium extraction, Submerged-arc furnace reduction, Beneficiation, Smelting, Agglomeration, Bird River deposits, Steel industry, Cost comparison.
Issue: 893
Volume: 79
Year: 1986
Text
Summary: This paper describes a highly versatile variable speed unit with a torque multiplication feature as a direct replacement for a fluid coupling. The unit is comprised of a modulating clutch with torque converter and lock-up options. The UCD does not start or stop the motor. This is carried out in the normal manner.
The UCD continually monitors and rapidly regulates the output speed to the requirement of a set point demand from input signals or a pre-set program with full manual override. The...
Publication: CIM Bulletin
Author(s): LR. BOWER
Issue: 893
Volume: 79
Year: 1986
Text
Summary: Unique production and environmental problems are associated with multiple seam mining where draglines are used for overburden and interburden removal. On the production side, the problems are decreased dragline efficiency in chop-down operations, the general need for spoil rehandle, complications in sequencing stripping and coal handling operations, and potential stability problems in highly stacked spoil.
Many variations of dragline methods have been reported in the literature to encounter...
Publication: CIM Bulletin
Author(s): SUKUMAR BANDOPADHYAY, ARUNAPURAM SUNDARARAJAN
Keywords: Computer applications, Draglines, Sub-arctic mines, Overburden removal, Loading materials handling, Multiple-seam mining.
Issue: 893
Volume: 79
Year: 1986
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