Winters, Dorsey & Company, LLC Engineering and Design -- Underground Mines

Underground Mining

WDC's underground design and evaluation experience includes:

	cut-and-fill methods (overhand, underhand and mechanized)
	longhole open stoping
	room and pillar
	block caving (full gravity and mechanized)
	vertical crater retreat

WDC has experience in mining rates varying from 1,000 tpd to 60,000 tpd, and has worked in widely varying ground conditions and mine atmospheres.

WDC's underground mining services include:

	Ore reserve estimates
	Stoping sequences
	Mining method selection
	Mine planning and design
	Production schedules
	Mining equipment specifications
	Underground conveyor systems
	Underground crusher stations
	Backfill systems
	Mine access by tunnels, shafts and ramps
	Ore transfer systems
	Haulage systems
	Water handling
	Refrigeration and ventilation systems
	Electrical systems
	Contracting and contract mining analysis
	Capital and operating cost estimates
	Dewatering systems
	Contract mining bid preparation
	Design of development drilling programs
	Budget preparation
	Logistics studies

Mine Engineering -
Open Pit Mining

Process Engineering

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WDC uses geotechnical studies in the design and planning phases to analyze ground conditions, select the preferred mining methods and establish production and dilution criteria. The company has developed computer programs to analyze economic cutoff grades throughout an underground mine based on differing productivity, development requirements, ore recoveries and capital and operating costs. These tools allow WDC to design mine plans that maximize the value of the project

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

Info@wdc-inc.com