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iii iii~iii~iiiuiii 999 ~~ ~~~ ~~~~ San Luis Proiect News Summer/Fall 1990 Information on the San Luis Project, Castilla County, Colorado PLANT CONSTRUCTION, EQUIPMENT ACQUISITION IN FULL SWING Battle Mountain Gold has begun construction in earnest on the processing plant and spent ore management facilities for the San Luis Project. Battle Mountain expects the plant to be up and running in early 1991. "It's all happening at once," said Gary Dodson, operations manager of the San Luis Project."We'llhaveabout ISOpersonsonsite daily through November or December. Startup is scheduled for January." Work on the pro- cessing plant building it- self isbeing headed up by The Industrial Company (TIC) of Steamboat Springs, Colorado. TIC, which maintains an of- fice in San Luis, mobi- lized its forces in late May. The on-site work force of about 79 persons includes about 50 local personnel. So far, most of the concrete foundations for the processing plant have been poured. Installation of mechanical systems began in August. The tanks used in the gold ex- traction process are al- most complete. Personnel from Minproc, an engineering firnt with offices in Den- ver, are on site handling quality assurance and quality control on con- struction of the process- ingplant. The processing plant building will enclose the mill and pump areas. The refinery will be built as an addition to the main structure. Processing tanks also will be pan of a single, compact complex. The plant's milling azea will house two primary units, a 3,000 horsepower SAG mill and a 2,500 horsepower ball mill. SAG stands for "semi-autogenous grinding," a process in which much of the work of grinding down large lumps of ore is done by tumbling the m against each other. Here is a rundown on other parts of the construction process which are either under way or about to begin at the San Luis Project site or its ancillary facilities: • At the end of September, the water pipeline to the plant site from Battle Mountain's water supply on the Columbian ranch was 99 percent completed. The pipeline was delivered in late August. In all, Battle Mountain will install about 10 miles of pipeline to carry water to the San Luis Project from the ranch. TIC will be responsible for welding the pipeline. Having the pipeline in place will cut down on track traffic which has been gener- ated hauling wafer to the project site. Water carried to the site by pipet ine will be available only for dust control and soil compaction work un- til BattieMountain obtains final approval from the Colorado water courts to use its water supply for mining and milling. • Battle Mountain Gold has taken delivery virtually every day during August on pieces of equipment which will be installed in the processing plant itself. • Construction has be- gun on the facilities for management of spent ore. This part of the project is being handled by Twin Mountain Rock, aDenver- based, civil works con- tractor. Another contractor, Gundle Corp., is begi nning tolayounhesynthetic1iner which will underlay the spent ore management area. The Liner will be in- stalled over a compacted foundation prepared by Twin Mountain Rock. Also on site is Steffen Robertson Kirsten (SRK), an engineering Finn with offices in Denver. SRK i:. conducting the quality assurance and quality control program on conswction of the spent ore management facility.