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Page 29 text:
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TECHNICAL SECRETARIAL STAFF 27
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Page 28 text:
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ensure that a complete mineral surface is present - not one with a microlayer of resin over it. When this is done, and the edges of the mould have been bevelled, it is now ready for the polishing laps. Lap I : The first polishing is done with 6 micron diamond powder. After switching on the lapping machine, clean the lap with acetone and a tissue. An even smear of mineral oil, liquid paraffin is apolied to the lap, and a small finger tip of a 6 micron-diamond is run over the lap. Stop the lap and fit tne specimens to it. The time for the first stage varies as to the texture of the specimen, so it is decided by trial and error. Otherwise, if the lap is running well, one hour should suffice before the first microscopic examination. As the particles of the metallic oxides and sulphides are very small it is advisable to use medium to high magnification to get a fair reading on the surfaces. If the pits are still present, clean the lap, recharge and rotate for a further hour. Lap II: Repeat the same process for the second grade of diamond (l-3 micron) to get more definite results. Here the surface should really show a polish, with small polishing scratches on the ore particles. Lap III: The final polish is done with 0-2 micron diamond and a small amount of oil, enough only to lubricate the lap and avoid snatching and ejection off the lap. When the surface is finished, clean it and store in a dry container to prevent moisture affecting the fine sulphides and thus spoiling the surface. I llustrations : A. Microphotograph: Thin section plain light 2.5X showing - (a) M n bed. (b) Fe bed. B. Microphotograph: Polished Section plain light 40X Grainy Pyrite. 26
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Page 30 text:
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The late Hugh M. Roberts — the great American Geologist whose faith and knowledge played a vital part in the development of the Steep Rock Iron Range, said , — THE SCIENCE OF GEOLOGY IS ONE ATTEMPT TO ESCAPE BEING LOCALIZED. WE ENDEAVOUR BY MEANS OF THIS SCIENCE TO REACH OUT BY OBSERVING AND INTERPRETING OUR SURROUNDINGS. WE LIVE IN THE MIDST OF TWO INFINITIES, ONE THAT REACHES INTO THE DEPTHS OF A MICROSCOPIC CRYSTAL, THE OTHER WE BEHOLD IN A MOUNTAIN RANGE AND IN THE IMMEASURABLE DEPTHS OF THE STARRY HEAVENS WE WISH THE LAKEHEAD UNIVERSITY GEOLOGY CLUB EVERY SUCCESS STEEP ROCK IRON MINES, LTD. ATIKOKAN - ONTARIO The Patino Mining Corporation an expanding mining and exploration company with world - wide interests We may be able to provide the career you want 7 King Street East, Toronto CANADA 28
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