Table of Content

08 June 2009, Volume 39 Issue 06

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Analysis of Water Inrush Factors and Control Measures for the East and West Haulageways in Baixiangshan Iron Mine

JIANG Wen-Fu, HE Ke-Qiang, LI Xing, BAI Jian-Ye, HOU Fang

2009, 39(06):  1-5. 

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Baixiangshan iron mine is an extreamly complex water-rich deposit. Its large faults, small insidious faults, joints and fissures, and the badly sealed drilling holes all contribute to water inrush that is endangering the mining. The longitudinal diagram of the east and west -495 m haulageways were drawn based on the available geological data. The paper highlights the analysis of the risk of water inrush when a haulageway pierces in the aquifer and intersects a fault, and the discussion of the technology of water exploration and control under high water pressure of fault. Meanwhile, direct and indirect blocking ways are proposed in view of the depth character, distribution and water inrush mechanism of badly sealed drilling holes, aiming to provide some references to the capital construction and ore extraction of Baixiangshan Iron Mine and in similar domestic mines.

Research on Setting the Roof Protection Layer for Extracting the Pillars in Large Rooms at High and Medium Levels

WEN Zhi-Jie, ZHU Yong-Peng

2009, 39(06):  6-9. 

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For the control of the overlying filling body in extracting the pillars in large rooms at high and medium levels, a mechanical state model of the roof of drift stoping face was established by using the finite difference simulation software FLAC3D and the stability of the orebody at setting different pillar and drift widths was calculated. The feasibility of extracting the pillars by upward drift continuous mining with advanced grouting was demonstrated and a series of safety technical measures taken before the pillar extraction were proposed: advanced roof-making by grouting, support enhancement by long cable anchorage and setting of roof protection layer. It was concluded that the subsidence of the overlying filling body can be effectively controlled by this roof protection layer so as to safe extraction of the pillars.

Evaluation of the Alternatives for Mined-out Area Disposal Based on the Identical Degree of Set Pair Analysis

ZHOU Jian, SHI Xiu-Zhi

2009, 39(06):  10-13. 

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In view of the incompatibility of indexes in the comprehensive evaluation of alternatives for mined-out area disposal, the indexes such as safety (safety coefficient), feasibility, cost and required time were combined, by the set pair analysis method, into a relative closeness degree of optimal evaluation sets for describing the comprehensive benefits of mined-out area disposal plans. A scheme with best comprehensive benefit was obtained from five alternatives by the evaluation. It is shown that the result of the evaluation by set pair analysis is well consistent with that by fuzzy optimization method, presenting a new way for the comprehensive evaluation of mined-out area disposal.

Analysis of the Factors Influencing the Grouting Reinforcement Effects of Fractured Rockmass

YAN Feng, JIANG Fu-Xing

2009, 39(06):  14-17. 

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Rockmass grouting reinforcement, a complex process affected by various factors, can not only improve the overall stability of fractured rockmass but also reduce the rockmass permeability so as to prevent underground water inrush. Four kinds of cement concrete specimen were designed, including the single oblique joint, a group of cross-oblique joints, a group of parallel joints and double oblique cross (parallel）joints, and the influencing factors of fractured rockmass were studied through model test and numerical simulation. The results indicate that the effects of grouting reinforcement of fractured rockmass are related to the fracture distribution, connectivity rates and fragmentation degree of rockmass.

Technical Scheme for Recovering the Remaining Ore in Open-pit Slope in the Overlying-Bed Formation by  Caving in Transition to Underground Mining

HUANG Zheng-Quan, LI Jian-Qi, 吕Bao

2009, 39(06):  18-20. 

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An efficient and safe recovery of the remaining ore in the overlying bed formation by slope caving is an important issue faced by the mines in the transition from open-pit to underground mining. The practice shows that an integral large scale blasting of the remaining part of pit or the later period working pit enables an efficient and safe recovery of the remaining ore within the slope in the subsequent sublevel extraction and the formation of an adequately thick overlying bed. The practice in Baoguo Iron Mine is presented.

An Artificial Neural Network Model for Predicting the Residual Subsidence of Abandoned Mine Goaf

ZHANG Hong-Zhen, DENG Ka-Zhong

2009, 39(06):  21-23. 

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Based on the analysis of the factors influencing the residual subsidence of a single working face and the available observation data after the maximum subsidence speed, the model for predicting the residence subsidence of abandoned mine goaf is established by adopting L-M BP algorithm. A comparative analysis of the model is made and the results show that it is feasible to predict the residence subsidence of abandoned mine goaf by artificial neural network method, which is of positive significance.

Experiment and Calculation of Vibration in the Roof Caving of Underground Mine Cavity

XIE Liang-Bo, LIU Wei-Zhou, GU Hong-Jian, XING Hong-Yi

2009, 39(06):  24-26. 

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The shock wave produced by the roof caving against the bottom in underground mine cavity will have impact on the nearby structures and facilities. In view of such problem that may occur in some large underground mine cavities that haven't been treated for a long time, a simulation experiment was made. From the analysis of the experiment data calculation, the propagating law of cavingcaused vibration was drawn, providing a theoretical reference to the evaluation of vibration impact.

Study of the Ore-Drawing under Ore Isolating Layer in Caving Based on SLS System

DONG Xin, LIU Xiao-Bo

2009, 39(06):  27-29. 

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The theoretical feasibility of ore-drawing under ore isolating layer in pillarless sublevel caving was studied and the simulation experiments were carried out using SLS system. The results show that the method is feasible. To reduce the isolating layer's thickness, the alternating convex-concave of the isolating surface is allowed, which will not damage its function. To keep a planar downward movement of the isolating layer between sublevels, the insolating layer's thickness should be increased.

Analysis of Uranium Mine Slope Stability Based on Neural Network

ZHU Yu-Feng, ZHOU Shi-Jian, ZHU Guo-Gen, LU Tie-Ding

2009, 39(06):  29-31. 

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How to accurately forecast the landslide has become one of the challenges of mining process. The paper describes briefly neural network and BP network model, and analyzes BP network's structural characteristics, parameter selection, data collection and processing, and construction of network model. A forecast model is established with the slope stability state in CNNC Jin'an Uranium Mine as the learning and training sample and the forecast sample. The stability analysis method based on BP neural network technology and its effectiveness are discussed. The real case computation shows that the forecast of slope stability by neural network method has achieved satisfactory results, providing a reference to the assessment of the similar slopes and the feasibility of applying the neural network in mine slope analysis assessment.

Effects of the Ore Pillar Reservation in Backfilling Body on Surface Subsidence

JIA Jing-Li, CHEN Juan-Nong, GUO Jun, XIAO Cang-Yan

2009, 39(06):  32-34. 

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With a growing shortage of mineral resources, the exploitation of deposits under building, road and waters has become of great significance to China's economic development. Above Yunjialing Iron Mine are Yunjialing Village and Yushiwa Iron Mine' living area, and therefore, it belongs to this type of mines. In its mining plan, the method of room-and-pillar mining with subsequent filling is adopted and 21% permanent pillars is reserved as the result of  project analogy method. The simulation work is made with the finite difference FLAC software. A simplified mechanical model is established based on the investigation of mine engineering geology, stope structural parameters and in-situ stress field. The surface deformatin law deduced from the simulation results is: the surface subsidence value is the largest at the center of mined-out area, making the area form a basin, in which the subsidence is roughly symmetrical, with the largest subsidence value corresponding to the center point of the area.

Stability Analysis of Independent Mined-out Area and Artificial Pillars in Gold Rock Mining

LIU Li-Hua, GONG Qing-Ping, LUO Tie-Niu

2009, 39(06):  35-39. 

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A comprehensive test on the mining method for thin and medium thick gold rock deposit was carried out. Stability analysis was made on an independent mined-out area by short-hole shrinkage stoping with artificial pillars and its reinforced concrete artificial pillars so as to evaluate their engineering quality, which aimed to provide an assistance to increasing the enterprise benefits by safe production, shortening the engineering period and reducing material consumption.

Study on the Neural Network Model for Forecasting the Blasting Vibration Intensity

吕Shu-Ran

2009, 39(06):  40-42. 

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Blasting vibration control has been an important research subject in engineering blasting field and the accurate forecast of blasting vibration is the premise and basis of vibrating control. BP neural network is a neural network model that is most widely used in non-linear forecast. A BP neural network model was established for forecasting the blasting vibration speed and compared with common linear recession method. The comparison results show that the neutral network forecast model has higher accuracy.

Optimization of the Development Transport Plan for Capacity  Expansion Transformation at Ekou Iron Mine

HE Xiu-Ying

2009, 39(06):  43-45. 

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The paper describes the necessity of the transformation for capacity expansion in Ekou Iron Mine and analyzes the problems in the transformation. In view of the current state and problems in its mining， considering in a comprehensive way the rational connection between the ore and rock transport of various mining sections, the optimization of the ore development transport and rock transport of mining system was made. As a result, a smooth ore and rock transpor was realized after the transformation, providing a strong guarantee for a sustained stable 7.5million t/a mining capacity of Ekou Iron Mine, which illustrates the great significance of optimizing the mine development transportation plan.

Monitoring Research on the Law of Deformation and Movement of the North Wall of Yanqianshan Iron Mine

ZHANG Bao-Cai, XIAO Hui

2009, 39(06):  46-48. 

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The upper-medium part of the north wall of Ansteel Yanqianshan Iron Open-Pit Mine is composed of soft rocks such as carbonaceous phyllite and chlorite-phyllite and a large area deformation and cracking of about 110m rockmass have been formed due to mining unloading and rainfall. The deformation scope, sliding trend and significant rainfall-related features of the rockmass are determined by surface displacement monitoring. The deformation monitoring of the sliding body, the sliding law of the deformation zone and the corresponding measures taken to ensure the production safety are described.

Research on the Flotation Process for the HIMS Concentrate of Baiyunebo Oxide Ore

HU Yi-Ming, LIU Jun, ZHANG Yong

2009, 39(06):  49-51. 

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The reverse flotation currently used for treating the concentrate of high intensity magnetic separation (HIMS）of Baiyunebo oxide ore in BaoSteel's concentrator has poor separation performances, affecting the concentrate quality. Tests were therefore made on several processes including single reverse flotation, reverse flotation-positive flotation, and positive flotation-reverse flotation. The results showed that the closed flowsheet of reverse flotation-positive flotation achieved the best results, with the iron concentrate grading 59.32% at a recovery of 64.52%.

Experiment Study on the Beneficiation of a Micro-fine Magnetite Ore from Qinghai

LIU Jin-Chang

2009, 39(06):  52-55. 

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To exploit and utilize a micro-fine magnetite ore from Qinghai, beneficiation tests were made on it. The results show that adoption of single magnetic separation can not obtain an iron concentrate grade of over 60% even if the ore is ground to 95%-500 mesh. The combined process of magnetic separation and reverse flotation can obtain an iron concentrate grading 60.11% at a recovery of 60.20%at a final grinding size of 80% -400 mesh, and an iron concentrate grading 67.42% at a recovery of 56.92% at a final grinding size of 95% -400 mesh.

Test Research on the Direct Reduction by Fluidized Bed- Magnetic Separation of Hematite Ore from Zhaokua, Yunnan

ZHANG Chao-Ying, ZHU Qing-Shan, HOU Bao-Lin

2009, 39(06):  56-59. 

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The hematite ore from Zhaokua has a low grade and fine dissemination size. The test on the direct reduction-magnetic separation of this ore was made, with H₂ and N₂ mixture in a volume ratio of 1∶4 as the reducing gas. The run-of-mine ore ground to 92% -150 mesh was treated by direct reduction for 70min at 700 ℃ to get a metallization rate of 85.89%. The reduced ore was then finely ground to 3.98 μm on average and separated in a magnetic tube at 63.66 kA/m. As a result, an iron concentrate grading 73.04% at a recovery of 77.28% was obtained.

Selective Grinding of Low Grade Bauxite in Ball Mill Grinding

ZHU Yi-Min, HAN Yue-Xin, WANG Ze-Hong, TIAN Yi-Lan

2009, 39(06):  60-63. 

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The selective grinding of diasporic bauxite with a 4.4 ratio of Al₂O₃ to SiO₂ from Henan Great Wall Aluminum Co. in a φ100 mm×150 mm ball mill was investigated. The results show that,at a grinding size of 50% -74 μm, its selective grinding effect is good, high material-ball ratio is benefit to vary grinding effect and the grinding concentration has little impact on the product size composition but high impact on the ratio of Al₂O₃ to SiO₂ of each size fraction of the product. With the grinding mediums filling ratio and medium size composition used in this test, at a material-ball ratio of  1.2, a 70% grinding concentration and grinding size of 50% -74 μm, in the course size fraction of the product, the +0.18 mm Al₂O₃-SiO₂ ratio is greater than 7.5, the yield of the fractions is 27% and the Al₂O₃ recovery is 30%.

Experimental Research on the Column Flotation of Micro-fine Pyrite Particles

CHENG Yu, SONG Yong-Sheng, LI Bin, WANG Qin-Qin

2009, 39(06):  64-68. 

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The effect of reagent dosage and aeration rate on the total recovery and the recovery of size fractions in treating 86.88% -19 μm micro-fine pyrite ore by swirl injection flotation column was studied, and the recovery effects of the swirl injection flotation column and conventional flotation machine for this micro-fine pyrite were compared. The results show that when the swirl injection flotation column is used, there is a compromise between the frother dosage and aeration rate while the collector dosage should be larger than the maximum value used in this test, so as to make up for the insufficient collector amount due to the strong consumption of collector by extremely fine particles. In terms of pyrite recovery, the flotation column is evidently superior to the flotation machine for -19 μm size fraction, and basically the same with the latter for 19~30 μm size fraction and however, both are not ideal for -3 μm size fraction.

Effect of Combined Depressors on the Floatability of Chalcopyrite and Pyrite at Low Basicity

ZHOU Yuan, LIU Liang, ZENG Juan

2009, 39(06):  69-72. 

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The effect of five combined compressors, namely Na₂S₂O₃+ pyrogallic acid, NaClO+ pyrogallic acid, CaCl₂+tannic acid, KMnO₄+tannic acid and NaClO+ sodium humate, on the floatability of chalcopyrite and pyrite at low basicity of pH=8 were studied. The results showed that all of them can be used as the selective depressor of pyrite in the flotation for separating copper from sulfur but are different in the selectivity and dosage. With the combination of NaClO+ sodium humate as example, the pyrite depression effects of combined depressor and single depressor were compared and the result proved that the combined depressor has a better effect. Finally, the depression mechanism of NaClO+ sodium humate for pyrite was studied by infrared spectroscopic analysis.

Experimental Study on the Beneficiation Process for a Tungsten and Molybdenum Ore from Fujian

LUO Xian-Ping, FU Dan, CHEN Sheng-Hu, YUAN Xian-Qiang, YANG Bei, ZHANG Jun

2009, 39(06):  73-76. 

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A tungsten and monlybedenum ore from Fujian contains mainly molybednite and wolframite as valuable minerals that are associated with pyrite. Beneficiation tests were made on this ore to provide a basis for its exploitation and utilization. The process consisting of preferential molybdnium flotation, sulfur flotation from the tailings of molybenium flotation and wolframite recovery by gravity separation was finally adopted through comparative tests, which obtained a molybedenium concentrate grading 80.77% at a recovery of 51.31%, tungsten concentrate grading 63.80% at a recovery of 68.31% and a sulfur concentrate grading 41.54% at a recovery of 97.67%, achieving a good comprehensive recovery of the valuable elements of the ore.

Research on the Recycling of Aqueous Solution of Leaching for Vanadium Extraction from Stone Coal Calcine

YANG Dong, ZHANG Yi-Min, LIU Tao, LU Min

2009, 39(06):  77-79. 

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In light of the large water consumption in the stone coal calcine leaching for vanadium extraction, research test on the recycling of aqueous solution was made in a process consisting of two stage water leaching and one stage acid leaching. The test results show that when the aqueous solution is not recycled, the unit water consumption of leaching is 7.45 m³/t while when it is recycled in certain way, the water recycle rate can be as high as 83.8%,which can reduce the unit water consumption to only 1.25 m³/t and the tail water production from 7.45 m³/t to 1.25 m3/t accordingly, thus greatly reducing the pressure of tail water treatment. Moreover, the recycling of aqueous solution can enrich the vanadium in the leaching solution, reducing the pressure of the downstream processing of leaching solution and the vanadium loss by resin adsorption of the residual vanadium in the tail solution.

Test Research on the Beneficiation of a Polymetallic Iron Ore from Henan

ZHANG Zi-Ye, CHEN Hong-Yi, LI Shao-Ying

2009, 39(06):  80-83. 

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A Henan magnetite ore contains also copper and sulfur minerals, with a considerable amount of sulfur minerals being pyrite. Test research was made on this ore for the industrial evaluation of the related deposit and the ore beneficiability. The results show that a combined process of sequential flotation of copper and sulfur and low intensity magnetic separation of flotation tailings can recover in a comprehensive way the copper, sulfur and iron from the ore, with the iron concentrate grading 65.10% at a recovery of 57.23%, sulfur concentrate grading 42.00% at a recovery of 95.62% and copper concentrate grading 19.20% at a recovery of 52.79%, The iron concentrate contains 0.03% copper and 0.25% sulfur, which satisfy the state standard for the impurity content in Class 2 iron powder concentrate.

Experimental Research on the Lead Separation from an Oxide Lead-Zinc Ore from West China

XIA Qing, YIN Yan-Fen, LI Xiao-Bo, CHEN Zhong-Yu, LI Feng

2009, 39(06):  84-87. 

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The oxide lead-zinc ore from west China is characterized by complex mineral composition, many secondary oxidized minerals and difficult beneficiation. The explorative test indicated the difficulty in zinc separation and therefore, the stress was laid on the lead separation. In light of the ore properties and mineral floatability, a gravity separation was introduced properly in the multi-stage sulfidization flotation process. As a result, a lead concentrate with a 47.66% lead grade, 3.49% zinc and 70.28% lead recovery was obtained, realizing the lead recovery from this ore.

Test Research on the Sulphide Ore from Tonglushan with Mixed Collector

LI Xian-Yuan, SHAO Zhi-Yuan

2009, 39(06):  88-90. 

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The property change of the sulfide ore of Tonglushan Copper-Iron Mine led to the decline in copper recovery. Laboratory test was made on using MB and MOS-2 collector combination instead of sodium isobutyl xanthate. The following industrial test indicated the MB and MOS-2 collector combination can raise the copper, gold and silver recoveries of copper concentrate by 0.49，3.62 and 3.47 percentage points respectively, and meanwhile, reduce the No. 2 oil consumption by more than 40%. In this way, the adoption of this collector combination for the sulfide ore of this mine can bring an economic benefit of 1.6506 million yuan per annum.

Experimental Research on the Sulfur Reduction of Iron Ore Concentrate of Chengchao Iron Mine

ZHANG Xing-Wang, ZHANG Qin, HUANG Li-Li, SUN Zhi-Yong, DENG Bing

2009, 39(06):  91-94. 

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The iron concentrate of WuSteel Chengchao Iron Mine contained about 0.3% sulfur. To reduce the sulfur content to below 0.1%, laboratory flotation test was made. Flotation using the ethyl xanthate and butyl xanthate collector combination could reduce the sulfur in the iron concentrate to 0.095% but needed a collector dosage of 500 g/t, which could be reduced to 200 g/t when the iron concentrate was ground to 82% -400 mesh. Moreover, the sulfur content in the iron concentrate could be further reduced to 0.080%.

Study on the Process Mineralogy of a Copper-Nickel Ore from North Korea

YUAN Zhi-Tao, CHENG Shao-Yi, ZHAO Li-Bing, YU Fu-Jia

2009, 39(06):  95-07. 

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The process mineralogy study was made to identify the mineral composition, copper and nickel occurrence forms of a copper nickel ore from North Korea, its structure and texture, and the dissemination characteristics of its main minerals. The results show that the copper and nickel mainly occur in the forms of pentlandite and pyrite that are easy to float. However, other sulfides have close and complex dissemination relation with pentlandite and pyrite, bringing unfavorable effect on the separation of copper and nickel.

Investigation on the Process Mineralogy of a Low Grade Iron Ore from Xinjiang

Lv Xian-Jun , QIU Jun, CHEN Ping, HU Shu-Gang

2009, 39(06):  98-101. 

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To identify the process mineralogical properties of an iron ore from Xinjiang so as to provide a mineralogical basis for its beneficiation research, a systematic investigation was made of its mineral composition, iron occurrence mode and magnetite dissemination by chemical analysis, X ray diffraction and optical microscopy. The results show that this ore is a low grade magnetite-hematite ore with mainly magnetite, and has an average iron grade of only 17.33%, including 71% magnetic iron. Due to their fine dissemination and close association with gangue minerals, the magnetite particles are hard to be fully liberated, bringing difficulty in their separation.

Rapid Polarographic Determination of Micro Indium in Zinc Flue Dust

LIANG Xin-Yuan, LI Xuan-Hai, CAI Zhuo, LIU Chao-Qian, WEN Hui-Zhong

2009, 39(06):  102-103. 

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The zinc flue dust sample was digested by HCl-HNO₃-HF and the indium content was directly measured by a single-sweep polarography in the supporting electrolyte solution of HCl-HONH₃Cl. The effect of reagent dosage and some interference ions were studied，and the suitable conditions were selected. The experimental results show that a sensitive polargraphic wave of indium complex is produced at -0.63 V (vs. SCE), whose peak current has a good linear relationship with indium concentration in the rang of 0.01~5  g/mL，with the detection limit being 0.003  g/mL. This method is simple，rapid，sensitive and accurate. When it was used for direct determination of micro-amount indium in flue dust of zinc smelting samples，the RSD was 0.5%~2.7 % and the recovery was in the range of 98%~104%，with the results agreeing with those obtained by ICP-AES.

Research on the Automatic Embedding of Mining Subsidence Forecast Data into Mine DEM

HAN Kui-Feng

2009, 39(06):  104-106. 

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The characteristics of several kinds of forecast result data of mining subsidence (sinking， inclination， curvature， horizontal movement  and horizontal deformation） and their representation methods were analyzed. Based on this, a pre-treatment method for the forecast result data of subsidence was proposed. As a result of the research, a method for embedding these data in mine DEM-bilinear resampling interpolation was put forward, which was proved to have attained the goal by real case, making a contribution to mine DEM updating.

Discussion on the Geological Characteristics of Metallic Deposits in Kukexiluke, Xinjiang and Their Metallogenic Relation

HUANG Jian-Guo, CUI Chun-Long, ZHU Yu-Yin

2009, 39(06):  107-112. 

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In a 1∶50 000 regional geological and mineral resources survey by new metallogenic theory and effective prospecting means, several mineral occurrences involving not a few types of metals such as Au, Ag, Cu, Pb, Zn, Mo, W and Fe were discovered in Kukexiluke. These deposits are controlled by a regional ore-forming fault-Kukexiluke fault and distributed in a belt-shaped extension and concentrated way in the metamorphic rock of Algonkian and Palaeozoic Erathem. The authors discuss preliminarily the metallogenic relations between the orebodies and the country rocks in terms of the rockmass artificial heavy placer of ore district, trace elements of country rock, main mineral occurrences and their rear earth elements, and point out in a preliminary way that Kalakulumu rockmass may be the substance source for the ore formation of some mineral occurrences in this ore district.

Discussion on the Orebody Geology and Deep Prospecting in North Section of Sijiaying Iron Mine

LI Xin

2009, 39(06):  113-116. 

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The orebody geology and deep prospecting in the north section of sijiaying Iron Mine, eastern Hebei province is outlined, which has rich iron resource and enormous iron orebodies. Based on the previous geological work results and the reality of stripping work in mine construction, it is held that it is possible to increase the iron ore resource in the depth of the north section of Sijiaying Iron Mine and proposed that a new ore prospecting mechanism be set in accordance with the Decision of the State Council on Enhancing the Geological Work.

Application of GPS in Mine Control Survy

YANG Yu-Fang

2009, 39(06):  117-119. 

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GPS（Global Positioning System）is a satellite navigation and positioning system  developed and put into use by USA. Its application has covered various fields of national economy. In control survey, it has been widely used in geodetic survey, engineering survey, aerial photogrammetric survey and topographic survey. The paper presents the application of GPS system in topographic control survey and the author's practical experiences in its application

Geochemical Characteristics and Metallogenesis of Qingshan Gold Deposit in Shaanxi Province

PENG Hui-Juan, WANG Xiong-Wu, ZHOU Yun, CHEN Bing, QIN Zhi-Peng, HOU Lin

2009, 39(06):  120-122. 

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The field geological investigation of Qingshang gold deposit and the geochemical analysis of its ore and country rock indicate that the ore-forming association is Au-Ag-As-Sb-Ba; the Au content in the ore occurrence stratum is far greater than the background value; both the country rock and ore have a high U/Th value, a basically identical rare earth element distribution, and Ce negative anomaly and Eu positive anomaly; the hydrogen and oxygen isotope values of the ore-forming fluid have an evident “oxygen drift”; the metallogenic temperature ranges between 160 ℃ and 220 ℃; and the fluid inclusions have high contents of Ca2＋, CO₂ and HCO_-³, indicating that the ore-forming fluid is underground thermal brine of bicarbonate-sodium chloride type. It is suggested that Qingshan gold deposit of hot spring type is formed by the chronically repeated recycling, transformation, enrichment and settlement of the Au from the source bed in the Devonian system by the underground hot brine originating from rainfall. 

Development of the Training Simulation System for Mine Emergency Rescue

SUN Xiao-Lan, ZHOU Fu-Bao, QI Xu-Yao, ZHANG Jun-Yi, SUN Zhong-Tan, ZHANG Wei

2009, 39(06):  123-126. 

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In view of the problems in the training exercises of mine rescue teams, such as lack of variety of training means, inability of training environment to meet actual need and poor training performance, a new comprehensive training simulation system for mine emergency rescue is developed, which includes the major functions of disasters simulation, such as fire, high temperature, smoke and leakage of toxic gases, and support functions for rescue training, such as video surveillance, voice communication, personnel location and physical examination. The application of the system in a 28 day-training for 36 rescue workers indicates that the simulation scenarios are true to life, visualized and of actual rescuing effect, which can dramatically enhance both physical and psychological quality of rescue team workers.

Design of GIS-based Mine Fire Control System

KONG Wei-Hua

2009, 39(06):  127-129. 

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In light of the characteristics of mine fire, based on the analysis of present fire control condition, a GIS-based mine fire control information system is designed, which is composed of GIS subsystem, main business subsystem, spatial analysis subsystem and off-line module subsystem. This fire control system can realize a rapid information transfer, information sharing and optimized resource allocation and dispatching, and is capable of rapidly synthesizing various main factors to generate the rescue plan.