Ghana Mining Journal最新文献_第10页

Analysis of Underground Mining Accidents at AngloGold Ashanti Limited, Obuasi Mine 盎格鲁-阿散蒂有限公司奥布西矿地下开采事故分析

Ghana Mining Journal Pub Date : 2009-05-19 DOI: 10.4314/GM.V10I1.42805

N. Amegbey, S. Ndur, Rk Adjei

引用次数: 5

Management of Acid Mine Drainage within a Wetland in the Tarkwa Area 塔克瓦地区湿地酸性矿井排水的管理

Ghana Mining Journal Pub Date : 2009-05-19 DOI: 10.4314/GM.V10I1.42810

V. Frempong, E. Asiam, J. Kuma

引用次数: 0

Estimation of Reminant Gold Resources of Old Underground Workings by Indicator Approach – A Case Study 用指标法估算旧地下巷道剩余金资源量——以实例为例

Ghana Mining Journal Pub Date : 2009-05-19 DOI: 10.4314/GM.V10I1.42806

S. Al-Hassan, L. Aboagye

引用次数: 0

Analysis of Truck Downtimes Using Log Dispersion Plot 用对数离散图分析卡车停机时间

Ghana Mining Journal Pub Date : 2009-05-19 DOI: 10.4314/GM.V10I1.42803

V. Temeng, P. Eshun

引用次数: 0

Do Students of Mining and Allied Engineering Programmes have any Problems in English 采矿及相关工程专业的学生在英语方面有什么问题吗

Ghana Mining Journal Pub Date : 2009-05-19 DOI: 10.4314/GM.V10I1.42811

P. B. Mireku-Gyimah

{"title":"Do Students of Mining and Allied Engineering Programmes have any Problems in English","authors":"P. B. Mireku-Gyimah","doi":"10.4314/GM.V10I1.42811","DOIUrl":"https://doi.org/10.4314/GM.V10I1.42811","url":null,"abstract":"In recent times, concerns about the falling standard of English among university students in Ghana have generated many studies, which have focused mainly on analysis of errors in the English of students, using test-based extracted data such as student examination scripts or students’ responses to questionnaires and interviews specially designed for the purpose. These studies have usually centred on undergraduate students but none has involved the students of University of Mines and Technology (UMaT). This paper studies the standard of English among undergraduates of UMaT, who are all students of mining and allied engineering programmes. Unlike previous studies, the data comprise 498 faulty sentences selected from comments written by the students on their lecturers’ teaching performance. This source of data is not test-based because the students write the comments anonymously, at their leisure and without knowing that the errors they commit could be used to assess their competence level in English. The comments therefore reflect the English that the students normally know. The faults detected in the comments are categorised into nine error types and the frequency of occurrence calculated for each category. Samples from each category are tabulated and analysed while assigning plausible reasons for the errors and suggesting corrections. The analysis shows that the most frequently occurring errors involve wrong register (wrong tone of language and vocabulary misuse) and wrong concord (subject-verb disagreement) while the least frequently occurring ones involve wrong punctuation and capitalisation as well as wrong adjective, adverb and pronoun usage. The findings indicate that the students have difficulties in expressing themselves in formal, written English owing to limited lexicon and inadequate knowledge in English grammar, usage and style. To reverse the situation, it is suggested that the Communication Skills course be extended beyond the current first year of undergraduate study and given more emphasi.","PeriodicalId":12530,"journal":{"name":"Ghana Mining Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87937609","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}

引用次数: 4

Water Management and Supply in a Mining Community – A Case Study of Tarkwa and its Environs 矿业社区的水管理与供应——以塔克瓦及其周边地区为例

Ghana Mining Journal Pub Date : 2009-05-19 DOI: 10.4314/gm.v10i1.42801

C. Boye, A. Mensah

{"title":"Water Management and Supply in a Mining Community – A Case Study of Tarkwa and its Environs","authors":"C. Boye, A. Mensah","doi":"10.4314/gm.v10i1.42801","DOIUrl":"https://doi.org/10.4314/gm.v10i1.42801","url":null,"abstract":"Since mining activities require a lot of water and also increase population of host communities as a result of influx of workers, water resources in mining communities must be efficiently managed. This paper considered the various factors affecting water supply and its distribution in the Tarkwa area, a mining community, to find out the possible reasons for the inadequate water supply to Tarkwa. The maximum flood discharge for a reservoir constructed along the course of the River Bonsa was computed as 81.34 m3 /s using the rational method for the estimation of peak flood flow. The volume of containment of the reservoir was also calculated from hydrographic surveys data to be 25 456 m3. These results were analysed against the water demand vis-a-vis the current population growth. Also the condition of the equipment for pumping water both from the reservoir for treatment and after treatment to the storage tanks from where water is supplied to customers were considered together with the capacity of the treatment plant and the booster station at Bonsaso and Tamso respectively. It was concluded that the reservoir has enough water to meet the demand. However, the problem of inadequate supply was traced to non-regular power supply to both the treatment plant and booster station from where customers are served.","PeriodicalId":12530,"journal":{"name":"Ghana Mining Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75816120","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}

引用次数: 0

Establishing Ground Vibration Threshold Level for Open Pit Mining Environment - A Case Study 露天开采环境中地面振动阈值的建立——以实例为例

Ghana Mining Journal Pub Date : 2009-05-19 DOI: 10.4314/GM.V10I1.42804

Sk Yomekpe-Agbeno, M. Affam

{"title":"Establishing Ground Vibration Threshold Level for Open Pit Mining Environment - A Case Study","authors":"Sk Yomekpe-Agbeno, M. Affam","doi":"10.4314/GM.V10I1.42804","DOIUrl":"https://doi.org/10.4314/GM.V10I1.42804","url":null,"abstract":"To assess the impact of blasting activities on building structures in open pit mining districts in Ghana a study was carried out in Prestea, a township very close to the perimeter of the Plant North pit of the Bogoso Gold Ltd (now Golden Star Resources Bogoso/Prestea Mines), in the Western Region of Ghana. It was observed during the study that the quality of most 'residential building structures within the Prestea township and its environs were generally sub-standard. Most of the houses were in a deplorable state of disrepair with their conditions already triggering failure. Again, it was noted that no records were available to ascertain the structural state of the buildings prior to the commencement of blasting activities at the pit, necessitating the need to carry out a baseline study of buildings in nearby Himan townships for comparative analysis. It was also observed that even though management had selected 12 mm/s as its threshold for its operations in the pits only 6% of the over 542 blasts monitored over a two and half year period had ground vibration values in excess of 1.5 mm/s, with a maximum recorded value of 8 mm/s. It is recommended that management should not adopt ground vibration levels in excess of 2 mm/s for their pit operations because of the poor infrastructure within the surrounding communities. Even though this level can increase drilling and blasting costs considerably, it is considered a better option than expensive lawsuits in the likely event of any further damages that may be caused to building structures in the township.","PeriodicalId":12530,"journal":{"name":"Ghana Mining Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81107317","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}

引用次数: 0

Evaluating the Acid Mine Drainage Potential at Abosso Goldfields Limited (AGL), Ghana 加纳Abosso Goldfields Limited (AGL)酸性矿山排水潜力评估

Ghana Mining Journal Pub Date : 2009-02-13 DOI: 10.4314/GM.V9I1.42604

J. Kuma, D. Asamoah

{"title":"Evaluating the Acid Mine Drainage Potential at Abosso Goldfields Limited (AGL), Ghana","authors":"J. Kuma, D. Asamoah","doi":"10.4314/GM.V9I1.42604","DOIUrl":"https://doi.org/10.4314/GM.V9I1.42604","url":null,"abstract":"Occurrence of Acid Rock Drainae (ARD) affects both plants and animals that are present in a drainage system. In some base metal and coal mining environments, the presence of sulphide minerals especially pyrite and their exposure to oxygen and water may trigger Acid Mine Drainage (AMD). Evaluation of the potential for acid generation is therefore very important in any mine setting where sulphide minerals exist. Results of two Acid-Base Accounting (ABA) studies conducted at Abosso Goldfields Limited (AGL) on 120 rock and tailings samples reveal that on average, total sulphide values in rocks are low, with 83 % less than 0.20 %. More than 95 % show Neutralisation Potential Ratio (NPR) of 2 and above, indicating the presence of excess neutralising capacity in the rocks and tailings to prevent acid generation. Also, more than 93 % of the samples possess long-term acid neutralisation because their Neutralisation Potentials (NP) are more than 10 and their total sulphide are less than 0.1 %. Average up- and down- stream measurements of pH were respectively 6.55 and 6.74 while for TSS (Total Suspended Solids), the values were respectively 14.9 mg/l and 7.2 mg/l, indicating improved water quality after passing through the mine. Although these figures show very high NP's, the presence of less than 7% samples with the potential to generate acidity necessitates that AMD monitoring should continue, especially in meta-sedimentary and siltstones to ensure acid generation does not arise during mining. Ghana Mining Journal Vol. 9 2007: pp. 8-16","PeriodicalId":12530,"journal":{"name":"Ghana Mining Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91296839","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}

引用次数: 0

Use of Simulation Techniques in Determining the Fleet Requirements of an Open Pit Mine 模拟技术在确定露天矿山机队需求中的应用

Ghana Mining Journal Pub Date : 2009-02-13 DOI: 10.4314/GM.V9I1.42606

R. Suglo, S. Al-Hassan

{"title":"Use of Simulation Techniques in Determining the Fleet Requirements of an Open Pit Mine","authors":"R. Suglo, S. Al-Hassan","doi":"10.4314/GM.V9I1.42606","DOIUrl":"https://doi.org/10.4314/GM.V9I1.42606","url":null,"abstract":"When the final feasibility report on a new mine indicates that it is feasible under the prevailing technological and economic conditions to develop the project into an open pit mine, mine managers are often faced with the problem of determining the capacities, fleet sizes and how to match the materials handling equipment to ensure maximum production and profitability of the mine. One option is to use the results from other operating mines in similar geographic, geological and economic environments. Of late, most mine managements are increasingly depending on the results of computer simulations of their operations to determine the capacities, fleet sizes, for equipment matching. This paper uses the Visual SLAM with AweSim simulation software to determine the optimum fleet sizes of Kantaayele\u0000Goldfields Ltd., a gold mine in Ghana, which will enable the mine to meet its waste stripping and ore production targets. The use of simulation techniques as a tool in the modeling, formulation and testing of several models in the ore and waste mining operations of the mine are demonstrated. The results obtained from the simulation runs show that the mine cannot achieve its targets in ore mining and waste stripping with its initial fleets operating over 7.5-hour shifts per day. Using waiting times and queue lengths at the shovel and crusher locations as the determinants, the optimum fleet size for ore mining was found to be Option E with six 80-tonne trucks operating over 1350 minutes. For the waste stripping operations, the optimum fleet size was determined to be fourteen 80-tonne trucks. Ghana Mining Journal Vol. 9 2007: pp. 25-32","PeriodicalId":12530,"journal":{"name":"Ghana Mining Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87465800","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}

引用次数: 4

Analysis of the Trends of Gold Mining in Ghana 加纳金矿开采趋势分析

Ghana Mining Journal Pub Date : 2009-02-13 DOI: 10.4314/GM.V9I1.42608

A. B. Gbireh, A. Cobblah, R. Suglo

{"title":"Analysis of the Trends of Gold Mining in Ghana","authors":"A. B. Gbireh, A. Cobblah, R. Suglo","doi":"10.4314/GM.V9I1.42608","DOIUrl":"https://doi.org/10.4314/GM.V9I1.42608","url":null,"abstract":"Indigenous mining of gold in Ghana dates as far back as the 4th century. Large scale mining began in Ghana around 1500. Over the years, gold has been Ghana's major foreign exchange earner. However, the gold mining industry has gone through periods of gold booms and declines. Several measures were taken to make the gold mining sector attract foreign investment with little success until 1986 when the Minerals and Mining Law was promulgated. This paper attempts to analyse the factors that have affected the trends in gold mining in Ghana over the years and to suggest useful guidelines in mineral policy formulation to attract more foreign investment to enhance gold mining in Ghana.\u0000The results of the analysis show that the creation of a conducive investment climate by the promulgation of the Minerals and Mining Law (PNDC Law 153), the adoption of a new investment code, the long period of political stability since 1981 and the reforms and restructuring of the mining sector in Ghana resulted in increased gold production, greater private sector ownership and management, enhanced environmental awareness and\u0000community relations. In-house mining has given way to contract mining as most companies in Ghana have contracted out their mining operations to mining and service contractors. Ghana Mining Journal Vol. 9 2007: pp. 38-49","PeriodicalId":12530,"journal":{"name":"Ghana Mining Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72684935","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}

引用次数: 8