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2t <br />• <br />6. REWhAtENDATION FCR MEASURES WEIICH SHOULD E3E TAKEN ~ Ul;TEELh1N1; <br />THE CtEGREE ON fY1M~i(~ ON THE SURFA(~ LAND <br />The mine development is done for roan and pillar mining, 'I'h~ <br />coal is strong and there is ro reason to assume tr,at the pr l l,+rs <br />will fail prematurely. This limitxd extraction should efficiently <br />protect the surface. <br />Up to date, there has been ro subsidence facture withrn 1!,r <br />property area. However, surveying points are plaraxKr ru bc• Lr~:,,t~,i <br />within the area. About 26 surveying points are being aiirsid.st.. ~c,. <br />installation along the line of maximum subsidence (see Figure• 1v, <br />line I), and on five lines (Nc6. II, III, IV, V, and vl). 'I?a:5e <br />• points will be stabilized in order to secure their rigidity in <br />winter and spring seasons. <br />A simple surveying point can b, m3nufuctured t,y drilling ~, 4 <br />inch hole about 4 feet deep where a metal tube is lnscrted .,r:, cc,r <br />Crete is poured between the tube and the soil. After the concrete is <br />stabilized the point is ready for the necossary measuring. <br /> <br />