3D high-precision tunnel gravity exploration theory and its application for concealed inclined high-density ore deposits

Ren, Han; Wen-yao, LI; Cheng, Ruihong; Wang, Feng; Yan, Zhaokun

doi:10.1016/j.jappgeo.2020.104119

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…Moreover, localising large features relative to the tunnel (i.e., in front, behind, left, right) is further complicated by the structure's cylindrical profile. This makes modelling the corresponding gravity field a multi-solution problem, introducing significant uncertainty and greatly increasing involved computation efforts [69].…”

Section: Gravity Methodsmentioning

confidence: 99%

Developments in 3D Visualisation of the Rail Tunnel Subsurface for Inspection and Monitoring

2022

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Railway Tunnel SubSurface Inspection (RTSSI) is essential for targeted structural maintenance. ‘Effective’ detection, localisation and characterisation of fully concealed features (i.e., assets, defects) is the primary challenge faced by RTSSI engineers, particularly in historic masonry tunnels. Clear conveyance and communication of gathered information to end-users poses the less frequently considered secondary challenge. The purpose of this review is to establish the current state of the art in RTSSI data acquisition and information conveyance schemes, in turn formalising exactly what constitutes an ‘effective’ RTSSI visualisation framework. From this knowledge gaps, trends in leading RTSSI research and opportunities for future development are explored. Literary analysis of over 300 resources (identified using the 360-degree search method) informs data acquisition system operation principles, common strengths and limitations, alongside leading studies and commercial tools. Similar rigor is adopted to appraise leading information conveyance schemes. This provides a comprehensive whilst critical review of present research and future development opportunities within the field. This review highlights common shortcomings shared by multiple methods for RTSSI, which are used to formulate robust criteria for a contextually ‘effective’ visualisation framework. Although no current process is deemed fully effective; a feasible hybridised framework capable of meeting all stipulated criteria is proposed based on identified future research avenues. Scope for novel analysis of helical point cloud subsurface datasets obtained by a new rotating ground penetrating radar antenna is of notable interest.

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Section: Gravity Methodsmentioning

confidence: 99%

Developments in 3D Visualisation of the Rail Tunnel Subsurface for Inspection and Monitoring

2022

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“…The prospecting methods associated with the Huizestyle deposits are different from those of typical MVT Pb-Zn deposits. Tectonic ore-control exploration techniques dominate the prospecting exploration of Huize-style deposits, such as orefield structural analysis (Wang et al, 2020), tectono-geochemical exploration (Han et al, 2015), tectonic-altered rock facies measurements (Han, 2017;Wang et al, 2019), tunnel gravity exploration (Han et al, 2020), and electromagnetic detection (Han et al, 2019a). However, combinations of strata and lithology, with certain exploration techniques, such as orebearing sedimentary facies analysis, basin structure analysis, and geochemical exploration, dominate explorations of classic MVT deposits.…”

Section: Classification Of Deposit Type and Its Significancementioning

confidence: 99%

Geology and geochemistry of Zn-Pb(-Ge-Ag) deposits in the Sichuan-Yunnan-Guizhou Triangle area, China: A review and a new type

et al. 2023

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Mississippi Valley Type (MVT)1 deposits represent the majority of carbonate-hosted Zn–Pb deposits globally. They typically form in an extensional tectonic setting along passive margins. However, studies on carbonate-hosted Zn–Pb deposits in the Sichuan–Yunnan–Guizhou Triangle area (SYGT) reveal differences in terms of the essential features of typical MVT deposits. We discuss the main features of these deposits, controlled by folds and faults, high-grade Zn–Pb ores and symbiotic or associated elements (i.e., abundant Ag and dispersed amounts of Ge, Ga, and Cd) of significant economic value. Based on a comparison of Pb-Zn deposits in SYGT and classical MVT deposits formed in an extensional tectonic setting, as well as a subsequent discussion on deposit classification, we propose that the Huize-style Zn–Pb deposits are a new deposit style, whose basic features can guide future ore exploration. We define the Huize-style deposits based on four factors: i) Hierarchical ore-controlling system of strike-slip fault-fold structures, ii) litho-facies associated with typical alternation and mineralisation, iii) ore-forming geochemical features revealed by typical mineral assemblages, mineralisation alteration zoning, fluid-inclusion, isotope geochemistry and metallogenic acid–alkali geochemical barriers, and iv) different prospecting methods to those typically used for MVT deposits. The Huize-style and typical MVT deposits constitute the carbonate-hosted non-magmatic epigenetic hydrothermal-type (CNHT) Zn–Pb deposits.

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“…The tunnel gravity detection method has substantially enriched and extended new geophysical methods (Han et al, 2014;Li and Han, 2014). In particular, Han et al (2014) reported the successful application of deep ore prospecting in Maoping and Huize lead-zinc mines, thereby elucidating the spatial positioning of high-density inclined concealed orebodies (Han et al, 2014;Zhang, 2017;Han et al, 2020a;Han et al, 2021).However, the scales and trends of deep orebodies vary widely, and there has been no qualitative or quantitative research on vertical concealed orebodies. Considering the principles of full-space positioning and tunnel gravity detection methods, this study proposed the principles of spatial positioning of vertical high-density concealed orebodies.…”

Section: Introductionmentioning

confidence: 99%

Principles and application of tunnel gravity full-space positioning and detection method for deep high-density vertical orebodies

Wang

Ren²,

Li³

et al. 2022

Front. Earth Sci.

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Considering the needs of current deep mineral exploration and development, the tunnel gravity exploration method is advantageous, as it is unaffected by electromagnetic interference, is hardly affected by terrain, has a high detection accuracy, and overcomes the multi-solution problem of geophysical anomalies. Herein, to systematically explain the distribution law and principle of the tunnel gravity method in spatial position prediction, a systematic study was performed on upright orebodies, and 18 types of positive and negative combination rules of spatial distribution anomalies are proposed. The method is used for the detection of concealed ore in the deep part of the Huangshaping skarn-type deposit in southern Hunan, China, and accurate results are obtained. The results indicate that tunnel gravity exploration solves the problem of orebodies located in the deep parts of a high-density vertical orebody when a single tunnel or multiple tunnels are detected. This study not only extends the theory and method of tunnel gravity exploration but also provides an important basis for the layout of deep exploration projects.

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3D high-precision tunnel gravity exploration theory and its application for concealed inclined high-density ore deposits

Cited by 6 publications

References 11 publications

Developments in 3D Visualisation of the Rail Tunnel Subsurface for Inspection and Monitoring

Developments in 3D Visualisation of the Rail Tunnel Subsurface for Inspection and Monitoring

Geology and geochemistry of Zn-Pb(-Ge-Ag) deposits in the Sichuan-Yunnan-Guizhou Triangle area, China: A review and a new type

Principles and application of tunnel gravity full-space positioning and detection method for deep high-density vertical orebodies

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