shaft deepening

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• Birchtree Mine — is an underground nickel mine, owned and operated by Vale Inco in the city of Thompson, Manitoba, Canada. Birchtree mine first opened in 1966, and was placed on standby between 1978 and 1988. The mine reopened again in 1989. [cite book last =… …   Wikipedia

• Углубка ствола —         (a. shaft sinking, shaft deepening; н. Schachtabteufen; ф. approfondissement d un puits, avaleresse, ravalement; и. profundizacion de pozo) увеличение глубины действующего ствола для вскрытия и подготовки шахтного поля на новых горизонтах …   Геологическая энциклопедия

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