Application of Remote Sensing to Geobotany to Detect Hydrothermal Alteration Facies in Epithermal High-Sulfidation Gold Deposits in the Amazon Region

2009 ◽  
pp. 135-142
Keyword(s):  
Remote Sensing ◽  
Hydrothermal Alteration ◽  
Gold Deposits ◽  
Amazon Region ◽  
High Sulfidation

Hydrothermal alteration and structural mapping of the Qolqoleh-Kasnazan shear zone in Iran using remote sensing data

2021 ◽  
Vol 14 (16) ◽  
Author(s):  
Mehdi Maleki ◽  
Shojaeddin Niroomand ◽  
Ehsan Farahbakhsh ◽  
Soroush Modabberi ◽  
Hossein Ali Tajeddin
Keyword(s):  
Remote Sensing ◽  
Shear Zone ◽  
Hydrothermal Alteration ◽  
Remote Sensing Data ◽  
Structural Mapping ◽  
Sensing Data

scholarly journals Information and computational GIS for monitoring the natural and technical systems of placer gold deposits

2021 ◽  
Vol 895 (1) ◽  
pp. 012036
Author(s):  
V I Usikov ◽  
Y A Ozaryan
Keyword(s):  
Remote Sensing ◽  
Information Technologies ◽  
Precious Metals ◽  
Gold Deposits ◽  
Raw Material ◽  
Expert Assessment ◽  
Labor Costs ◽  
Resource Base ◽  
Placer Gold ◽  
Geological Information

Abstract It is known that nowadays one of the main problems of mining is the depletion of reserves. The researchers consider mining waste as a source of replenishment of the resource base. Disputes on the prospects for technogenic raw material processing are becoming especially relevant. The object of research chosen by the authors in this article is the technogenic neoplasms resulting from dredging and hydraulic processing of placer gold. The paper presents the results of assessing the prospects and application of the information technologies, in particular, the analysis of data from remote sensing of the Earth in the design and organization of work to involve technogenic placers in operation. It is shown that these technologies are able to increase the efficiency of work and reduce labor costs at the stage of preliminary study of potential development targets. Technogenic complexes of depleted fields are a significant reserve of the mineral resource base of gold and other precious metals. This paper presents the results of the creation of a method for expert assessment of spatial and volumetric indicators of technogenic complexes of alluvial fields and other landscape objects using remote sensing of the territory and analysis of geological information. The Kerbinsky gold-bearing region of the Khabarovsk Region was chosen as the object of research.

scholarly journals Integrated Hyperspectral and Geochemical Study of Sediment-Hosted Disseminated Gold at the Goldstrike District, Utah

2019 ◽  
Vol 11 (17) ◽  
pp. 1987 ◽  
Author(s):  
Lei Sun ◽  
Shuhab Khan ◽  
Peter Shabestari
Keyword(s):  
Remote Sensing ◽  
Hyperspectral Imaging ◽  
Gold Mineralization ◽  
Pyrite Oxidation ◽  
Gold Deposits ◽  
Remote Sensing Technique ◽  
Geochemical Study ◽  
Resource Exploration ◽  
Ore Grades ◽  
Siliciclastic Rocks

The Goldstrike district in southwest Utah is similar to Carlin-type gold deposits in Nevada that are characterized by sediment-hosted disseminated gold. Suitable structural and stratigraphic conditions facilitated precipitation of gold in arsenian pyrite grains from ascending gold-bearing fluids. This study used ground-based hyperspectral imaging to study a core drilled in the Goldstrike district covering the basal Claron Formation and Callville Limestone. Spectral modeling of absorptions at 2340, 2200, and 500 nm allowed the extraction of calcite, clay minerals, and ferric iron abundances and identification of lithology. This study integrated remote sensing and geochemistry data and identified an optimum stratigraphic combination of limestone above and siliciclastic rocks below in the basal Claron Formation, as well as decarbonatization, argillization, and pyrite oxidation in the Callville Limestone, that are related with gold mineralization. This study shows an example of utilizing ground-based hyperspectral imaging in geological characterization, which can be broadly applied in the determination of mining interests and classification of ore grades. The utilization of this new terrestrial remote sensing technique has great potentials in resource exploration and exploitation.

scholarly journals Remote sensing of surface Hydrothermal Alteration, identification of Minerals and Thermal anomalies at Sveifluháls-Krýsuvík high-temperature Geothermal field, SW Iceland

2019 ◽  
Vol 254 ◽  
pp. 012005
Author(s):  
Lucía Magali Ramírez-González ◽  
Muhammad Aufaristama ◽  
Ingibjörg Jónsdóttir ◽  
Ármann Höskuldsson ◽  
þorvaldur þórðarson ◽  
...  
Keyword(s):  
Remote Sensing ◽  
High Temperature ◽  
Hydrothermal Alteration ◽  
Geothermal Field ◽  
Thermal Anomalies

scholarly journals A Remote Sensing-Based Application of Bayesian Networks for Epithermal Gold Potential Mapping in Ahar-Arasbaran Area, NW Iran

2019 ◽  
Vol 12 (1) ◽  
pp. 105 ◽  
Author(s):  
Seyed Mohammad Bolouki ◽  
Hamid Reza Ramazi ◽  
Abbas Maghsoudi ◽  
Amin Beiranvand Pour ◽  
Ghahraman Sohrabi
Keyword(s):  
Remote Sensing ◽  
Bayesian Network ◽  
Hydrothermal Alteration ◽  
Gold Mineralization ◽  
Epithermal Gold ◽  
Alteration Zones ◽  
Mineral Potential ◽  
Potential Map ◽  
Bayesian Network Classifier ◽  
Hydrothermal Alteration Zones

Mapping hydrothermal alteration minerals using multispectral remote sensing satellite imagery provides vital information for the exploration of porphyry and epithermal ore mineralizations. The Ahar-Arasbaran region, NW Iran, contains a variety of porphyry, skarn and epithermal ore deposits. Gold mineralization occurs in the form of epithermal veins and veinlets, which is associated with hydrothermal alteration zones. Thus, the identification of hydrothermal alteration zones is one of the key indicators for targeting new prospective zones of epithermal gold mineralization in the Ahar-Arasbaran region. In this study, Landsat Enhanced Thematic Mapper+ (Landsat-7 ETM+), Landsat-8 and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) multispectral remote sensing datasets were processed to detect hydrothermal alteration zones associated with epithermal gold mineralization in the Ahar-Arasbaran region. Band ratio techniques and principal component analysis (PCA) were applied on Landsat-7 ETM+ and Landsat-8 data to map hydrothermal alteration zones. Advanced argillic, argillic-phyllic, propylitic and hydrous silica alteration zones were detected and discriminated by implementing band ratio, relative absorption band depth (RBD) and selective PCA to ASTER data. Subsequently, the Bayesian network classifier was used to synthesize the thematic layers of hydrothermal alteration zones. A mineral potential map was generated by the Bayesian network classifier, which shows several new prospective zones of epithermal gold mineralization in the Ahar-Arasbaran region. Besides, comprehensive field surveying and laboratory analysis were conducted to verify the remote sensing results and mineral potential map produced by the Bayesian network classifier. A good rate of agreement with field and laboratory data is achieved for remote sensing results and consequential mineral potential map. It is recommended that the Bayesian network classifier can be broadly used as a valuable model for fusing multi-sensor remote sensing results to generate mineral potential map for reconnaissance stages of epithermal gold exploration in the Ahar-Arasbaran region and other analogous metallogenic provinces around the world.

scholarly journals Research on Hyperspectral Identification of Altered Minerals in Yemaquan West Gold Field, Xinjiang

2019 ◽  
Vol 11 (2) ◽  
pp. 428 ◽  
Author(s):  
Ziwu Pan ◽  
Junjie Liu ◽  
Liqun Ma ◽  
Fengrui Chen ◽  
Guchang Zhu ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Mineral Assemblage ◽  
Shear Zones ◽  
Gold Deposits ◽  
Mineral Extraction ◽  
Mineral Mapping ◽  
Geological Characteristics ◽  
Field Verification ◽  
Gold Silver ◽  
Ground Conditions

Predictions of prospectivity based on remote sensing were developed using alteration mineral indicative hyperspectral mapping and remote sensing anomaly filtering, combined with geological characteristics and anomalous mineral field verification. Based on the results of the hyperspectral mineral mapping and the actual geological ground conditions, the results of mapping of altered minerals, such as chlorite, muscovite, kaolinite, and iron oxide were validated, and gold, silver, copper, nickel, and other geochemical anomaly areas were identified for verification work. The results of hyperspectral mineral extraction show that the mineral assemblage closely related to gold deposits in shear zones is muscovite + chlorite + epidote + kaolinite. This alteration mineral assemblage can be used as regional search criteria for shear zone gold mineralisation and was the basis for the discovery of mineralised hydrothermal alteration centres and delineation of four prospective targets. Established on a spectral prospectivity model of the study area, prospective ore-bearing areas have been delineated, which indicate the direction for further geological and mineral resource surveys.

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