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合理开采深度的确定是矿山经营参数优化中的一个重要参数．合理确定衰老矿井的开采深度不仅关系到矿井的生产规模、服务年限，还关系到矿井今后的转产与多种经营．作者结合开滦矿务局某衰老矿井的实例，用投入产出分析法研究了开采深度问题，定量得出了该矿合理的开采深度，为上级领导制定矿井近期生产与长远规划提供较可靠的理论依据．
The determination of reasonable mining depth is an important parameter in mine operation parameter optimization. Reasonably determine the mining depth of aging mine is not only related to the scale of production of the mine, service life, but also related to the mine in the future conversion and diversification. Based on the case of an aging mine in Kailuan Mining Bureau, the author studied the problem of mining depth by the method of input-output analysis, obtained the reasonable mining depth quantitatively, and provided more reliable information for the leaders at higher levels to formulate the near-term mine production and long-term planning Theoretical basis.