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WDC has successfully
completed feasibility studies for large and small projects in many of the
world's mining districts.
Among WDC's feasibility studies are:
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The scope of WDC's feasibility studies includes:
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WDC's feasibility study for the Magma Superior underhand cut and fill mine in Arizona resulted in reopening a successful small high-grade operation. WDC was responsible for designing the dewatering programs and other engineering assignments in this mine, as well as for cost accounting and scheduling for its development and startup. |
| In 1992, WDC
successfully completed
a detailed feasibility study and basic engineering for the $300 million
Robinson copper and gold project near Ely, Nevada, for Magma Copper Company. WDC designed a 35,000-tpd sulfide copper concentrator, later expanded to
46,000 tpd, the largest new copper concentrator in the United States in
recent years. The design and engineering included more than 80 drawings
of the plant and infrastructure and all mine drawings.
This was the first grass-roots project to be based on the use of a single grinding line for such a large milling capacity. WDC developed detailed specifications for SAG mills and ball mills. WDC prepared all bidding documents for detail engineering and construction management, managed the bidding process, evaluated the bids and recommended the successful bidder. WDC also was awarded the detail design, procurement and construction management for the pit dewatering system. |
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Ore reserves, mine planning and mine equipment selection |
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Metallurgical sampling program, including drilling and bulk sampling |
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Metallurgical test program, development of flowsheet, design criteria and selection of mill equipment |
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Powerline routing and cost estimating |
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Exploration and development of a water supply for the mill and potable water |
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Detailed tailings dam design |
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Geotechnical engineering program for pit slope design and mill foundations |
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Concentrate rail loadout facility design |
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Operating cost estimates for all areas |
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Capital cost estimate for total project |
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Financial analysis |
Utilizing a team approach, involving client staff, WDC staff and numerous subcontractors — all managed by WDC — was the hallmark of the large-scale project.
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In 1991, WDC
was contracted to prepare a Bankable Feasibility Study for the Kori Kollo
project, majority owned by Battle Mountain Gold Company. The study was
used by Battle Mountain Gold to obtain project financing from international
lending institutions including OPIC, IFC and CAF. WDC and BMG engineers
worked together to
produce the Bankable Feasibility Study. Tasks completed included: |
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preparation and review of ore reserve estimates |
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preparation and review of mine capital and operating cost estimates |
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review and modification of plant capital and operating estimates |
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preparation of cash flow analysis |
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Environmental Engineering |  |
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Winters, Dorsey & Company, LLC
Mining and Metallurgical Industry Engineers
5151 East Broadway - Suite 1506
Tucson, Arizona USA 85711
Phone: 520-722-5600
Fax: 520-722-5623
