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yield in mining areas is an important factor influ-1School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China. 2School of Earth Science and Engineering, Hebei University of Engineering, Handan 056038, China. 3To whom correspondence should be addressed; e-mail: [email protected] 849
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Ultra-thick hard sandstone roofs present high thickness, poor delamination, and wide caving range. The strata pressure of the working face during actual mining increases, having a significant ...
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Soil pollution in coal mining areas is a serious environmental problem in China and elsewhere. In this study, surface and vertical profile soil samples were collected from a coal mine area in Dazhu, Southwestern China. Microscopic observation, concentrations, chemical speciation, statistical analysi …
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As the most popular deposits in China, sandstone-type uranium deposits are poor in southern China and rich in northern China − 88 % of sandstone-type uranium resources are found in sedimentary basins in northern China, mainly in Jurassic and …
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In situ leaching (ISL) is becoming the main mining practice for sandstone-type uranium deposits in China. The key to ISL technology is to aid the leaching solution in contacting the ore bed over a large range, which will induce a series of chemical reactions to extract uranium; thus, it is essential to thoroughly understand the reservoir physical …
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The Shihongtan uranium deposit in northwest China is a sandstone-type deposit suitable for alkaline in-situ leaching exploitation of uranium. Alkaline leaching …
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The Pisha sandstone is a general appellation in China for a type of fluvial clastic deposition sandstone formed during the Jurassic, Triassic, and Cretaceous periods [1,2].It is widely distributed in an adjacent region close to Shanxi, Shaanxi, and Inner Mongolia autonomous region, covering an area of approximately 16,700 km 2 [3,4].It is …
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Using seismic dispersion attribute inversion and the frequency slice wavelet transform method, we predicted the water abundance of sandstone in the coal seam roof of the Yuwang coal mine in Yunnan Province, China. The predicted sandstone water abundance was compatible with the actual water‐rich scenario observed in well logs and …
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Sandstone-type uranium deposits make up approximately 43% of all deposits in China, making them the most prevalent form of uranium deposit there. Sandstone-type uranium deposits and hydrocarbon resources …
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The Mesozoic Yili Basin of NW China represents the largest known concentration of U deposits in China and contains five major deposits, namely (from west to east) the 512 (Kujie'ertai), 513, 511, 510 (Mengqiguer), and 509 deposits. Pre-mining resources within the explored sandstone-type uranium deposits in this area are …
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The coal-bearing strata in the Ordos Basin, China, formed in the Jurassic, and the associated sandstone aquifer is characterized by a short diagenesis time and weak cementation. Affected by seepage erosion, interstitial materials migrate inside the sandstone formation, resulting in changes in porosity and permeability over time and …
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Sandstone-hosted uranium (U) deposits provide a significant U resource for nuclear energy worldwide. ... Mining and Remote Sense Detecting on Uranium Resources, East China University of Technology, Nanchang 330013, ... 3 Jiangxi Provincial Key Laboratory of Genesis and Prospect for Strategic Minerals, East China University of …
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Adopting a coal mine in Ningxia, China, as a case study, first, a variable weight model (VWM) for evaluating the potential groundwater yield (PGY) of the target aquifer was established considering ...
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The exploration and development of sandstone-type uranium deposits in China started late – from the 1950 s, and did not make any breakthrough until 1998 when the in-situ leachable Kujiertai uranium deposit was discovered in the Yili Basin (Jin & Teng, 2022).According to the latest uranium evaluation, the uranium resources in China are …
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There are significant differences in mining technology between sandstone type and hard rock type uranium deposits. At present, in-situ leaching is primarily used …
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1. Introduction. Sandstone-type uranium deposits have been an important prospecting type representing one of the most economic uranium resources due to the low mining cost and slight environmental pollution, ranking second in all types of uranium deposits (Lehmann, 2008, Zammit et al., 2014, Hall et al., 2017, Xing et al., 2017).The …
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Sandstone-type uranium (SU) deposits are mainly developed in sandstones in Mesozoic and Cenozoic sedimentary basins (Kang et al. 2020). They have become …
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These discoveries have helped China move from 3rd to 1st in reserves of sandstone-hosted uranium deposits (OECD-NEA/IAEA, 2014). ... 2019). Likewise, the economical and environment-friendly in-situ leach uranium mining technique for sandstone-hosted uranium deposits has also been a popular scientific issue (Su et al., …
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At present, in-situ leaching is primarily used in the mining of sandstone type uranium deposits in China, while heap leaching is often used in hard rock type uranium mining. In-situ leaching tends to pollute deeper sediments and aquifers, while heap leaching is easier to pollute surface or near surface soil and water.
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Mining under the sea is a challenging task in China. Affected by blasting, tunneling, and other engineering disturbance, surrounding rock is often in a state of cyclic loading and unloading stress.
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A conceptual model of the geo-environment for sandstone-type uranium in northern China was described, which covers the changes in the geo-environmental characteristics in the natural state, in the …
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More than 20 years of studies on green mining in China have witnessed theoretical and technological progress in water-protective mining, co-extraction of coal and gas, surface subsidence mitigation, mine waste reducing and recycling, mine dust control, etc. ... sandy mudstone, and sandstone under mining-induced stress and constant …
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The Sulige tight sandstone gas field represents a quintessential example of a tight sandstone gas field and boasts the largest reserves and production scale in China [[1], [2], [3]].In this region, effective sand formations exist as isolated lenses in the geological, with a limited range of sand connectivity, spanning less than 800 m.
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Gravity flow deposits are important hydrocarbon reservoirs in deep lacustrine deposits. Previous studies have paid much attention to the hydrocarbon reservoirs in those intrabasinal classic turbidite deposits. However, relatively little is known about the distribution of oil reservoirs in those extrabasinal hyperpycnal flow deposits. With the …
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With the introduction of in-situ leaching (ISL) mining method to China since the 1990s, an exploration climax for sandstone-type uranium deposits hosted by …
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The Ningdong mining area in the western Ordos Basin, China, mainly mines coal seam in Yan'an group, where its overlying rock is a thick sandstone layer of the Middle Jurassic Zhiluo Formation.
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The Linxing area is located in the northeastern Ordos Basin (Fig. 1); the tight sandstone gas has proven geological reserves close to 700 × 10 8 m 3 (Huang et al., 2015), exploration and development trials are underway, and many wells have encountered high-yielding industrial airflows (Ren et al., 2014).Therefore, the study of gas …
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Unconventional gas resources, including a large proportion of coal bed methane (CBM) and tight sandstone gas, are abundant in China. Presently, there is an issue of low production and high cost in single-layer mining of CBM and tight sandstone gas. Co-mining of CBM and tight sandstone gas has received extensive attention. …
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Since the 1990s, sandstone-type uranium in the northern basin of China has become the main target for mining. Uranium mining can cause a series of impacts on the environment. A conceptual model …
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For example, the mining depth in some coal districts in Western China is in the order of tens of meters, while in Eastern China, it can reach up to 1400 m. The depth of mine operations and the in-situ stress distribution control the ground deformation and failure mechanisms in the near field rock mass surrounding the openings within the various ...
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of the sandstone are approximately 23.35MPa and 8.32GPa. 2.2. Test Scheme. The test equipment adopts the GCTS RTR-1000 rock triaxial test system of the State Key Laboratory of Coal Resources and Safety Mining of China University of Mining and Technology (Beijing). The GCTS RTR-1000 rock triaxial test system is a closed-loop …
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We conclude that sandstone-type uranium deposits in northern China are mainly found in sedimentary environments such as rivers, deltas, and alluvial fans in the …
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In situ leaching (ISL) is becoming the main mining practice for sandstone-type uranium deposits in China. The key to ISL technology is to aid the leaching solution …
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Soaring demand for construction means sand mining is impacting the environment and needs regulating. Forum Institutional Sand mining is close to being an environmental crisis. ... Five things to know about the 'Summer Davos' in China. Gayle Markovitz. June 28, 2024. 3:49. These 5 facts about climate change need more …
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Because the hydrogeological studies lagging the geological exploration during the mining activities, a GIS-based the geological, tectonic and lithological composition index model is put forward to evaluate the groundwater yield zones in the sandstone aquifers in the coal basin.. Variation coefficient of slope of coal seam, intensity index of …
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