File:Canadian mining journal January-June 1905 (1905) (14802387483).jpg

Identifier: canminingjjanjun1905donm (find matches)
Title: Canadian mining journal January-June 1905
Year: 1905 (1900s)
Authors:
Subjects: Mines and mineral resources
Publisher: (Don Mills, Ont., Southam Business Communications)
Contributing Library: Fisher - University of Toronto
Digitizing Sponsor: University of Toronto

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ion are ruled across the map in yellow or pur-ple ink at every loo feet of elevation for facility in working. When the long section is taken on the dip or plane of thedip of the vein, a table is worked out for values from i-ioo ft.on the vertical and their equivalent values on the plane chosen.This means the saving of a lot of time in reduction of elevationof points. Geological Maps.—The particular geology of each level isworked up by the engineers and is plotted on tracings fromthe working map. Each level has a separate sheet. The workunderground is plotted to scale on small vellum sheets aboutlo by 8 inches. Each of these has traced on it a portion of thelevel. Thus there are a number of these sheets to each level.They are made to overlap each other. This is worked uptwice a month. When a small sheet is completed it is placed under bigtracing and geology is traced through. When level is com-pleted it is carefully examined and details are filled in where THE CANADIAN MINING REVIEW.
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Com n fr T^q cK Cs>o^ *t\) FooW nor ^W««A on Ara»»\Vv«^ft5 intervening geology is obvious. The geology is put in withcoloured pencils. Certain colours are used to represent thediiferent geological structures, thus the (red) = veins, the(yellow) = non-mica dykes, the (brown) = the mica dykes,the (green) = the country rock, the (blue) = the faults. Thehanging walls and foot walls of the veins are always markedH. W. and F. W. The dip of veins, dykes, etc., are indicatedby —► and degree of dip thus —► 85° the —► always point-ing in the direction of the dip. The diamond drill holes are plotted on these geologicalsheets and their geology plotted on them. By help of these,many difficult problems of structure are often simplified.When a diamond drill core assays above a certain value theamount of Au, etc., is stated in small figures at that point. Thegeology of the diamond drill holes is plotted in similar col-oured inks to the veins, dykes, etc. The plotting is done bydr

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