File:Graphite (1920) (14598003159).jpg

Identifier: graphite00cana (find matches)
Title: Graphite
Year: 1920 (1920s)
Authors: Canada. Mines Branch (1901-1936) Spence, Hugh S. (Hugh Swaine), 1885-
Subjects: Graphite
Publisher: Ottawa : Thomas Mulvey
Contributing Library: University of Connecticut Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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nsist of the original main pit, from which practicallyall the ore raised has been secured; a shaft sunk some 400 feet to the northof the above, and a third small pit sunk about 100 feet to the south. Themain opening consists of a shallow trench, or rather series of small trenches,for the greater portion of its 400-foot length, becoming wider and deepertowards its eastern end. At the eastern extremity, a shaft has been sunkto a depth of 250 feet, following the ore-body. This shaft is on an inclineof about 60° N.W. for 150 feet of its depth, from which point it graduallyapproaches the vertical (see Fig. 3). Development of the ore-bodyunderground has been carried out by means of three main levels run in bothdirections from the shaft for a distance of about 200 feet along the ore-body.The levels are placed at depths of 100, 150, and 200 feet, and work has^lately been proceeding on a fourth, at 250 feet, which is being carried in aneasterly direction, toward the crest of the anticline. 33
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34 In 1916, a shaft was sunk to a depth of 106 feet at a point 400 feetto the northwest of the main opening, and from it two drifts were run40 feet towards the latter at depths of 50 and 100 feet. No ore of anyconsequence is reported to have been met in these workings. Fig. 1 shows the general layout of the workings, position of drill holes,etc. The deposit, as exposed at the various levels, and more particularlyin the deeper workings, consists of a series of three rich graphite bands,separated by graphitic limestone, rather than of a single ore-body. Ofthese bands, the centre one is the thickest and has been most worked, butthe width of all three is decidedly variable in the different depths. Thetotal thickness of the graphitic zone is 40 feet at its widest point, as sofar determined, namely at the extreme eastern end of the main pit. Whilethe graphite content of the rich zones will run as high as 20 per cent, theaverage is considerably lower; that of the graphitic limestone separati

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