Identifier: transactions11cana (find matches)
Title: Transactions
Year: 1895 (1890s)
Authors: Canadian Institute of Mining and Metallurgy
Subjects: Mineral industries Mines and mineral resources
Publisher: Montreal (etc.)
Contributing Library: Knox - University of Toronto
Digitizing Sponsor: University of Toronto

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ve been drilled. Almost all of this has been ofsmall size and no holes have been deeper than 600 feet. Allwork is done by contract, the company furnishing power andwater. The mineralized portion of the core is sampled and theresults are found to agree remarkably well with those of the orebody when opened up. From several holes the cuttings werecollected every few feet and analyzed. As the values were awayhigh this method was abandoned. The location of all drill holesis surveyed and the co-ordinates and elevation above sea-level ofthe collar of every hole noted. If the hole varies from the verticalthe course and dip are also kept. Drill holes can then be plottedindependently of all other information. These figures are kept-et of books together with all other fad.- regardingthis work. Several holes which have been cut underground atdistances of about 300 feet below the collar have been found to befrom two to four feet from the vertical at that depth. 26 402 The Canadian Mining Institute
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Fig. XI—Section showing- Construction of Chute. Dimensions of carHeight, 6 feet ; Width, 6 feet; Length, 12 feet; Capacity, 10 tons. Granby Mining Methods 403 Surveying and Mapping.—Where the conditions are the samethe surveying operations are, I think, much like those in otherB. C. mines. The co-ordinates of all important stations are kepton different sheets in loose leaf ledgers. Depending on the im-portance of a piece of work the notes may be plotted by co-ordin-ates, by tangents or with a small protractor. It has been foundnecessary to keep a considerable number of maps on file. Ageneral map showing the bulk of the companys land, buildingsami underground workings is made to a scale of 100 feet to theinch. Combined sill floor plans on a scale of 40 feet to the inchare made of t he Knob Hill-Ironsides and Gold Drop mines. Brownprint copies of these are placed in the shift bossesoffices. It hasalso been found necessary to keep the stopes above each level on aseparate map and sepa

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