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理论分析和实例验证表明，选别式开采地下金属矿在完全相同的市场价格形势下，可能采取截然不同的边界品位控制策略。这种情况是由于金属生产和选别式地下开采的特点而引起的。这表现在地下选别式开采的金属产出量受限于采矿准备能力、入选能力（采矿能力或选矿处理能力）和冶炼能力。在金属产出的瓶颈分别出现在这三个不同的生产环节时，随市场价格的升高，若矿山着眼于长期利润目标的最优化，边界品位应分别采取降低、提高和保持不变的控制策略。
Theoretical analysis and case studies show that the selective mining of underground metal mines may take quite different boundary grade control strategies under exactly the same market price. This situation is caused by the characteristics of metal production and by-product type underground mining. This is reflected in the limited amount of metal produced in the underground separation by mining preparation capacity, inclusion capacity (mining capacity or processing capacity) and smelting capacity. When the bottlenecks of metal output appear in these three different production stages respectively, with the increase of market price, if the mine focuses on the optimization of the long-term profit target, the boundary grade shall be reduced, raised and maintained respectively and maintained unchanged Strategy.