Innovative criteria for economical exploitation of ornamental deposits applied the cut-off grade concept

An innovative methodology and mathematical model is developed to determine the cut-off grade of ornamental stone exploitation called cut-off quality, based on the balance between the present value and production process cost. These methodology and model is validated with excellent results in nepheline syenite quarry located in complex alkaline Monchique, Portugal.     

三山岛金矿床边界品位的确定及经济评估

根据三山岛金矿当前的开采技术条件及经济技术指标,结合黄金市场价格,有必要改变边界品位指标。本文计算了三山岛金矿可利用低品位资源量,并对边界品位指标变动后的经济效益进行了评估。通过计算显示,改变矿床边界品位可以有效利用矿产资源,带来良好的经济效益。     

Optimal mill cut-off grade modeling in the mineral deposits via MIP: Haftcheshmeh copper deposit

Cut-off grade play a critical role in defining tonnages mined and processed, average grade of mill feed, cash flows, mine life time, and all major characteristics of a mineral deposit. Simply, the cut-off grade is the lowest grade at which material is considered ore and is processed to create a concentrated commodity product. Essentially, it asserts that the mill cut-off grade is a function of the ore availability and the needs of the mill. The focus of this paper is upon one of these long time-scale decisions: whether to process the extracted material, or to waste it. Consequently, an effort is made for the development of a model for optimization of mill cut-off grade which considers grade blending of mineral deposit. A new mixed integer programming (MIP) model is proposed to deal with this objective and with this model determined the mill cut-off grade of Haftcheshmeh Copper deposit. The results show the obtained mill cutoff grade from proposed model generates the optimum average grade. Therefore, generated net value (NV) from this model is nearer to reality.     

回收进路放矿规律及截止品位确定方法研究

介绍了“诱导冒落、设置回收进路的无底柱分段崩落法”的采场结构，针对其开采特点，研究了其放矿规律，确定了放矿截止品位的计算方法，为最大限度地利用矿产资源提供了依据和途径。     

论金属矿床地下开采的属性及掌握的途径

关于金属矿山地下开采的属性问题,国内很少有人讨论.根据矿床的赋存条件和矿岩的物理力学性能不同的特点,金属矿床地下开采不能做到标准化的设计,同时采矿方法的参数主要靠经验来确定等实际情况,本文得出金属矿床地下开采具有工艺学的特征,属于工艺学属性结论.针对所确定的属性,文章又给出了掌握金属矿床地下开采的途径.     

Statistic approach to the equivalent modeling of rock masses

The paper offers a procedure of creating equivalent models of inhomogeneous, viscoelastic and block rock masses based on the probabilistic approach and concept of physical volume of an inhomogeneous medium. The numerical experiments on representative structures of rock masses have shown a good correspondence between the results obtained with the accurate and equivalent models.     

Influence of geological and technological factors on the internal dump capacity in flat deposits

The authors describe a research into internal dumping in flat deposits under downdip mining and show that the internal dump capacity changes subject to the dump parameters and physico-mechanical properties of overburden in conformity with the found regulations.     

刚柔多重合理组合破解软岩高应力区支护难题

梁家煤矿为典型的软岩巷道,巷道开挖后围岩表现为自稳期短,压力显现快,单纯的锚网喷支护对服务周期相对较长的巷道支护强度严重不足。采用一次刚柔多重组合支护方式,巷道支护效果理想,安全性得到保障,并且节约工时费和材料费,对相似条件准备巷道的支护,具有很大的参考价值和推广价值。     

湖南双江口萤石矿矿床特征、控矿因素及找矿标志

针对双江口萤石矿床地质特征,结合区域地质背景、矿床地质条件、矿床成因和控矿因素,初步提出了找矿标志,该区具有较好的找矿前景.     

影响井下等级导线测量精度主要因素分析及测量方法探讨

在井下等级导线测量中,受条件限制导线布设不可避免会遇到短边的情况.当从长边向短边过渡或由短边向长边过渡,前、后视边长值相差较大时,调焦镜的运行范围增大,调焦镜运行误差会造成较大的方向误差;在短边测角时,受仪器和觇标对中误差的影响,会引起较大的测角误差.采用延伸三角形法进行短边测量,能够有效消除上述误差的影响,提高导线测量精度.     

矿产开发对地下水资源的影响及对策研究

矿产资源与地下水有共、伴生的紧密关系,但采矿须进行矿坑排水,使得采矿业与地下水具有不相容性,矿产开采不可避免地要影响和破坏地下水资源。本文从区域可持续发展角度,提出实现矿产资源开采与地下水资源保护的和谐规划理念。     

开辟石膏综合利用新途径

文章分析了高强石膏的基本性能，研究了高强石膏的生产工艺和应用及其板材的易变形和容重较大等问题。     

Ring structures as a contribution to the genesis and stress-strain state of mineral deposits

A hypothesis on the formation of the Earths ring structures is propounded. The contiguity of many commercial mineral pools to the structures in question and the connection of stress-strain state of deposits with long-term tectonic processes within them are demonstrated.Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 45–51, May–June, 2004.     

贯彻精料方针提高铁精品位

介绍鲁中冶金矿业公司选矿厂的技术改造项目，该项目工程量小，投资少，技术方案可行，经济合理，是提高经济效益的重要技术措施。     

一种新型的金相显微硬度自动分析测试方法

针对目前计算机数字图像分析技术对维氏硬度进行分析的自动化程度较低的现状,提出了一种将小波多分辨率理论用于金属表面维氏硬度实验压痕进行自动分析的方法.对压痕采样信号进行小波分解,分别对db7小波基分解的细节和逼近进行分析判断,从而得出在压痕边缘上与采样线的所有交点,应用最小二乘法拟合出压痕的边缘直线,对提取压痕进行尺寸标定,得到压痕的对角线实际几何尺寸,最终计算出试验点的维氏硬度值.系统采用上下位机微机控制方式,显微镜载物台数控系统采用嵌入式技术开发,保证了控制系统的稳定性和实时响应性.