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Li J.,Central South University | Wang M.,Hunan Nonferrous Metals Holding Group Co. | Wang M.,Abra Mining Pty Ltd | He L.,Exploration Unit of North China
Geotectonica et Metallogenia | Year: 2014

The Abra Pb-Cu deposit was discovered in 1981 in the Bangemall Basin, north-western of Western Australia. The ore body is hosted in the Meso-proterozoic Edmund Group shallow marine clastic sequences. The layered ores present in the upper section, and the veined ores occur in the lower section. Because of its complicated geology and lack of detailed investigations, the genesis of the Abra deposit is debatable. In this paper, the characteristics, origin and evolution of the ore-forming fluid are investigated. Based on the results of micro-thermometry, the fluid-inclusions in the quartz can be divided into three groups: two phases H2O fluid-inclusions, fluid inclusions with CO2 and CH4, and fluid inclusions with mineral crystals. The homogenization temperatures of these fluid inclusions in the upper hematite jasperite and magnetic quartzite vary from 162.0℃ to 194.7℃, and the salinities vary in the range of 5.8%~13.0% wNaCl; while the homogenization temperatures of the inclusions in the lower chloritized quartz sandstone vary from 172.7℃ to 250.7℃, and the salinities vary within the range of 7.0%~17.0% wNaCl. The wide range of homogenization temperatures and salinities in different sections demonstrated that there was more than one phase of ore-forming fluid activities. The data of S and Sr isotopes show that the ore-forming fluid was the mixture of sea water and metamorphic water, and the ore-forming elements were leached from the host strata. And the host rocks have contributed to the ore deposit formation. The calculated densities of the fluid inclusions are from 0.885 g/cm3 to 1.012 g/cm3 based on the homogenization temperatures and salinities. The theoretical ore forming depth is around 0.22 to 1.39 km below the surface, and the Abra deposit can be categorized as a meso- and epithermal deposit.

Peng G.,Central South University | Peng G.,Qinghai Institute of Geological Survey | Wang M.,Hunan Nonferrous Metals Holding Group Co. | He J.,Qinghai Institute of Geological Survey
Geotectonica et Metallogenia | Year: 2013

With the advancement of remote sensing technology, the mineralization-related alteration anomalies can now be used as independent indicators for mineral exploration. Crosta technique, as a method for mineralization and alteration information extraction, played an important role in mineral exploration. However, the traditional Crosta technique calculates the eigenvectors of each component based on the statistical analysis of the entire image. It will produce a lot of noise in the abnormal component and reduce the accuracy of the alteration information extracted. This paper presents an improved method based on local variable window. In the improved method, the entire image is divided into a number of independent statistical analysis units by the local variable window. In each local variable window, principal component analysis and judgment of the abnormal component will comply after the elimination of interference information such as water, clouds, snow and so on. The improved method can reduce the background noise, filter interference information, and identify weak alteration information effectively. Using the improved Crosta technique, mineralization-related alteration anomalies are extracted to guide mineral resources prospecting in the Mohailaheng area, Qinghai province. The NWW-trending faults are the principal faults in the Mohailaheng area, which control the distribution of the strata and the mineralized zones. The combinations of silicification, ferritization and carbonatization anomalies within the fault zones are useful indicators for mineral exploration. There are some intensive alteration anomalies of silicification and ferritization in the intersections of fault F3, F4 and F5, which will be the high priority targets for Pb-Zn deposit exploration.

Zhang L.,Central South University | Zhang Y.-X.,Hunan Nonferrous Metals Holding Group Co. | Luo K.-M.,Hunan Nonferrous Metals Holding Group Co.
Proceedings of the 8th International Conference on Tungsten, Refractory and Hardmaterials | Year: 2011

Information on China's tungsten resource and its distribution characteristics, newly discovered huge tungsten resource, historical tungsten production and consumption, historical APT and tungsten powder productive capacity, tungsten export, tungsten waste recycling as well as the position of Hunan Nonferrous Metals Holding Group Co., Ltd. in China's tungsten industry are introduced.

Peng G.-X.,Central South University | Peng G.-X.,Qinghai Institute of Geological Survey | Wang M.-Y.,Hunan Nonferrous Metals Holding Group Co. | Chen F.-R.,Henan University | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

Iron cap formed from limonite is an important prospecting symbol of bauxite in the studied area. Based on the feature analyses of geological, spectral and remote sensing images, independent component analysis (ICA) was used to extract the alteration information of bauxite. The traditional methods of the principal component analysis (PCA) and ratio were compared with ICA. The test results show that the extraction accuracies of ICA, PCA and ratio are 84.5%, 80.9% and 79.4%, respectively. The lower the value of the first component of ICA is, the higher the degree of bauxite alteration and the extraction accuracy are. The surface area of bauxite alteration extracted from IC1 is about 210.1 km 2, and is divided into three zones. It mainly distributes in the hill and slope where the elevation is higher than 250 m. There is little bauxite in the flat zone with low elevation. The distribution of bauxite in this area is verified preliminarily, which provides very effective instruction information for further exploration.

Dai T.-G.,Central South University | Du G.-F.,Central South University | Zhang D.-X.,Central South University | Wang M.-Y.,Hunan Nonferrous Metals Holding Group Co.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

The preliminarily research focused on dispersed elements in Dachang tin-polymetallic deposits of Guangxi province. The relationships among indium, trace elements and main metal elements of wall rock and ore were introduced, as well as the relationships among indium content and distribution, and the typical characteristics of rare earth elements of igneous, wall rock and ore. The trace element analyses results suggest that indium enriches in the wall rock and varies in different lithologies, and indium is prositively correlated to Sn and Cd, and negatively correlated to Zn. The rare earth element analyses results suggest that indium content is negatively correlated to δEu in igneous rocks and positively correlated to δEu in wall rocks. The indium contents are intimately associated with δEu, LREE/HREE, (La/Yb) N in ores. The relative oxidized, weakly alkali and high temperature stage is favorable for enrichment of indium during the ore-forming process. At the end, the enrichment prospect of indium was given here.

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