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2U <br />• 4. DISQJSSION ~' RESULTS <br />The lithological composition of the strata above the E seam <br />i[xlicates that the angle of draw can be safely estimated at 25 <br />degees. <br />The angle of draw outlines the ground surface areal as it i:: <br />shown in Figure 13 (topography of the property area) . Thee li rye ul <br />maximum surface subsidence is indicated on the topography map. Along <br />this lino, the row of survey monuments will be ii~stalied, is shown <br />in Figure 19. <br />• <br />• <br />