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Gold Mineralisation in the Intiédougou Prospect (Diébougou District) in Southwest Burkina Faso, West African Craton
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作者 Yao Honoré Koffi Wendkouni Passecdé Pauline Zongo +1 位作者 Nanema Mathieu Urbain Wenmenga 《Journal of Minerals and Materials Characterization and Engineering》 2024年第1期63-77,共15页
The Intiédougou located in the Houndé Birimian greenstone belt has been the subject of several mining and geoscience studies that have led to the discovery of mineralized gold targets. One of these mineraliz... The Intiédougou located in the Houndé Birimian greenstone belt has been the subject of several mining and geoscience studies that have led to the discovery of mineralized gold targets. One of these mineralized targets has prompted work that raises the issue of control factors for the gold mineralization of the prospect. The methodology used in this study combines a study of core drill hole data located in the area and laboratory studies. The Intiédougou sector is based on andesito-basaltic, andesitic interstratified volcanoclastite rocks and Tarkwaïen type detrital sedimentary rocks caught in a vice in the volcano-sedimentary unit. Lithostructural analysis of the sector shows that the subvolcanic rocks bearing gold mineralization are subjected to heterogeneous ductile to brittle deformations and affected by hydrothermalism evolving at stages marked by large fissure fillings. These hydrothermal phases evolve in the zones of expansion created by the brittle deformations that have contributed to the deposits of different types of gold-enriched sulphides. These different phases of hydrothermal destabilization generally of low degree accompany the tardi to post-eburnean brittle tectonics. This deformation system is favorable to the establishment of gold mineralization in the form of vein bodies. The overimposition of deformed and altered areas suggests a genetic relationship between deformation and hydrothermal activity. In conclusion, the mineralization of Intiédougou in vein styles, set up in a volcanic arc environment with a paragenesis of gold-pyrite deposit ± chalcopyrite would be controlled by the structural aspect and accompanied by hydrothermal alteration. 展开更多
关键词 Intiédougou Prospect SHEAR HYDROTHERMAL Tarkwaïan Gold Mineralization
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Effect of Farm Product Intrinsic Properties on Convective Drying: Case of Okra 被引量:2
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作者 Ouoba Kondia Honoré Zougmore Francois Desmorieux Hélène 《American Journal of Plant Sciences》 2019年第1期101-110,共10页
In this study, the material is okra, a cucurbitaceous largely consumed in West Africa and South Asia. The influence of the external air parameters on food drying with different size, maturity, shape of the material is... In this study, the material is okra, a cucurbitaceous largely consumed in West Africa and South Asia. The influence of the external air parameters on food drying with different size, maturity, shape of the material is considered by convective drying. So, the okra was cut in several parts according to its three characteristic zones, the basis, the middle of the okra and the extremity because the three parts of the vegetable have not the same resistances in transfers by convective drying. The maturity of the okra also has an influence. The okra dries faster in its younger or older age. Okra dries slowly when its maturity is convenient to be consumed. The drying duration of okra with the age of 1, 2, 3, 4 and 5 days is respectively 580, 780, 990, 1200 and 850 min. When we consider the three (matters) constituent of the okra: the skin, the seeds and the central material, the central matter dries faster. The diffusion coefficient was identified in all cases in order to compare the influence of those intrinsic properties of that food. 展开更多
关键词 CONVECTIVE Drying OKRA INTRINSIC PROPERTIES Food MATURITY Size Diffusion Coefficient
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Morbidity and Mortality of Inpatients in the Department of Infectious Diseases of the University Hospital of Bobo-Dioulasso, Burkina Faso 被引量:2
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作者 Armel Poda Jacques Zoungrana +13 位作者 Arsène Héma Ziemlé Clément Méda Alexandre Boena Rainatou Boly M’winmalo Ines Evelyne DA Apoline Sondo Nongodo Firmin Kaboré Sandrine Hien Ismael Diallo Mamadou Savadogo Eric Arnaud Diendéré Abdoul-Salam Ouédraogo Issiaka Sombié Athanase Millogo 《Advances in Infectious Diseases》 2019年第3期171-182,共12页
Background: Infectious Diseases are responsible for nearly 17 million annual deaths worldwide. Burkina Faso, like the majority of poor countries, remains vulnerable to infectious diseases. The objective of the present... Background: Infectious Diseases are responsible for nearly 17 million annual deaths worldwide. Burkina Faso, like the majority of poor countries, remains vulnerable to infectious diseases. The objective of the present study was to analyze the profile of inpatients, including the mortality and causes of death, in the Infectious Diseases Department of Sour&#244;Sanou teaching hospital (Bobo-Dioulasso, Burkina Faso). Methods: We carried out a cross-sectional study based on medical records of all inpatients from 2011 to 2015. Results: We included 1169 patients. The gender ratio was 0.8. The age group 30 to 39 was more represented (30.2%) as well as housewives and farmers (73.7%). Over one-thirds of the patients (35.3%) were consulted within an average of 7 days. The most common reason for consultation was fever (65.1%). Around 62.0% of inpatients were infected by the Human Immunodeficiency Virus (HIV). Digestive diseases ranked first (21.8%) followed by nervous system disorders (19.4%) and tuberculosis (17.8%). Overall morbidity rate was 31.3%. About 42% were admitted to the emergency ward while 83.3% already arrived with poor health condition. And 82.1% of deaths occurred on pathological grounds of which 66.7% were related to HIV. Main causes of death included nervous system diseases (28.6%), tuberculosis (21.9%) and gastrointestinal diseases (18.3%). Conclusion: Infectious diseases remain a major public health issue. Further efforts are needed to improve their management in Burkina Faso. 展开更多
关键词 MORBIDITY Mortality INFECTIOUS Diseases CAUSES of DEATHS Burkina Faso
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Characterization and Potential Recovery of Household Solid Waste in the City of Ouagadougou (Burkina Faso) 被引量:1
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作者 Kayaba Haro Issoufou Ouarma +2 位作者 Bernard Nana Antoine Bere Jean Koulidiati 《Journal of Environmental Protection》 2018年第4期309-324,共16页
This study on physical and physicochemical characteristics of household solid waste (HSW) in the city of Ouagadougou by using MODECOM, “Method of Characterization of Household waste” was done fifteen (15) years afte... This study on physical and physicochemical characteristics of household solid waste (HSW) in the city of Ouagadougou by using MODECOM, “Method of Characterization of Household waste” was done fifteen (15) years after the first study. Special attention has been paid to waste sampled and also to estimate energy content, namely the higher heating value (HHV) and the lower heating value (LHV). As a general tendency, the results showed a sensitive evolution in the physical parameters of waste (composition by size and composition by category) and also in the physicochemical parameters (moisture content and energy content). The results of HSW composition study showed that regardless the seasons, fermentable fraction is dominant (39% in the rainy season and 20% in the dry season) followed by plastics (18% in the rainy season and 20% in the dry season). The moisture content is measured to be 56.69% and 37.69% respectively in the rainy season and dry season. The results analysis of the potential of recovery showed that the organic recovery is more important (60% in the rainy season and 55% in the dry season) than the matter recovery (43% in the rainy season and 46% in the dry season). These results highlight the need for organic recovery and matter recovery of HSW in the city of Ouagadougou. The results from the analysis of the energy content showed that the HHV is estimated to be 17.94 MJ/kg in the rainy season and 17.96 MJ/kg in the dry season. The LHV is calculated to be 6.38 MJ/kg in the rainy season and 10.27 MJ/kg in the dry season. These results suggest that incineration as treatment of HSW in the city of Ouagadougou is not economically an appropriate option. 展开更多
关键词 WASTE CHARACTERIZATION WASTE RECOVERY MODECOM Energy Content Calorific Value OUAGADOUGOU
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What Process Optimizes Convective Drying of Farm Products with Complex Constitution:Case of Okra(Abelmoschus esculentus) 被引量:1
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作者 Ouoba Kondia Honoré Desmorieux Hélène Zougmore Francois 《Journal of Agricultural Chemistry and Environment》 2019年第1期14-22,共9页
In this paper, we propose an optimized process for farm product convective drying. Above and beyond the influence of the air parameters on foodstuff convective drying, this work shows that product internal parameters ... In this paper, we propose an optimized process for farm product convective drying. Above and beyond the influence of the air parameters on foodstuff convective drying, this work shows that product internal parameters and drying proceedings must be taken into account during the evaluation of their convective drying. Results indicate that okra maturity influences its convective drying. It dries faster when it is too young or when it is advanced age. Drying time of okra of 1, 2, 3, 4 and 5 days old is respectively 580 min, 780 min, 990 min, 1200 min and 850 min. Also, one observes that considering okra on its three zones according it length, i.e. its base, middle and extremity parts have not the same resistance to transfers during convective drying. These three zones have respectively 400 min, 520 min and 600 min of drying time. Okra cut reveals a major importance on its convective drying evaluation. The longitudinal cut di-viding okra on four parts, sliced with 5 mm and 10 mm of thickness and the whole okra put respectively 150 min, 200 min, 280 min and 400 min for their drying. At last, three (03) different constituents of okra, namely, the skin, the seeds and central material behave differently during convective drying. The drying time of the central material, the seeds and the skin is about 70 min, 150 min and 190 min respectively, against 400 min for the whole okra. 展开更多
关键词 Okra Convective Drying MATURITY Constituents Form Cut
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Deactivation Processes, Regeneration Conditions and Reusability Performance of CaO or MgO Based Catalysts Used for Biodiesel Production—A Review
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作者 Nombamba Oueda Yvonne L. Bonzi-Coulibaly Igor W. K. Ouédraogo 《Materials Sciences and Applications》 2017年第1期94-122,共29页
The activity of a catalyst in transestrification reaction usually declines with repeated uses and this limits the possibility to use it many times. This paper presents a review of various techniques used to evaluate t... The activity of a catalyst in transestrification reaction usually declines with repeated uses and this limits the possibility to use it many times. This paper presents a review of various techniques used to evaluate the activity changes, the recycling processes for calcium and magnesium oxides based heterogeneous catalysts for biodiesel production. The activity of calcium and magnesium oxides based catalysts declines due to leaching, surface or active sites poisoning by reactant or product molecules and modification of physical aspects. Physico-chemical methods (AAS, BET, CO2-TPD, EDS, FTIR, ICP-AES, SEM, TG/DTA and XRD were used to check the catalyst modification and to confirm the deactivation. When separated from the reaction mixture by filtration, the catalyst could be reused without any treatment or recycled by washing, drying or/and recalcination. Between various recycling processes for calcium and magnesium oxides based catalysts, mixed oxides showed less leaching and performed FAME or FAEE yield >90% with reusability. 展开更多
关键词 DEACTIVATION Recycling Metal OXIDES Catalyst TRANSESTERIFICATION BIODIESEL
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Hydrogeochemical and multi-tracer investigations of arsenic-affected aquifers in semi-arid West Africa 被引量:3
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作者 Anja Bretzler Lucien Stolze +5 位作者 Julien Nikiema Franck Lalanne Elaheh Ghadiri Matthias S. Brennwald Massimo Rolle Mario Schirmer 《Geoscience Frontiers》 SCIE CAS CSCD 2019年第5期1685-1699,共15页
The semi-arid Sahel regions ofWest Africa rely heavily on groundwater from shallow to moderately deep (<100 m b.g.l.) crystalline bedrock aquifers for drinking water production.Groundwater quality may be affected b... The semi-arid Sahel regions ofWest Africa rely heavily on groundwater from shallow to moderately deep (<100 m b.g.l.) crystalline bedrock aquifers for drinking water production.Groundwater quality may be affected by high geogenic arsenic (As) concentrations (>10 μg/L) stemming from the oxidation of sulphide minerals (pyrite,arsenopyrite) in mineralised zones.These aquifers are still little investigated,especially concerning groundwater residence times and the influence of the annual monsoon season on groundwater chemistry.To gain insights on the temporal aspects of As contamination,we have used isotope tracers (noble gases,3H,stable water isotopes (2H,18O)) and performed hydrochemical analyses on groundwater abstracted from tube wells and dug wells in a small study area in southwestern Burkina Faso.Results revealed a great variability in groundwater properties (e.g.redox conditions,As concentrations,water level,residence time) over spatial scales of only a few hundred metres,characteristic of the highly heterogeneous fractured underground.Elevated As levels are found in oxic groundwater of circum-neutral pH and show little relation with any of the measured parameters.Arsenic concentrations are relatively stable over the course of the year,with little effect seen by the monsoon.Groundwater residence time does not seem to have an influence on As concentrations,as elevated As can be found both in groundwater with short (<50 a) and long (>10^3 a) residence times as indicated by 3He/4He ratios spanning three orders of magnitude.These results support the hypothesis that the proximity to mineralised zones is the most crucial factor controlling As concentrations in the observed redox/pH conditions.The existence of very old water portions with residence times >10^3 years already at depths of <50 m b.g.l.is a new finding for the shallow fractured bedrock aquifers of Burkina Faso,suggesting that overexploitation of these relatively low-yielding aquifers may be an issue in the future. 展开更多
关键词 Arsenic Groundwater chemistry WEST AFRICA Fractured aquifers RESIDENCE time NOBLE gases
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Ankylosing Spondylitis in Sub-Saharan Africa: A Series of 48 Cases Reported in Burkina Faso (West Africa)
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作者 Wendlassida Joelle Zabsonre Tiendrebeogo Serge Aime Sawadogo +7 位作者 Fulgence Kabore Alain Ilboudo Charles Sougue Enselme Zongo Camille Sompougdou Moussa Ouédraogo Evariste Tiendrebeogo Dieu-Donne Ouedraogo 《Open Journal of Rheumatology and Autoimmune Diseases》 2018年第3期87-92,共6页
Background: Ankylosing spondylitis is rare in sub-Saharan Africa. The purpose of our study was to report cases of AS in a black African population and to see the influence of gender. Method: It was a retrospective stu... Background: Ankylosing spondylitis is rare in sub-Saharan Africa. The purpose of our study was to report cases of AS in a black African population and to see the influence of gender. Method: It was a retrospective study conducted in the Rheumatology Department of Ouagadougou University Hospital, Ouagadougou, from March 2006 to February 28, 2015 for a period of nine years. All the patients who went under a rheumatology consultation during the study period were included. Patients with AS defined by the modified New York criteria were selected. Result: Forty-eight (0.61%) cases of AS were diagnosed among 7806 patients received in the rheumatology department during the study period. The search for the HLA B27 antigen in 20 patients was positive in 11 (55%). Half of the patients (50%) had a BASDAI score ≥ 4. Sacroiliitis was observed in all patients;it was stage 4 in 8 patients. Comparing by sex, there was no statistically significant difference by gender. Conclusion: Prevalence of ankylosing spondylitis increases. The presentation is similar to that of the caucasian series. 展开更多
关键词 ANKYLOSING SPONDYLITIS Black AFRICAN GENDER
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