Report of the Bureau of Mines of the Department of Internal Affairs of ...

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194 REPORT OF THE INSPECTORS OF MINES. Off. Doc. the other section of the i)iHur aud proceed in this manner until a point is reached twenty yards above the monkey, or about twenty-eight or thirty yards above the gangway; at this point, props a little stronger are put about four feet apart across the two breasts which are covered with round poles forming a battery. In due time, if the top does not squeeze aud fall after the first pillar is taken out in the manner ali-eady described, the second pillar is taken out. If the top does not fall, then the third and even the fourth pillar is taken out, if necessary, leaving a space of 20()x.3()U feet, more or less, according to circumstances. \Vhen the top in these openings does subside, owing to the number of props used, it comes down so easily that hardly any concussion is felt in the gangway below. When the top rock has fallen and filled the open space, a small buggy road is laid at the back of the fall to take the balance of the coal which was left to secure the surface. This coal has to be buggied and dumped into one of the breasts used for that purpose; all the other coal runs by gravity to the main gangway below, where it is loaded into the mine car. Where the pillars between the first and second lifts are taken out as shown on sketch, the rock taken from the gangways and breasts in the upper lifts is dumped into these openings, forming a pillar of rock instead of the coal, which has been taken out. The props and timber for securing the breasts driven up from the second lift are taken down to the first lift gangway and from there distributed and taken down as required below\ The props to secure the breasts for taking out the pillars in the third lift are taken down to the second lift and for each additional lift the props would be brought down to the gangway in the lift above until the basin would be reached. Although this method of mining and robbing pillars has been in practical use at this colliery during the last two years, not one fatal or serious accident has occured in the sections which have been robbed. I am convinced that thousands of tons of coal have been taken out which would have surely been lost, if the old system of skipping and robbing pillars had been adopted. I have examined the inside workings at this colliery and watched the progress of this work very closely during the last two years, and I must say that I honestly believe that 90 per cent, of the coal has been taken out of all the places robbed and finished. In looking over former mine Inspectors' reports, I came across the one issued for 1887, in which Mr. William Stein, mine Inspector, of Shenandoah, Pa., for the Sixth District, makes a favorable mention of Mr. John L. Williams' plan for the filling of large openings in the Kohiuoor Colliery, at Shenandoah, with culm, in order to save pro])erty and lake out more coal in the robbing of the Mammoth seam, where it is (hick. Since then, the jilan has been adopted and works successfully all through the anthracite region. In my report for the year 1897, ten years after the time Mr. Stein wrote his report, I have no hesilalion in saying that Mr. Williams may well feel i)roud of another undertak-
No. 10. SEVENTH ANTHRACITE DISTRICT. 195 ing which he originated, viz: the taking out with safety of 00 per cent, of the coal in the small seams on heavy dips. It is calculated that 1,000,000 tons more (;oal can be taken out of the Richards Colliery alone by adopting this method, which would have otherwise been lost. My object in giving a di^scriptive d(»tail of the method used in mining and robbing pillars at this colliery is that it may be instrumental in putting it into the minds of others mining coal and placed in like circumstances to adopt this system wherever practicable. 12
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Accident. Cause Nature 52 REPORT OF
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108.50 104.30 137.60 168.80 150.20
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