Genesis of the Changlingzi Zn–Pb deposit in the southern Great Xing’an Range, northeastern China: constraints from fluid inclusions and H–O–S–Pb isotope systematics

The Changlingzi Pb–Zn deposit is located in the southern Great Xing’an Range metallogenic belt of Northeast China. This deposit experienced two types of mineralization including skarn (ore block I) and hydrothermal vein (ore block II), and their orebodies are hosted mainly in the Lower Permian Zhesi Formation. The hydrothermal mineralization is classified into two metallogenic periods: skarn (stage 1) and sulfide (stages 2, 3, and 4). The skarn period affected only the ore block I, whereas the sulfide period similarly affected the two ore blocks. Fluid inclusion studies indicate that the ore-forming fluids during the early stage were medium- to high-temperature, high-salinity heterogeneous NaCl–H2O fluids, and that they eventually evolved to low-temperature, low-salinity homogeneous NaCl–H2O fluids by late stage. Studies of the hydrogen and oxygen isotope compositions (δ18OH2O = −13.85‰ to 3.95‰, δDH2O = −132.8‰ to −102.7‰) show that the ore-forming fluids gradually evolved from magmatic water to meteoric water. Sulfur and lead date suggest that the ore-forming materials were probably derived from deep magma and the Permian strata. Although our data show that ore blocks I and II, in terms of genesis, were skarn- and medium- to low-temperature hydrothermal vein-types, respectively, the ore-forming fluids of both ore blocks were the same period, and the differences in mineralization type can be related to the wall rocks.

Mineralization and metallogenic model of Daletingchagan Pb-Zn-Ag polymetallic ore in Dong Ujimqin, Inner Mongolia

Daletingchagan Pb-Zn-Ag polymetallic ore, located 70 km away to the Baogeda Mountain in Dong Ujimqin, Inner Mongolia, is a Pb-Zn-Ag polymetallic orefield, found based on that Geological prospecting institute of Liaoning province carry out the synthesis method for prospecting project of Baogeda forest field. This mineral deposit could be divided into two ore block, genetic types of west ore block is contact metasomatic type, east ore block is shallow epithermal deposit related to volcanic agencies and the subvolcanic, this paper is mainly on comprehensive study of east ore block mineralization, aiming at providing a beneficial reference of further exploration for concession.

Lineament Length and Density Analyses Based on the Segment Tracing Algorithm: A Case Study of the Gaosong Field in Gejiu Tin Mine, China

This study used the Segment Tracing Algorithm (STA) to extract lineaments from remotely sensed images. A computer program was then written to calculate the lineament densities and lengths. In Gaosong field, 3,233 lineaments were extracted based on a 200 m × 200 m grid size. The results indicate that most lineaments lengths are between 30 m and 50 m, and the number of lineaments within each cell ranges from 1 to 6. Areas with high distributions exist on both sides of the central region. According to the contour map of lineament length, the maximum lineament length is 380 m, and the minimum length is 30 m. The contours mainly extend in two directions, including NE and NW trends. This is consistent with the prominent NE and NW strike faults that prevail in the mining area. The results are similar to those obtained in the Machishui ore block, which has become a mine production area. High values of lineament length and density in the contour map of Gaosong field may be associated with hydrothermal tin mineralization in the study area. The results of this study potentially provide a new approach to mineral exploration in the early stage of geological prospecting.

Research and Application of the Ore Body Three-Dimensional Mathematical Model Based on Baiyang-Chuanxindong Ore Block in Bainiuchang Mine

Bainiuchang mine is located in the junction of three tectonic units. It has excellent forming geological conditions and the potential for prospecting. Among it, the Baiyang-Chuanxindong ore block has a large prospecting space. According to deposit the previous geological exploration engineering data, based on Surpac software to establish the deposit database and ore grade distribution model, and the application of ordinary kriging estimation of orebody resources, orebody resources evaluation is more reliable, accurate, efficient and fast. Through the deposit model of digitalization and visualization, it will greatly promote the process of digital mine enterprises in china.

Research and Practice of Rock Mechanics for Mining of Large and Thick Pillars with Inclusion of Fillings

Through investigation and test analysis of current situation of testing stope and surrounding filling and isolation layer of mines, understand the basic mechanical characteristics and integrity characteristic of surrounding rock mass and fillings of chamber to be mined; combining with comparative analysis of technical and economic index of mining, considering making full use of the existing personnel, equipment and technology, it is concluded that stoping technology scheme of chamber is large-diameter deep-hole afterwards filling mining method; by using the numerical analysis method, through comprehensive analysis of stress, deformation and failure characteristics of surrounding fillings in mining, finally determine the optimal recovery scheme is mining by recovery unit of upper and lower plate. At present the ore block has been successfully and safely mined. Research results can provide reference for recovery of similar ore block, in order to realize safe and efficient recovery of "island" ore block in mining with filling mining method.

Deposit Digitizing for JiaYaShan Ore Block in LanPing Pb-Zn Mine

Lanping Pb-Zn mine is the biggest Pb-Zn mine of China. It is necessary for the mine to digital. On the basis of systematic analysis of and research on Jiayashan ore block in Lanping pb-zn mine, Mine Mathematical Model software, Surpac software and Micrmine software from abroad for digitization ware used to study this deposit. Finally, a three-dimensional space deposit model was established. As a result, the dynamic management of mine has been realized, the degree of automation and systematize have been increased for mining production, the scientific help have been presented for making use of resources sufficiently and reasonably.

The Application of Ore Surface Model in Computer State Delineating Method

Traditionally, the computer method of delineation requires to establish ore block model. The block-by-section scanning operation is slow, which does not meet the large amount of data calculation., In this paper, we use the ore body in the modeling of the surface model in order to overcome the above problem. This model uses modeling method that reproduces a traditional hand-paintedtechnique, describe the spatial distribution of ore bodies through a series of plan view or profile of the ore body boundary polygon for wireframe modeling, i.e., the frame modeling method. For reading the plan view or profile of the ore body, the graphics and fractal theory are needed in the work to achieve the extraction of vector graphics map elements. After completing the extraction of ore, the wireframe modeling of the ore bodies can be established by using wireframe modeling method. Finally the wireframe model is filled by using the OpenGL technology and the surface model orebody is generated.