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    Discussion on reasonable cutoff grade forore drawing in Erfengshan iron mine
    二峰山铁矿合理放矿截止品位探讨
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    Up to now, most of researches are based on the condition of gravity field, although part of researches is relative to the tectonics stress field, the influence of geological structures and tectonics stress on rock burst occurrence was analyzed qualitatively. So, it is short of the quantitative research on the rock burst occurrence condition under the action of the tectonic stress.
    截止目前为止,研究的基础绝大部分基于重力场的条件,虽然部分研究涉及构造应力场,也只是定性地分析地质构造以及构造应力对冲击显现的影响,还缺乏对构造应力作用下冲击发生条件进行定量研究。
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    And the factors need to be considered, possible problems need to be faced, necessary suggestions and measurements, and so on, are put forward from more extensive meaning.
    并在更广意义上提出了不同放矿截止品位方式进行转化时需要考虑的因素、可能面临的问题、必要的建议和措施以及具体实施中应注意的问题。
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    On the average, footage drilled per month for each drill machine went up from 284 m in 1983 to 546 m by the end of August, 1987. Experiences for this achievement may be summarized as following: 1. proper arrangement of drilling in geological exploration;
    冶金地质系统岩心钻探台月效率由1983年的284米,提高到1987年(截止8月底统计)的546米。
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    The calculation principle of cutoff grade for oredrawing was described in combination with the feature of mining and mineral processing technology of Erfengshan iron mine, some related parameters were analyzed, and the reasonable cutoff grade for oredrawing in Erfengshan iron mine was calculated. 
    阐述了放矿截止品位的计算原理,并结合二峰山矿的采选工艺特点,对有关计算参数进行了分析,计算出了二峰山矿的合理放矿截止品位。
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The selection of cut-off draw-grade is closely related to the resource reco-vory, profit and annual output of concentrate, thus it is concerned with the-composite, technical-economic effect. This paper is only to discuss emphatically one of them, that is the profit index.This paper suggests three knids of profit index to evaluate the economic effect, they are: 1) the profit per ton of the write off recoverable reserve; 2) the profit per ton of recovered orc; 3) profit-cost ratio. The relationship between marginal...

The selection of cut-off draw-grade is closely related to the resource reco-vory, profit and annual output of concentrate, thus it is concerned with the-composite, technical-economic effect. This paper is only to discuss emphatically one of them, that is the profit index.This paper suggests three knids of profit index to evaluate the economic effect, they are: 1) the profit per ton of the write off recoverable reserve; 2) the profit per ton of recovered orc; 3) profit-cost ratio. The relationship between marginal benefit and mean profit is analyzed from the point of view of marginal benefit, so that the criteria of maximum value of the above mentioned profit indexes can be deduced respectively. To use these criteria and the two break-oven points, the draw process can be divided into severed section and each of them has diffeient benefit leved, which provide economical bisis for final dcsision of cut-off draw-grade.

放矿截止品位的选择和资源回收率、盈利及每年精矿产量密切相关,从而影响到综合技术经济效果。本文仅侧重讨论其中的盈利指标。 文中推荐用三种盈利性指标去评价经济效果:1)每吨报销工业矿量盈利;2)每吨采出矿石盈利;3)利本率。从边际效益的角度分析了边际效益和平均盈利的关系,进而分别导出了上列诸盈利指标的极大值判据。应用这些判据和两个盈亏转折点,可把放矿过程划分成几个效益不同的区间,从而为最终选定截止品位提供经济依据。 使用覆岩下放矿的崩落采矿法时,矿石损失和贫化的高低,极大地影响矿床开采的经济效果。在矿床条件、崩落矿岩品位及流动特性、以及采矿方法结构参数和放矿方法一定的情况下,损失和贫化指标将主要取决于放矿截止品位的选择。 最优放矿截止品位的选定应该满足企业盈利性,资源回收率,以及最终产品的年生产能力等要求。考虑到盈利是企业活动效果的综合表现,反映了损失和贫化的影响,在决策中具有重要意义,本文拟主要就盈利性指标进行初步讨论。

On the average, footage drilled per month for each drill machine went up from 284 m in 1983 to 546 m by the end of August, 1987. Experiences for this achievement may be summarized as following: 1. proper arrangement of drilling in geological exploration; 2. making use of new techniques of synthetic diamond drilling; 3. quickening our step to renew the drilling equip merits; 4. strengthening the management of production and the research work of science and technology; 5. improving drilling operation system; and...

On the average, footage drilled per month for each drill machine went up from 284 m in 1983 to 546 m by the end of August, 1987. Experiences for this achievement may be summarized as following: 1. proper arrangement of drilling in geological exploration; 2. making use of new techniques of synthetic diamond drilling; 3. quickening our step to renew the drilling equip merits; 4. strengthening the management of production and the research work of science and technology; 5. improving drilling operation system; and 6. raising the quality of the technical ranks. It is predicted that by the year 1990 shot drillingwill be obsoleted, wireline core drilling will account for 90 per cent of the total drilled footage,and themonthly efficiency (advance) will exceed 600 m. Furthermore, microcomputer will be widely used in drilling management and the operating range and scope of drilling will be enlarged.

冶金地质系统岩心钻探台月效率由1983年的284米,提高到1987年(截止8月底统计)的546米。其主要经验是:摆正地质找矿与钻探的关系;发展人造金刚石钻探技术;更新钻探设备,加强生产管理和科研;改革施工制度;重视队伍建设。到1990年,钢粒钻进将被淘汰,绳索取心钻进将达到90%,台月效率预计将超过600米。建议重视微机在钻探管理中的应用;努力扩大钻探服务领域。

The feasible cut-off grade of ore drawing can be calculated by iteration in accordance with the relationship between variable cost,concentrate grade,recovery and grade of ore drawing. The calculation is simple and convenient than traditional one. Exampls are given to illustrate the solution steps.

在分析可变成本、精矿品位、选矿回收率与截止品位的关系的基础上,运用迭代法求出了合理放矿截止品位。该法较传统方法简单。文中列有实例说明这种方法的求解步骤。

 
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