大道沟门萤石矿矿体地质特征及找矿标志

以大道沟门萤石矿为研究对象,对矿体地质特征进行了分析,主要为矿(化)体特征、矿石质量、矿石类型、矿体围岩及夹石、矿床成因及找矿标志等,得出大道沟门萤石矿矿床类型为热液充填型脉状萤石矿床,矿床成因类型为与燕山期浅成酸—中酸性岩体有关的低温充填型萤石矿床。矿区内共圈定4条萤石矿体,矿体赋存于侏罗系张家口组流纹质凝灰岩及粗面岩地层的北东向构造破碎带中,矿体形态及产状严格受构造破碎带控制,矿体呈脉状产出,与围岩界线清晰。综合分析,该区具有良好的形成萤石矿的地质条件,矿区内沿断裂构造线走向尚具一定的找矿潜力。

四川金川县热达门锂辉石矿地质特征及矿床成矿模型浅析

近年来,四川阿坝可尔因地区近年来的探矿工作取得了巨大的突破,相续发现了李家沟和党坝两处超大型锂辉石矿床、业隆沟大型锂辉石等矿床[3],查明氧化锂资源储量超过150万吨[3],资源潜力巨大。热达门地区,具有极好的找矿潜力。本文通过对热达门矿床地质特征及矿床成因、成矿模型与区内典型矿床分析对比研究,对该矿床实现找矿突破具有重要指导意义。

案例六 券商研报的法律规制——中国宝安“石墨矿门”案的启示

【案情介绍】(一)四家券商发布利好研报2010年9月6日,湘财证券发布了一篇名为《中国宝安:房地产和新能源的价值明显低估》的研究报告,报告提到:'2008年公司合资成立黑龙江宝安新能源投资有限公司.

江西硐门矿区沉积型钒矿地质特征及成矿因素分析

通过对硐门钒矿成矿地质特征的阐述和分析,厘定其成因类型为与寒武系下统王音铺组底部黑色岩系有关的沉积型矿床,形成于海湾—泻湖相环境。该层位区域上分布广泛,蕴含有丰富的钒矿资源,并伴生镍、钼等多种有用元素,具有广阔的勘查和开发前景。

新疆和静县牙门沙拉铅锌矿矿床成因及找矿标志

牙门沙拉铅锌矿位于塔里木板块北缘(复合沟弧带)巴仑台地块的中部,矿体赋存于钾长花岗岩与大理岩化灰岩的接触带中,矿体形态呈似层状、脉状,成因类型为矽卡岩型。

河南省陕县五门沟煤下铝(土矿)地质特征与找矿标志

通过研究已探明的河南省陕县深部大型铝土矿——五门沟煤下铝(土矿)矿区的成功找矿实例,总结了五门沟煤下铝矿床的矿床地质特征、富集规律及找矿标志。其中关于煤下铝矿床赋存于上石炭统本溪组煤系底板与下伏中奥陶统灰岩的不整合之间,紫红色铁质黏土岩是煤下铝(土矿)的重要找矿标志等认识,对今后煤下铝找矿具有一定借鉴意义。

准西小铬门沟金矿控矿因素分析

准西小铬门沟金矿是在构造-岩浆活动的背景下形成的金矿床。海西中晚期浅成-超浅成岩浆活动,特别是辉绿岩的侵入,对成矿起了主导作用,而构造因素决定了含矿溶液的运移方式,控制了矿体的形态及产状。

Number and distribution of Black-necked Cranes wintering in Zhigatse Prefecture,Tibet

We surveyed all known wintering areas of the Black-necked Crane (Grus nigricollis) in Zhigatse Prefecture of the Tibet Autonomous Region during three winters.Our surveys confirm that Zhigatse Prefecture is the most important wintering area for the species,accounting in some years for as much as 39％ of the estimated world population.Counts ranged from a high of 4240 cranes in January 2007 to a low of 2636 in February 2009.Chick recruitment (chicks/100 cranes) ranged from 8.2 (January 2010) to 11.3 (January 2007).The highest concentration of cranes during all three surveys occurred on the 60 km stretch of the Yarlung Tsangpo (River) between Lhaze and Phuntsoling.To evaluate potential impacts of the Xietongmen Copper Mine,we monitored wintering crane numbers prior to mine installation in an intensive study area located between the Shab Chu Valley and the city of Zhigatse.Our surveys recorded on average 820 ± 83 cranes (SE; n =8) in this area.With the installation of the mine at a location ～50 km west of Zhigatse,increased traffic and development on the north side of the Yarlung River will likely result in a shift in crane distribution away from the north side,to nearby suitable habitats.Based on our survey results,we recommend three areas hosting high numbers of cranes in the vicinity of the mine be added to the Yarlung Tsangpo Middle Reaches Black- necked Crane Nature Reserve.These areas are Nierixiong and Jiaqingze Villages in Nierixiong Xiang and the Shab Chu Valley.

Fluid inclusion characteristics of Longmenshan copper-polymetallic deposit in Yueshan,Anhui Province,China

The types, composition and physico-chemical conditions of primary fluid inclusions were researched. The results show that the primary fluid inclusions contain vapor and liquid phase type （Type I）, daughter mineral-bearing type （Type II） and pure liquid phase type （Type III）. The compositions of vapor are mainly H20 and CO2 with a tiny amounts of CH4 and H2; the liquid phase mainly contains Mg2＋, Ca2＋, Na＋, K＋, CI- and SO]-, and w（Na＋）/w（K＋）〉l; the homogenization temperatures of the primary fluid inclusions can be divided into 190-250 ℃, 250-340 ℃ and 360-420 ℃, corresponding to the salinities of 4%-9%, 9%-14%, and 14%-20.43% （NaC1 equivalent mass fraction）, respectively. The mineralization process can be divided into three episodes： the silicatization stage, the quartz-sulfide stage, and the carbonatization stage, and all of them are associated with the ore-forming hydrothermal fluid activity. The origin of the hydrothermal fluid is from magrnatic water mainly, and later it mixes with the groundwater and meteoric water, which lead to the decrease of temperature and salinity. The decrease of salinity, temperature and pressure are the main causes of the metallogenic elements unloading and enriching in the favorable position.

Use of SAR interferometry for monitoring illegal mining activities: A case study at Xishimen Iron Ore Mine

The development and application of the ''digital mine'' concept in China depends heavily upon the use of remote sensing data as well as domestic expertise and awareness. Illegal mining of mineral resources has been a serious long term problem frustrating the Xishimen Iron Ore Mine management. This mine is located in Wu'an county in Hebei province, China. Illegal activities have led to enormous economic losses by interfering with the normal operation of the Xishimen mine and have ruined the surrounding environ- ment and the stability of the Mahe riverbed the crosses the mined area. This paper is based on field recon- naissance taken over many years around the mine area. The ground survey data are integrated with Differential Synthetic Aperture Radar Interferometry (D-InSAR) results from ALOS/PALSAR data to pin- point mining locations. By investigating the relationship between the resulting interferometric deforma- tion pattern and the mining schedule, which is known a priori, areas affected by illegal mining activities are identified. To some extent these areas indicate the location of the illegal site. The results clearly dem- onstrate D-InSAR's ability to cost-effectively monitor illegal mining activities.

Slope stability analysis of Southern slope of Chengmenshan copper mine,China

The engineering geology and hydrogeology in the southern slope of Chengmenshan copper mine are very complicated,because there is a soft-weak layer between two kinds of sandstones.Field investigations demonstrate that some instability problems might occur in the slope.In this research,the southern slope,which is divided into six sections(I-0,I-1,I-2,II-0,II-1 and II-2),is selected for slope stability analysis using limit equilibrium and numerical method.Stability results show that the values of factor of safety(FOS) of sections I-0,I-1 and I-2 are very low and slope failure is likely to happen.Therefore reinforcement subjected to seismic,water and weak layer according to sections were carried out to increase the factor of safety of the three sections,two methods were used;grouting with hydration of cement and water to increase the cohesion(c) and pre-stressed anchor.Results of reinforcement showed that factor of safety increased more than 1.15.

A geochemical survey of thermal springs in western part of Republic of Yemen and their geothermometric characteristics

The high-mineral contents of some thermal waters are believed to have medicinal properties. Numerous spas and bathhouses might be built at these hot springs to take advantage of theses supposed healing properties such as skin diseases, rheumatism and so on. This paper is to find thermal reservoir and to classify the kinds of water. The majority of thermal springs are found discharging from igneous centers of Tertiary and Quaternary volcanic fields of the western Yemen (research area). Structurally these volcanisms are connected to N-NW faults that are parallel to the main Red Sea trend. Temperature and pH values of the thermal spring range 37℃～96℃, and 6.3～8.7 respectively. The Yemeni thermal waters indicate high variability in composition since they are of Na (K)-Cl, Na-HCO_3 and Ca (Mg) -SO_4 types, whereas the surficial waters have the typical worldwide Ca (Mg) -HCO_3 composition. Different liquid phase geothermometers, such as SiO_2, K^2/Mg and Na/K. Estimated reservoir temperatures ranging 70～140℃ perform equilibrium temperature evaluation of the thermal reservoirs.

Stability control of gate groups in deep wells

In order to study stability control methods for a deep gate group under complex stresses,we conducted field investigations and analyses of reasons for damage in the Xuzhou mining district.Three reasons are proposed:deep high stress,improper roadway layout and support technology.The stability control countermeasures of the gate group consist of an intensive design technology and responding bolt-mesh-anchor truss support technology.Our research method has been applied at the -1000 m level gate group in Qishan Coal Mine.Suitable countermeasures have been tested by field monitoring.

Ash-and-Slag Wastes of Energy Sector as Raw Material for Production of Rare-Earth Metals and Alumina

The results to develop a complex technology of co-extraction of germanium and gallium from the ash-and-slag wastes of coal combustion in Ukraine were presented. Based on the study of phase changes occurring in initial raw materials as a result of its processing, it was proposed to carry out a preliminary enrichment of the raw materials in order to produce secondary sublimates. Their further processing involves a combination of leaching soluble material with distillation of germanium in the form of tetrachloride. The resulting acidic solutions are trended to the gallium extraction. Optimum conditions of carrying out of processes are recommended.The chemical and phase composition of the resulting dump products and solutions have been defined. On the basis of it ways of their processing for the purpose of reception of alumina and building materials are recommended.

Design and Implementation of Remote Control System of Coal Mine Conveyor Belt based on PLC

Aiming at the existing problems of safety, reliability and flexibility in the traditional coal mine belt transport system, this paper designed the mine centralized control system transmitted by CAN bus and PLC as the core, and use comparison instructions and trigger of Siemens S7-200 PLC, the article has elaborated the four level conveyor belt sequence control, realized the sequence start, reverse sequence stop and fault processing and other functions for four level conveyor belt, the compared with traditional timer control instructions scheme, the design has clear thinking, simple design program, and is easy to be extended to multilevel belt drive sequence control.

Water-enhanced plastic deformation in felsic rocks

Using Fourier transform infrared spectroscopy(FTIR),we measured water contents in quartz and feldspar for four kinds of felsic rocks,i.e.,undeformed granite,banded granitic gneiss,fine-grained felsic mylonite,and fine-grained quartz-mica schist,collected from Pengguan Complex and Kangding Complex in the Longmenshan tectonic zone,Sichuan,China.The absorbance spectra suggest that water in coarse-grained quartz and feldspar of undeformed granite and banded granitic gneiss occurs mainly as hydroxyl in crystal defects,and water in most of fine-grained quartz and feldspar of felsic mylonite is molecular water in inclusions and liquid-type water in grain boundaries,but in some cases it still occurs as hydroxyl in crystal defects.Water content of quartz in undeformed granite is 0.001 wt%-0.009 wt %,and that of feldspar 0.005 wt%-0.02 wt%.The banded granitic gneiss shows water contents of 0.002 wt%-0.011 wt% in quartz and 0.012 wt%-0.036 wt% in feldspar.Quartz ribbon and feldspar ribbon in fine-grained felsic mylonite show that their water contents are similar to those of coarse-grained quartz and feldspar in granite,0.002 wt%-0.011 wt%,and 0.004 wt%-0.02 wt%,respectively.Water contents of fine-grained quartz and feldspar are respectively 0.004 wt%-0.02 wt% and 0.012 wt%-0.06 wt%.Water content of quartz in fine-grained quartz-mica schist is 0.007 wt%-0.15 wt%.Water-bearing minerals display much higher water contents than those of nominally anhydrous minerals,and the percentage of water-bearing minerals in felsic rocks increases with the strain of rocks.These new data indicate that hydroxyl in crystal defects has basically not been released during the shear deformation,and on the contrary,the increase in molecular water in inclusions and liquid-type water in grain boundaries as well as water-bearing minerals after shear deformation leads to a significant increase of the water content in deformed rocks.Based on data of creep tests,it is inferred here that the fine-grained mylonites with more water have much lower strength than that of the weakly deformed coarse-grained rocks in the middle crust,and this indicates that trace amount of water significantly helped develop the ductile shear zone.