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~XHIDIT-D <br />??IP'IiIG PLAT: <br />nature of the Ore <br />Si Y COn ~~(., Cn r'~G~ ~~~I-C <br />Planning Problens <br />As z result of the difficulties encountered in locating and defining <br />these orebodies, it is usually impossible to predict the farthest limits <br />of ore in a mine. Ore is mined by a random room and pillar method ~~ro- <br />ducing ~~idely dispersed crorkings caith highly irregular configurations <br />malting adequate ventilation difficult to plan and maintain. Consequently, <br />in order to maintain haulagetaays and ventilation ainoays to serve these <br />areas, it is usually necessary to drill ventilation raises when and <br />where conditions warrant. <br />After the point an3 method of entry is established, vine development <br />plans change on a daily basis caith future ventilation raises to the <br />surface and surface facilities impossible to anticipate and locate crn a <br />long-term basis. A mining plan then reeuires the flexibility to lo<:ate <br />ventilation sites and other surface disturbances as the changing cociditioas <br />dictate. <br />