Ore and Energy Resource Geology最新文献

{"title":"Hyperspectral inversion of rare earth element concentration based on SPA-PLSR model","authors":"Dan Ke ,&nbsp;Wenkai Wang ,&nbsp;Huan Mo ,&nbsp;Fawang Ye ,&nbsp;Wei Chen ,&nbsp;Wanming Zhang ,&nbsp;Sirui Wang","doi":"10.1016/j.oreoa.2025.100086","DOIUrl":"10.1016/j.oreoa.2025.100086","url":null,"abstract":"<div><div>Quantitative study of the relationship between the hyperspectral characteristics of carbonatite rare earth elements and their chemical concentration is of great significance for detecting carbonatite rare earth resources using remote sensing hyperspectral technology. Due to the high resolution and large number of bands in hyperspectral data, it is crucial to effectively extract characteristic spectral bands with a high correlation with rare earth element concentration for estimating rare earth element concentration based on hyperspectral data.Thirty-three samples of rare earth ore were collected from the Maoniuping rare earth ore district, and indoor hyperspectral measurements were conducted using SVC HR1024I ground-based spectrometer. The Cerium(Ce) element concentration was chemically analyzed by ICP-MS. To improve the accuracy of the spectral inversion model and minimize the interference of stray light, noise, baseline drift, etc., the original spectral data were resampled at intervals of 10 nm first, and then the resampled results were subjected to first-order derivative (FD), Savitzky-Golay smoothing filtering(SG), standard normal variate transformation(SNV), multivariate scattering correction (MSC), and first-order derivative followed by SG filtering(FD_SG) transformations. Based on the successive projection algorithm (SPA), only five to nine selected characteristic bands out of 216 bands ranging from 350 nm to 2500 nm were extracted, reducing the band number by 95.8% to 97.7%, greatly reducing the redundancy of the spectrum. The partial least square regression (PLSR) model constructed based on the characteristic bands selected by SPA and the measured Ce element concentration showed that the determination coefficient(R²) and root mean square error(RMSE) of the modeling set were 0.88 and 363 × 10^–6, respectively, while those of the prediction set were 0.87 and 503 × 10^–6, respectively, indicating good stability and high precision of the model, which can be used as an estimation model for the Ce element concentration in the Maoniuping rare earth ore district.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100086"},"PeriodicalIF":0.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Yalguaraz prospect: a porphyry copper-type deposit related to the gondwanic magmatism in the Andes of Argentina","authors":"María Gabriela Torres ,&nbsp;Nora A. Rubinstein ,&nbsp;Anabel L.R. Gómez ,&nbsp;María Celeste D'Annunzio","doi":"10.1016/j.oreoa.2025.100084","DOIUrl":"10.1016/j.oreoa.2025.100084","url":null,"abstract":"<div><div>The Yalguaraz gondwanic porphyry-type deposit is located at the eastern margin of the Frontal Cordillera in the Andes of Argentina. In this deposit, two alteration-mineralization stages (early and late) were recognized. The early stage is linked to the intrusion of a dacitic porphyry that produced pervasive potassic alteration (biotite - K–feldspar - quartz - andalusite) along with EB, A, and B veins. Mineralization occurs mainly disseminated in the dacitic porphyry and minor in A and B veins and consists of pyrrhotite, chalcopyrite, pyrite, and minor molybdenite. The late stage led to pervasive phyllic alteration (sericite + quartz + pyrite ± chlorite ± rutile ± chalcopyrite) along <span>d</span>-type veinlets and subsequent tourmalinization. The presence of hypogenic pyrrhotite and the scarce magnetite could indicate that it would be genetically associated with reducing magmas although the lack of ilmenite series oxides in the precursor magmatic rocks suggest that the reducing character of the mineralizing magmas was acquired during the magma evolution. δ¹⁸O and the Pb isotopic composition of the mineralizing magma confirm continental crust assimilation processes in its genesis whereas whole rock geochemistry suggests the involvement of marine sediment which would support the change in the redox conditions of the magma precursor of the porphyry-type mineralization.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100084"},"PeriodicalIF":0.0,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization and identification of key process parameters for in-situ leaching of uranium in the Barun uranium deposit, China","authors":"Peng Qiao ,&nbsp;Yuanqing Fan ,&nbsp;Shengqing Xiong ,&nbsp;Liangquan Ge ,&nbsp;Yixuan Yao ,&nbsp;Ruyi Wang ,&nbsp;Hao Song ,&nbsp;Huijie Yu ,&nbsp;Xiaoping Ren ,&nbsp;Zengjie Gui","doi":"10.1016/j.oreoa.2025.100085","DOIUrl":"10.1016/j.oreoa.2025.100085","url":null,"abstract":"<div><div>Ascertaining the optimal process parameters for in-situ leaching (ISL) of uranium is crucial for maximizing both uranium leaching rates and enhancing the production efficiency of uranium mining endeavors. Nevertheless, limited research has been conducted on the chemical composition of uranium ore within the Barun uranium deposit, with a notable absence of indoor leaching experiments and in-depth discussions pertaining to the ISL technology for uranium and the identification of optimal leaching parameters tailored to this specific deposit. Therefore, the present study focuses on the analysis of uranium ore from the Barun uranium deposit, utilizing X-ray fluorescence spectrometry (XRF) and elemental chemical analysis. Furthermore, a series of experiments were conducted, encompassing acid consumption tests, acid concentration determination, and various oxidant leaching tests. The findings reveal that: (1) The uranium ore within the deposit is abundant in minerals that exhibit resistance to acid dissolution, notably quartz and silicates (with SiO₂ and Al₂O₃ contents reaching as high as 77.62 % and 15.65 %), whereas the content of minerals readily soluble under acidic conditions, such as carbonates, iron minerals, and sulfides, is relatively low (with the proportions of total carbon, total iron, and sulfur content being as low as 0.128 %, 0.881 %, and 0.26 %, respectively). The mineralogical attributes of this deposit suggest its suitability for the application of acid ISL. (2) During the acid leaching process of uranium ore, an optimal H₂SO₄ concentration of 5 g/L was observed to yield a superior uranium leaching rate of 78.76 %, accompanied by a reduced sulfuric acid consumption of 115.8 tons per ton of uranium extracted. Notably, the pH of the leaching solution remained largely unaffected by the oxidant utilized. Under the influence of 1.5 g/L of 30 % H₂O₂, the uranium leaching rate achieved its maximum value of 90.27 %, significantly outperforming other oxidant conditions. (3) The acid leaching methodology is a viable option for the ISL of uranium from the Barun deposit. It is advisable to employ a concentration of 5 g/L H₂SO₄ while maintaining the pH of the leaching solution below 2 for optimal performance. In response to the anticipated decrease in uranium concentration during the intermediate and later stages of the leaching process, the strategic addition of 1.5 g/L of 30 % H₂O₂ is recommended to facilitate the oxidative dissolution of tetravalent uranium minerals, thereby enhancing the overall leaching efficiency. This study offers significant insights and valuable references for future research on ISL of uranium in the Barun uranium deposit, as well as in other sandstone-hosted uranium deposits that possess comparable mineralogical characteristics.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100085"},"PeriodicalIF":0.0,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Source rock appraisal of Taqrifat Shale-Mallegh formation and the origin of crude oils of Cyrenaica region, NE Libya","authors":"Fares F. Fares,&nbsp;Farag M. El Oshebi","doi":"10.1016/j.oreoa.2025.100083","DOIUrl":"10.1016/j.oreoa.2025.100083","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The Cyrenaica consists of two main tectonic provinces that influence the area: the Cyrenaica Platform in the south and the Al Jabal Al Akhdar Uplift and Fold Belt in the north, and it is considered one of the smallest basins in Libya. The goal of this work is to attempt to correlate the geochemical characteristics of the source rocks with the samples of crude oils and infer their organic matter richness, thermal maturation, and depositional environment. The following four wells yielded samples of fifty-nine cutting samples of source rocks: nearly fifteen cutting samples from each well, Mallegh Formation in wells A1-NC120 and B1-NC152, whereas Taqrifat Shale in wells T1-41 and A1-46. Four crude oil samples were examined and subjected to Gas Chromatography-Mass Spectrometry (GC–MS) in this work: one sample of oil from each well, the Daryanah Formation in wells A1-NC120 and B1-NC152, and the Antenlat Formation in wells A1-46 and T1-41. Rock-Eval pyrolysis and GC–MS were utilized with these materials to determine the specific type of organic matter, thermal maturation, and depositional environment. The relationship between TOC and S&lt;sub&gt;2&lt;/sub&gt; showed the Mallegh Formation in wells A1-NC120 and B1-NC152 and Taqrifat Shale in well A1-46 had poor to fair organic matter, while the TOC of Taqrifat Shale in well T1-41 had good to excellent organic matter contents. TOC vs. S&lt;sub&gt;1&lt;/sub&gt;+S&lt;sub&gt;2&lt;/sub&gt; revealed the source rock of the Mallegh Formation in wells A1-NC120 and B1-NC152, and the source rock of the Taqrifat Shale Formation in well A1-46 was revealed as non-potential hydrocarbon, while the source rock of the Taqrifat Shale in well T1-41 showed potential hydrocarbon. TOC and S&lt;sub&gt;2&lt;/sub&gt; were used to identify the kerogen types, the Mallegh Formation in wells A1-NC120 and B1-NC152 and Taqrifat Shale in well A1-46, represented by two types of kerogen (III and IV), while Taqrifat Shale in well T1-41 is represented by three types of kerogen (II/III, III, and IV). The ratio of CPI vs. Pr/Ph and Pr/Ph vs. C&lt;sub&gt;31&lt;/sub&gt; 22S/(22S+22R) revealed that the oil samples from the Antenlat Formation in wells A1-46 and T1-41 and the oil sample from the Daryanah Formation in well B1-NC152 were deposited in a marine environment under oxidizing conditions, whereas the oil sample from the Daryanah Formation in well A1-NC120 was deposited in a marine environment under an anoxic condition. Based on the plot of Ph/n-C&lt;sub&gt;18&lt;/sub&gt; vs. Pr/n-C&lt;sub&gt;17&lt;/sub&gt; for the origin of organic matter in oil samples, the organic matter from the oil sample of the Daryanah Formation in well A1-NC120 was derived from algal marine type, and the oil samples from the Daryanah Formation in well B1-NC152 and the oil samples from the Antenlat Formation in wells T1-41 and A1-46 were derived from mixed organic matter (marine type and terrestrial type). According to organic matter type and thermal maturity level for the source rock samples and oil sample results, the source rock of the M","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100083"},"PeriodicalIF":0.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trace element composition and significance of quartz and stibnite in the Woxi Au - Sb - W deposit, Hunan","authors":"Jiankang Zhang,&nbsp;Yulong Yang,&nbsp;Qiang Wang,&nbsp;Huimin Zhang,&nbsp;Feilin Zhu","doi":"10.1016/j.oreoa.2024.100082","DOIUrl":"10.1016/j.oreoa.2024.100082","url":null,"abstract":"<div><div>We present new mineralogical and chemical data on quartz and stibnite from the Woxi Au-Sb-W deposit in western Hunan. The aim is to elucidate the substitution mechanisms of trace elements and to estimate the ore-forming temperatures within the Woxi deposit. Furthermore, we explore the potential of using trace element compositions in quartz to differentiate between various types of mineral deposits. Based on field investigation and petrographic observation, the mineralization process of the Woxi deposit can be divided into three distinct stages: an early quartz-scheelite stage, a main quartz-sulfide-native gold stage, and a late quartz-carbonate stage. LA-ICP-MS analysis of quartz from different mineralization stages reveals distinct substitution mechanisms for trace elements. In the early-stage quartz, the primary substitution mechanism is (Al³⁺, As³⁺) + (Li⁺, Na⁺) → Si⁴⁺. In the main stage, the substitution mechanism is 2(Sb³⁺, As³⁺) + (Ba²⁺) → 2Si⁴⁺. For the late-stage quartz, the substitution follows the pattern 2(As³⁺, Sb³⁺) + (Ba²⁺, Sr²⁺) → 2Si⁴⁺. Stibnite occurs exclusively during the second stage, with Cu and Pb enrichment in stibnite facilitated by the substitution mechanism of Cu²⁺ + Pb²⁺ → Sb³⁺. The incorporation of As into stibnite is attributed to a substitution equation of Sb³⁺ ↔ As³⁺. Quartz crystallization temperatures inferred from Ti thermometry suggest that quartz crystallization temperatures across different stages to be relatively similar. The temperature obtained through the titanium-in-quartz thermometer likely reflects the crystallization temperature of quartz. Since quartz crystallizes at relatively higher temperatures, the calculated temperature is higher than that indicated by fluid inclusion thermometry. Additionally, by compiling geochemical data from nine different types of Au, Sb, and W deposits and conducting plotting analysis, it was observed that orogenic deposits exhibit relatively balanced Ti, Al, and Ge concentrations, with a relative enrichment of Ge. Epithermal deposits show higher Ti concentrations but lower Al and Ge, with most data points concentrated in the high Ti range. In contrast, porphyry deposits are characterized by higher Al content and lower Ti and Ge. The ternary discrimination diagram of Ti, Al, and Ge effectively distinguishes the quartz characteristics of orogenic, epithermal, and porphyry-type deposits.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100082"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Age, depositional environment, and hydrocarbon potential of the Bonalea strata in the northern Douala basin, SW Cameroon: An integrated organic and mineralogical approach","authors":"André Mbabi Bitchong ,&nbsp;Glwadys Ngo Mandeng ,&nbsp;Serge P. Koah Na Lebogo ,&nbsp;Serge Alberto Bitjong ,&nbsp;Soukaina Obad ,&nbsp;Cecile Olive Mbesse ,&nbsp;Simon Ngos III ,&nbsp;Thierry Adatte","doi":"10.1016/j.oreoa.2024.100080","DOIUrl":"10.1016/j.oreoa.2024.100080","url":null,"abstract":"<div><div>This study uses the lithofacies analysis, palynology and palynofacies, as well as bulk organic geochemical by Rock-Eval analysis, and mineralogical analysis to date and assess the hydrocarbon potential, maturity, and depositional environment characteristics of the strata from the Bonalea area in the northern part of the Douala sub-basin. The sediments are palynomorph-poor silts/sandstones, with key palynomorph species (e.g., <em>Longapertites</em> sp., <em>Cyathidites</em> sp., <em>Laevigatosporites</em> sp., <em>Echitriporites trianguliformis, Retitriporites</em> sp., <em>Monocolpopollenites</em> sp. and <em>Psilatriletes</em> sp.) indicative of the Paleocene-Eocene N'kapa Formation. These materials exhibit weak to moderate compaction and are distinguished by the predominance of detrital minerals such as quartz, kaolinite, smectite, and illite, as well as the initial phase of chloritization of illite and weak thermal alteration index (TAI) values, indicating the thermal immaturity of the deposits. The present-day high total organic carbon (TOC) contents (3.79–13.20 %), associated with high hydrogen index (HI: 594–796 mg HC/g TOC), S1 (1.91–24.23 mg HC/g rock) and production index (PI: 0.07–0.24) values, as well as low Tmax values and the existence of significant S1 peaks and asymmetric S2 peaks, reveal natural contamination of these deposits by migrated oils. These oils impregnate the rocks, resulting in stains with jellified aspect that may be misinterpreted as amorphous organic matter (AOM), leading to incorrect interpretations. Based on the combination of silty-sandy characters of the deposits, relative abundance of phytoclasts and presence of <em>Botryococcus braunii</em>, the paleodepositional environment appears to be a proximal continental shelf environment in which deposition would have occurred following the channel-bank collapse under well-oxygenated conditions, with slumped bank materials transitioning from landslip masses to sediment-gravity flows. Therefore, the Bonalea deposits, which are affected by the movement of oils from external sources and have the potential to be a full reservoir, could be a promising option for future petroleum exploration in the Douala sub-basin.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100080"},"PeriodicalIF":0.0,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemical properties and mineralization of thorium","authors":"Jie Li ,&nbsp;Tianhui Bai ,&nbsp;Wenxuan Hu ,&nbsp;Meiyun Wang ,&nbsp;Lei Liao ,&nbsp;Zhifeng Xun ,&nbsp;Zexin Wang ,&nbsp;Hao Song","doi":"10.1016/j.oreoa.2024.100081","DOIUrl":"10.1016/j.oreoa.2024.100081","url":null,"abstract":"<div><div>Thorium, a naturally occurring radioactive element, is widely distributed across diverse geological environments. As a typical lithophilic element, thorium exhibits strong affinity towards oxygen, readily integrating into silicate melts, primarily concentrating in the lithosphere. During the magmatic phase, thorium's geochemical behavior is akin to that of U, Ce, and Zr, and as an incompatible element, it remains in the residual melts of the latter stages of magmatic evolution. Thorium is enriched in acidic, pegmatitic, and alkaline rocks, leading to the formation of thorium-bearing phosphate minerals such as monazite. Alkaline carbonatitic fluids are capable of enriching rare earth elements and thorium, closely associating thorium deposits with igneous carbonatites. In surface processes, thorium's geochemical properties are relatively inert, allowing it to be preserved within the stable lattice of thorium-bearing minerals and form placer deposits. Globally, thorium resources are primarily found in carbonatite rocks, placer, and vein deposits, with monazite being one of the main sources. According to a report jointly published by the International Atomic Energy Agency and the Nuclear Energy Agency, the global thorium resources currently exceed 6.3 million tons, predominantly distributed in countries like India, Brazil, Australia, and the United States. The mineralization period of thorium is mainly concentrated in the Precambrian and Mesozoic, followed by the Paleozoic and Cenozoic. In China, thorium resources are relatively abundant, mostly associated with rare earth element deposits, yet their utilization rate remains low due to factors such as sorting technology. Thorium is a vital raw material in the space technology industry and a significant future nuclear fuel; thus, rational development and strategic protection of thorium resources should be strengthened, along with appropriate strategic reserves.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100081"},"PeriodicalIF":0.0,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the genesis of carbonate cements in tight and non-tight sandstone reservoirs in Fukang Sag","authors":"Li Na ,&nbsp;Wang Zi'ang ,&nbsp;Liu Gang ,&nbsp;Wang Guozhi ,&nbsp;Huang Sheng ,&nbsp;Liu Jinlong ,&nbsp;Jing Yang ,&nbsp;Chen Haixia","doi":"10.1016/j.oreoa.2024.100079","DOIUrl":"10.1016/j.oreoa.2024.100079","url":null,"abstract":"<div><div>Carbonate cements characterization and reservoir genesis mechanism are the key geological issues constraining the current deep oil and gas exploration. The relationship between carbonate cementation and oil and gas filling time can affect reservoir reserves. In this paper, the tight and non-tight sandstone reservoirs of the Middle Jurassic in Fukang Sag of Junggar Basin are taken as the research object. The petrology, sedimentary microfacies, diagenesis, porosity and carbonate cements of tight and non-tight reservoirs are compared by means of casting thin sections, scanning electron microscope (SEM) and carbon and oxygen isotopes. The research shows that the tight reservoirs and non-tight reservoirs of deep sandstone in Fukang sag are similar in rock type and sedimentary microfacies, they are all feldspar lithic sandstone. The reservoirs are mainly developed in underwater distributary channels and estuary sand dams. There are obvious differences in the strength of compaction and pore types. Although they all contain carbonate cements, their genesis and formation time are obviously different. The results show that the carbonate cements in the non-tight sandstone reservoirs of the Toutunhe Formation are mainly of Microbial sulfate reduction (BSR) origin, which are formed in the process of reservoir failure. The formation of carbonate mineral cements in tight sandstone reservoirs of the Badaowan Formation and Sangonghe Formation is mainly related to the decarboxylation of organic acids, which are mainly formed in the process of hydrocarbon accumulation. The research in this paper can provide theoretical guidance for exploration and development in the future of the 4th Block of central Junggar Basin and similar research areas.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100079"},"PeriodicalIF":0.0,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production indication curve of fracture-cave units in carbonate reservoirs","authors":"Yuanyuan Tian ,&nbsp;Changhui Yan ,&nbsp;Hong Cheng ,&nbsp;Jing Xue ,&nbsp;Xindan Zhou","doi":"10.1016/j.oreoa.2024.100078","DOIUrl":"10.1016/j.oreoa.2024.100078","url":null,"abstract":"<div><div>Determining the production performance of fracture-cave carbonate reservoirs is difficult because of the heterogeneous properties of these reservoirs and various production performance levels. Also, data series such as formation pressure and conductivity of fractures are hard to obtain. Thus, common methods, such as the IPR (inflow performance relationship) and water flooding curves, are often ineffective for analyzing of carbonate reservoirs. We propose a new method to analyze the production performance of fracture-cave carbonate reservoirs based on a fracture-cave model delineated by well log and seismic interpretation data, referred to as, the production indication curve. In essence, the production indication curve represents the relationship between flowing bottomhole pressure and accumulated liquid rate, and recoverable reserves can be estimated via the equation of the production indication curve. And it was validated by experiment method which revealed that recoverable reserves calculated by production indication equation was credible. With the production indication curve, recoverable reserve of typical well was estimated, and the results revealed that the proposed production indication curve technique is a dependable method for the characterization of the production performance of fracture-cave carbonate reservoirs.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100078"},"PeriodicalIF":0.0,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemical assessment and transfer of potential effects of metallic trace elements around abandoned mining sites in Kettara region (Morocco)","authors":"Lahcen Zouhri ,&nbsp;Khalid El Amari ,&nbsp;Mohamed Hibti ,&nbsp;Abdelfattah Benkaddour ,&nbsp;Adel Zghibi","doi":"10.1016/j.oreoa.2024.100076","DOIUrl":"10.1016/j.oreoa.2024.100076","url":null,"abstract":"<div><div>The degradation of environmental quality due to pollution is a pressing concern worldwide, particularly in areas that have been abandoned after mining activities. One significant aspect of this degradation is the contamination of soil and water resources by Metallic Trace Elements (MTE). These elements, originating from mining operations, pose serious environmental and human health risks, necessitating urgent attention and remediation efforts. Understanding the characteristics and extent of MTE contamination in abandoned mining areas is crucial for effective environmental management and sustainable development. In this context, this study aims to investigate the patterns, distribution, and impacts of MTE contamination in soil and water resources within Kettara abandoned mining areas (Morocco), offering insights into potential mitigation strategies and policy interventions to address this critical environmental issue. Stream and groundwater samples were collected in the Kettara region where the abandoned tailings constitute with Acid Mine Drainage (AMD), the principal source of this contamination. Stream samples were collected in 2018 at fourteen points near sixteen hydrogeological wells and situated at different distance from the pollution source.</div><div>This study addresses an environmental concern, focusing on the dispersion of MTE such as Arsenic, Zinc, and Nickel in both streams and groundwater. Through geochemical analysis, it is revealed that Arsenic is particularly prevalent, with higher concentrations detected in streams, especially those proximate to mining waste sites. The main sampling water near the abandoned mine shows several anomalies (As, Ni and Zn). The higher As concentration in the stream samples E1 and E2 with 179.55 and 96.63 ppm and near the mine wastes. The concentration of As is also higer in the water samples especially in the hydrogeological well P21 and P2 with 9.665 and 7.798 ppm.</div><div>The presence of MTE in groundwater is linked to various factors, including the direction of flow (vertical or lateral) from soil to groundwater and the hydraulic conditions (presence of the drainage axis that is materialized by the convergence of the groundwater flow from the upstream to the downstream, generally from the hydrogeological wells P1 to P23). The hydraulic relationship between streams and groundwater, hydrogeological properties such as aquifer porpermeability (vertical scale 2.5 × 10^–14 to 1.31 × 10^–12 m/s and horizontal scale 9 × 10^–14 to 0.37 × 10^–9 m/s) and transmissivity (about 10⁻² m²/s), and the configuration of the piezometric geometry (including the presence of drainage axes and divisional boundaries within the Ketarra groundwater) are factors that contribute to the mobility and distribution of MTE within the water resources of the Kettara basin.</div></div>","PeriodicalId":100993,"journal":{"name":"Ore and Energy Resource Geology","volume":"18 ","pages":"Article 100076"},"PeriodicalIF":0.0,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}