Cut-off Grade

An approach to determine the complex cut-off grade of ore deposits

一种确定矿床综合边界品位的方法

Optimization of Cut-off Grade in Open Pit and Its Adjustment of Dynamic State

露天矿边界品位优化及其动态调整

Theory and Method of Intelligent Optimizing Cut-off Grade and Grade of Crude Ore

截止品位与入选品位智能优化的理论与方法研究

Regular pattern of ore drawing in the case of recovery access and research of calculating cut-off grade of ore

回收进路放矿规律及截止品位确定方法研究

An Integrated Model of PSO And ANN for Optimizing Cut-off Grade And Grade of Crude Ore

一种PSO和ANN集成的品位优化模型

Target profit index can be added to calculate the cut-off grade for target profit and margin grade .

计算过程中增加目标利润指标还可计算确保实现目标利润的边际地质品位和边际出矿品位。

The concept of the differential and cut-off grade is pointed out , and its mathematical model is built as well .

提出了级差边际品位的概念，建立了级差边际品位的数学模型。

The calculating formula of cut-off grade was proposed by the average recovery or the recovery corresponding to cut-off grade .

提出了按平均选矿回收率或按截止品位对应的回收率计算截止品位的计算公式，同时指出了计算上的困难。

The greatest height of footwall cutting is determined through the theoretical analysis of cut-off grade method and breakeven point method .

通过对边界品位法及盈亏平衡法的理论分析，确定下盘最大切岩高度。

They are respectively named cut-off grade , marginal grade , economic grade and the average grade of an ore deposit .

这4项品位指标依次为边界品位、边际品位、经济品位和矿床平均品位。

Cut-off grade method has been used to control the ore drawing in non-pillar sublevel caving mining both in and outside China .

采用无底柱分段崩落采矿法，国内外一直采用截止品位放矿法来控制出矿。

The related theories on cut-off grade for ore drawing including relax medium , continuous medium theory of ore drawing , and so on ;

分析了放矿截止品位相关理论（松散介质、连续介质放矿理论、回贫预测方法等等）；

It is concluded that location of foot-wall drawing points are closely related to orebody dip , cut-off grade and ore grade of wall rock .

认为下盘放矿点位置与矿体倾角、放矿截止品位、围岩含矿品位有着密切的关系。

Combined with the mining technical-economical indexes and cost database and the dynamic intelligent calculation procedure of cut-off grade , this paper has developed a mining industrial indexes dynamic calculation and management software .

结合矿山技术经济指标与成本数据库和多金属共生矿山多金属共生矿边界品位动态智能测算程序，开发了一套矿山工业指标动态测算管理软件。

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 .

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。

When dilutionless drawing cann 't be executed in one step , low dilution drawing can be used and the cut-off grade can be gradually raised towards dilutionless drawing .

当不能一步到位地施行无贫化放矿时，可用低贫化放矿，逐渐提高截止品位而趋向无贫化放矿。

The leaching loss rate of gold in oxidation zone , its surface indicative cut-off grade , indicative average grade and enrichment factor for two typical deposits were calculated by using the formula derived .

按此公式计算出两个典型矿床氧化带金的淋失率、地表指示性边界品位、指示性平均品位以及半氧化一次生富集带金的富集率。

Based upon the economic principles and analytical methods and combined practical production regularity of gold enterprise , the various mathematical models of cut-off grade are established , from which the quantitative basis is provided for the decision making of operation .

应用经济学原理和分析方法，结合黄金企业具体生产规律，通过建立各种边界品位数学模型方法，为企业经营决策提供量化决策依据。

After using the large spacing parameters of 14 × 16 , the current Existing Cut-off Grade Ore Drawing is especially prominent in ore loss and dilution , and then lead to the decline of recovery grade and the increasing of mineral separation .

金山店在改用1416的大间距参数后，其现采用的现行截止品位放矿在矿石损失与贫化方面尤为突出，继而导致采出品位，即入选品位降低，增加了选矿成本。

Using methods of cost-benefit comparision , marginal analysis , sinking cost analysis and opportunity cost , and combining the long-term average trend of mineral product price and production cost , a cut-off grade economical analysis model for the mine low-grade ore utilization is established .

综合地运用成本收益比较法、边际分析法、沉没成本分析法和机会成本法，结合矿产品价格和生产成本的长期平均趋势，建立了矿山低品位矿利用的临界品位的经济分析模型。

As well known , whether the merits and demerits of the mining measures and mineral structures data are evaluated or the reasonable cut-off grade of the discharging extraction process etc are determined will depend essentially on the data of the ore loss and ore dilution .

如所周知，无论是分析评价采矿方法及结构参数的优劣，还是确定崩落法放矿合理截止品位等，矿石的损失与贫化都是很重要的指标。

In Zijinshan gold mine , the cut-off grade is determined to be 0.2g/t . Different dressing processes are carried out according to the characteristics of low-grade ore . As a result , the utilization rate of resources is enhanced and better economic benefit is obtained .

紫金山金矿把矿石的最低入选品位定为0.2g/t，根据低品位矿石特点采用不同的选矿工艺，既提高了资源利用率，又获得了较好的经济效益。

After studying on the different cut-off grades for ore drawing and relations among them , some new knowledge is got : that is , combined cut-off grade ore drawing includes all kinds of cut-off grade ore drawing .

通过对不同放矿截止品位及其相互间的关系进行研究，有了一些新的认识：组合截止品位放矿方式（形式、方案）包括了一切截止品位放矿方式；