6 research outputs found

    Global and local characterization of rock classification by Gabor and DCT filters with a color texture descriptor

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    In the automatic classification of colored natural textures, the idea of proposing methods that reflect human perception arouses the enthusiasm of researchers in the field of image processing and computer vision. Therefore, the color space and the methods of analysis of color and texture, must be discriminating to correspond to the human vision. Rock images are a typical example of natural images and their analysis is of major importance in the rock industry. In this paper, we combine the statistical (Local Binary Pattern (LBP) with Hue Saturation Value (HSV) and Red Green Blue (RGB) color spaces fusion) and frequency (Gabor filter and Discrete Cosine Transform (DCT)) descriptors named respectively Gabor Adjacent Local Binary Pattern Color Space Fusion (G-ALBPCSF) and DCT Adjacent Local Binary Pattern Color Space Fusion (D-ALBPCSF) for the extraction of visual textural and colorimetric features from direct view images of rocks. The textural images from the two G-ALBPCSF and D-ALBPCSF approaches are evaluated through similarity metrics such as Chi2 and the intersection of histograms that we have adapted to color histograms. The results obtained allowed us to highlight the discrimination of the rock classes. The proposed extraction method provides better classification results for various direct view rock texture images. Then it is validated by a confusion matrix giving a low error rate of 0.8% of classification

    Evaluations Gîtologique et Environnementale des Activités Minières Artisanales Liées à l'Or de Doumbiadougou, Duékoué, Ouest de la Côte d'Ivoire

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    La présente étude évalue les connaissances gîtologiques et les impacts environnementaux liés aux activités artisanales de prospection et d’exploitation d’or de Doumbiadougou, département de Duékoué, ouest de la Côte d’Ivoire. L’étude s’appuie sur des données issues de la description in situ des puits de prospection, des carrières ainsi que des méthodes de récupération de l’or et de l’environnement. La typologie des gîtes indique deux ensembles à Doumbiadougou : d’une part les gîtes alluvionnaires dans les bas-fonds et d’autre part les gîtes filoniens sur les collines environnantes. Leur prospection s’effectue par le fonçage de puits tests de 1m3 jusqu’à 16m3 dans les bas-fonds, également sur les pentes et autour des veines de quartz sur les collines. L’exploitation des gîtes alluvionnaires se fait par l’ouverture de carrières de 5 m x 2 m x 2 m soit 20 m3 tandis que ceux filoniens se fait par l’ouverture de puits de 80 cm de diamètre et de profondeur allant jusqu’à 25 m. Le minerai alluvionnaire est traité par les lavages à la batée ou au sluice tandis que celui des filons est pulvérisé avant de subir le même traitement. La production aurifère se termine par la récupération de l’or après amalgamation au mercure. Sur le volet environnemental, ces méthodes laissent des puits béants, détruisent les cultures tout en réduisant les espaces cultivables, accélèrent le drainage minier acide, réactivent les conflits fonciers et exposent les communautés locales à l’inhalation du mercure. This study assesses the geological knowledge as well as the environmental impacts of artisanal gold mining activities at Doumbiadougou, Côte d'Ivoire. The study is based on data from in situ descriptions of exploration wells, quarries, and gold recovery methods. Ore typology indicates two sets: the alluvial in the shallows and filonian on the surrounding hills. Their prospection is carried out by test wells of 1m3 up to 16m3 in the shallows, also on the slopes and around the quartz veins on the hills. The exploitation of alluvial deposits is done by the quarries of 5 m x 2 m x 2 m or 20 m3 while those filonian is done through wells of 80 cm in diameter and depth up to 25 m. The alluvial ore is treated by washing by women or sluice while that of the veins is sprayed before undergoing the same treatment. Gold production is finally recovered after amalgamation with mercury. On the environmental side, these methods leave gaping wells, destroy crops while reducing arable land, accelerate acid mine drainage, reactivate land conflicts, and expose local communities to mercury inhalation

    Evaluations Gitologique et Environnementale des Activites Minieres Artisanales Liees a L’or de Doumbiadougou, Duekoue, Ouest de la Cote d’Ivore

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    La prĂ©sente Ă©tude Ă©value les connaissances gĂ®tologiques ainsi que les impacts environnementaux liĂ©s aux activitĂ©s aurifères artisanales pour l’or de Doumbiadougou en CĂ´te d’Ivoire. L’étude s’appuie sur des donnĂ©es issues de la description in situ des puits de prospection, des carrières ainsi que des mĂ©thodes de rĂ©cupĂ©ration de l’or. La typologie des gĂ®tes indique deux ensembles Ă  Doumbiadougou : d’une part les gĂ®tes alluvionnaires dans les bas-fonds et d’autre part les gĂ®tes filoniens sur les collines environnantes. Leur prospection s’effectue par le fonçage de puits tests de 1m3 jusqu’à 16m3 dans les bas-fonds, Ă©galement sur les pentes et autour des veines de quartz sur les collines. L’exploitation des gĂ®tes alluvionnaires se fait par l’ouverture de carrières de 5 m x 2 m x 2 m soit 20 m3 tandis que ceux filoniens se fait par l’ouverture de puits de 80 cm de diamètre et de profondeur allant jusqu’à 25 m. Le minerai alluvionnaire est traitĂ© par les lavages Ă  la batĂ©e ou au sluice tandis que celui des filons est pulvĂ©risĂ© avant de subir le mĂŞme traitement. La production aurifère se termine par la rĂ©cupĂ©ration de l’or après amalgamation au mercure. Sur le volet environnemental, ces mĂ©thodes laissent des puits bĂ©ants, dĂ©truisent les cultures tout en rĂ©duisant les espaces cultivables, accĂ©lèrent le drainage minier acide, rĂ©activent les conflits fonciers et exposent les communautĂ©s locales Ă  l’inhalation du mercure.   This study assesses the geological knowledge as well as the environmental impacts of artisanal gold mining activities at Doumbiadougou, CĂ´te d'Ivoire. The study is based on data from in situ description of exploration wells, quarries and gold recovery methods. Ore typology indicates two sets: the alluvial in the shallows and filonian on the surrounding hills. Their prospection is carried out by test wells of 1m3 up to 16m3 in the shallows, also on the slopes and around the quartz veins on the hills. The exploitation of alluvial deposits is done by the quarries of 5 m x 2 m x 2 m or 20 m3 while those filonian is done through wells of 80 cm in diameter and depth up to 25 m. The alluvial ore is treated by washing by women or sluice while that of the veins is sprayed before undergoing the same treatment. Gold production is finally recovered after amalgamation with mercury. On the environmental side, these methods leave gaping wells, destroy crops while reducing arable land, accelerate acid mine drainage, reactivate land conflicts and expose local communities to mercury inhalation

    Evaluations Gitologique et Environnementale des Activites Minieres Artisanales Liees a L’or de Doumbiadougou, Duekoue, Ouest de la Cote d’Ivore

    Get PDF
    La prĂ©sente Ă©tude Ă©value les connaissances gĂ®tologiques ainsi que les impacts environnementaux liĂ©s aux activitĂ©s aurifères artisanales pour l’or de Doumbiadougou en CĂ´te d’Ivoire. L’étude s’appuie sur des donnĂ©es issues de la description in situ des puits de prospection, des carrières ainsi que des mĂ©thodes de rĂ©cupĂ©ration de l’or. La typologie des gĂ®tes indique deux ensembles Ă  Doumbiadougou : d’une part les gĂ®tes alluvionnaires dans les bas-fonds et d’autre part les gĂ®tes filoniens sur les collines environnantes. Leur prospection s’effectue par le fonçage de puits tests de 1m3 jusqu’à 16m3 dans les bas-fonds, Ă©galement sur les pentes et autour des veines de quartz sur les collines. L’exploitation des gĂ®tes alluvionnaires se fait par l’ouverture de carrières de 5 m x 2 m x 2 m soit 20 m3 tandis que ceux filoniens se fait par l’ouverture de puits de 80 cm de diamètre et de profondeur allant jusqu’à 25 m. Le minerai alluvionnaire est traitĂ© par les lavages Ă  la batĂ©e ou au sluice tandis que celui des filons est pulvĂ©risĂ© avant de subir le mĂŞme traitement. La production aurifère se termine par la rĂ©cupĂ©ration de l’or après amalgamation au mercure. Sur le volet environnemental, ces mĂ©thodes laissent des puits bĂ©ants, dĂ©truisent les cultures tout en rĂ©duisant les espaces cultivables, accĂ©lèrent le drainage minier acide, rĂ©activent les conflits fonciers et exposent les communautĂ©s locales Ă  l’inhalation du mercure.   This study assesses the geological knowledge as well as the environmental impacts of artisanal gold mining activities at Doumbiadougou, CĂ´te d'Ivoire. The study is based on data from in situ description of exploration wells, quarries and gold recovery methods. Ore typology indicates two sets: the alluvial in the shallows and filonian on the surrounding hills. Their prospection is carried out by test wells of 1m3 up to 16m3 in the shallows, also on the slopes and around the quartz veins on the hills. The exploitation of alluvial deposits is done by the quarries of 5 m x 2 m x 2 m or 20 m3 while those filonian is done through wells of 80 cm in diameter and depth up to 25 m. The alluvial ore is treated by washing by women or sluice while that of the veins is sprayed before undergoing the same treatment. Gold production is finally recovered after amalgamation with mercury. On the environmental side, these methods leave gaping wells, destroy crops while reducing arable land, accelerate acid mine drainage, reactivate land conflicts and expose local communities to mercury inhalation

    Global and local characterization of rock classification by Gabor and DCT filters with a color texture descriptor

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    International audienceIn the automatic classification of colored natural textures, the idea of proposing methods that reflect human perception arouses the enthusiasm of researchers in the field of image processing and computer vision. Therefore, the color space and the methods of analysis of color and texture, must be discriminating to correspond to the human vision. Rock images are a typical example of natural images and their analysis is of major importance in the rock industry. In this paper, we combine the statistical (Local Binary Pattern (LBP) with Hue Saturation Value (HSV) and Red Green Blue (RGB) color spaces fusion) and frequency (Gabor filter and Discrete Cosine Transform (DCT)) descriptors named respectively Gabor Adjacent Local Binary Pattern Color Space Fusion (G-ALBPCSF) and DCT Adjacent Local Binary Pattern Color Space Fusion (D-ALBPCSF) for the extraction of visual textural and colorimetric features from direct view images of rocks. The textural images from the two G-ALBPCSF and D-ALBPCSF approaches are evaluated through similarity metrics such as Chi2 and the intersection of histograms that we have adapted to color histograms. The results obtained allowed us to highlight the discrimination of the rock classes. The proposed extraction method provides better classification results for various direct view rock texture images. Then it is validated by a confusion matrix giving a low error rate of 0.8% of classification.</p

    Abstracts of the 1st International Colloquium in Mine & Society

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    This book presents the abstracts of the selected contributions to the First International Colloquium on Mines and Society (CIMS) organized by The Higher Institute of Mining and Geology of Boke. The theme of this colloquium was "Mining and Sustainable Development, a major challenge for an Emerging Africa" which aims to bring together teachers, researchers, and Professionals from different backgrounds in order to exchange the results of their research work, share their points of view on the issue of mining and sustainable development. It also aims to define, in a collaborative and inclusive manner, research prospects or future projects between all the actors involved in this field. Colloquium Title: 1st International Colloquium in Mine &amp; SocietyTheme: Mining and Sustainable Development, A Major Challenge for an Emerging AfricaColloquium Date: 20-22 May 2022Colloquium Location: A L’Hôtel Rio Nunez de BokeColloquium Organizer: The Higher Institute of Mining and Geology of Bok
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