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<br />COLO. TECH. CENTER <br />CONT'n <br /> <br />When we drilled here we picked some holes, <br />I will go into more detail later, in this <br />one we drilled a pillar within that mine; <br />a specific pillar that was shown on that <br />mine map. We drilled down 250 feet to <br />280 feet and we hit those pillars every <br />time. So, as far as I'm concerned, there is <br />no question in my mind, that the mapping <br />as furnished to the State Bureau of Mines is <br />accurate mapping, and I have never been <br />able to establish that it was not. I have <br />accepted it as the basis for many of our <br />conclusions. After we have obtained these <br />maps, they show for example as I was just <br />discussing, areas within the mine that have <br />been completely mined out. This is shown <br />by shaded pattern on this mine. They show <br />colors of areas that were not mined or were <br />left as unmined areas. Again we show these <br />on the map. They also give us a date of <br />when the mine was closed. <br />We have on this map four mines. One is the <br />Nonpereal which was closed in 1925. There <br />is the Centennial which was closed in 1952. <br />The Regal Mine was closed in 1947, and the <br />larger area depicts the new Centennial Mine <br />which was also closed in 1952. I bring out <br />these points at this time because it is <br />important to those people who have studied <br />failu!re or subsidence in mines. It's time <br />dependent. You will find that one of the <br />discussions that will always be brought up <br />is "well how do you know what will happen in <br />time?" There have been enough studies <br />throughout the world at least we have a fair <br />framework to understand what the effect of <br />time will be. The other information to be <br />compiled is shown on this map. These are <br />the locations of drill holes, which were <br />drilled by the Rocky Mountain Fuel Co. and <br />we have the logs in our private files on <br />those. We went to the State Engineer, <br />we got all the logs of the water wells, and <br />plotted those on the mine. Very often they <br />show where the coal is if they have been <br />logged well. We took all the information <br />from the mine maps, and they gave us information <br />as to the quality of the coal, or the depth <br />of the coal, and we have incorporated this <br />on the map. After we had that much of the <br />map compiled, I sat down and said "Well, <br />what do we do about subsidence?" <br /> <br />-8- <br />