Departmental Conferences

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Browsing Departmental Conferences by Author "Abeysinghe, AMKB"

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    Calcite and dolomite mineralization in the area around Balangoda and critical analysis of mining methods and utilization of the deposits
    (2014-08-08) Jayatissa, MDCP; Urapola, MOA; Perera, PAAP; Chandrakumara, GAK; Weerawarnakula, S; Abeysinghe, AMKB
    Among the industrial minerals found in Sri Lanka Calcium and Magnesium Carbonate bearing minerals and rocks play a major role in local industry. Crystalline Dolomite and Calcite found in metamorphic terrains are used in ceramic industry, fertilizer industry and in local lime manufacturing plants. Major Calcite and Dolomite occurrences in the metamorphic Precambrian basement are found in Digana, Kekirawa, Polonnaruwa, Balangoda, Baddulla, and Okkampitiya. Studies carried out in the area around Balangoda showed the calcite and dolomite occurrences are located in the area of Illukpellessa, Rajawaka and Molamure. Legal and illegal small scale mining has been carried out in the area during last few decades. Studies also showed most of the mining is carried out haphazardly. No proper mining methods have been used for maximum utilization of the deposits. Furthermore, long term mining has not uplifted the socio-economic conditions of the people of the area and proper environmental protection methods have also not been used. Systematic mapping of the deposits, educating miners on proper mining methods, safety precautions and value of environment protection could lead for better utilization of the deposits. Proper financial guidance through possible co-operate system to obtain financial assistance for mining, transporting materials and finding systematic market for continuous material supply could also uplift the socio-economiccondition of the community.
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    Development of oceanographic information dissemination system; an application of web GIS
    (2014-07-01) Senevirathne, AMNKBl; Pathirage, PU; Wijerathne, HKP; Kuhatheepan, S; Kuperajah, NI; Rajapaksha, JK; Abeysinghe, AMKB
    It is an essential requirement to promote offshore fishing activities systematically to protect the coastal fishery resources, which are in optimal level of exploitation. One of the alternatives available is to divert coastal fishing effort to offshore by providing information on offshore fishing grounds and favourable environmental parameters. Objective of this present study is to implement web GIS (Geographic Information System) as a supporting tool to transfer the satellite derived favourable environmental parameters for fish aggregations to the end user. In this study, satellite data were processed using remote sensing and GIS software and the web GIS application was developed using open source Map Server, PostgreSQL, PostGlS and Mapbender software. Four models were developed to process the raw data and processed data are uploaded weekly to the World Wide Web to enhance fishing activities. Potential fishing grounds, sea surface temperature (SST), chlorophyll (<""1-:(Lse),a surface height (SSH), ocean currents, bathymetry, exclusive economic zone and fishery harbour locations are displayed in the web GIS interface. Viewing, zooming, panning, distance measuring, displaying coordinates and attributes and load WMS(Web Map Service) functions are enabled to provide a dynamic framework to the user,
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    Digital image processing technique for partical size, shape and mineralogical, textural analysis.
    (2014-07-10) Siriwardana, MUVA; Deshapriya, NL; Abeysinghe, AMKB; Weerawarnakula, S; Premasiri, R
    Aggregate size and shape measurements are extremely important issues in mining and construction industry because of it directly affect the performance of aggregate products, also there is a prime need of textural analysis in many fields including g~ological and geotechnical studies. Traditional methods are time consuming and complex. In the present research, we applied DIP (Digital Image Processing) techniques for grain size analysis. Mainly, there are four sections which are unattached particles/fragment analysis, Attached particles/fragment Analysis, Moving particles/fragment Analysis and Colour, texture based classification. In unattached particles analysis, particles were spread without contacting each other and then analysis was done. In attached particles analysis, watershed transformation was applied to distinguish particles and then analysis was done. Moving particle analysis were performed by acquiring a video of free falling particles and generating contact-less flow of particles using video processing techniques. Colour and Texture based classification was done by separating the RGB (red, green, blue) bands and calculating mean, standard deviation and smoothness and then k-mean classification were performed. Finally results from Image processing methods were compared with the conventional methods. The method developed by the research was successfully applied in aggregate and sediment analysis.
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    Distribution of gaphite mineralizations in south- western part of Sri Lanka and the identification of suitable locations for mining.
    (2014-07-10) Batagalla, YMAS; Senewimala, EH; Rajapaksha, PV; Weerawarnakula, S; Premasiri, HMR; Abeysinghe, AMKB
    Exploitation and utilization of extremely pure vein Graphite in Sri Lanka have been known since seventeenth century. Sri Lanka is rich with highpurity variety of lump graphite .. The graphite mineralization is more noticeable in the south western part which is underlain by granulitic facies of high-grade metamorphic rocks belong inthe Highland Complex (HC) of the island. Past mining sites were identified through the literature survey, collection of historical data and field investigations. Hundreds of abandoned mines and pits were identified throughout the region. Veins found in this region follow the direction of foliation pattern, fold axes and the fracture pattern. Foliation varies from 3200 to 3400 bearing and fold axes in major anticlines and synclines also follow the same directions. Major fracture patterns are in a direction which varies from 400 to 70°. General dips of the veins are around 450. Vein thickness varies from 10cm to about 1m (lenses). Some of the major veins found in the area show over 90% carbon content. Three major areas have been identified as most suitable- locations for further investigations to be followed by mining. They are Aluketiya-Meegahatenna, Delgoda-Kalutara and Watareka-Padukka.
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    Dynamic Model to Forecast Slope Stability A Case Study: Geradiella Lanslide Site
    (2015-08-14) Abeygunasekara, WAHA; Hewavidana, SM; Jananthan, T; Madawala, RMS; Vaheeshan, K; Premasiri, HMR; Abeysinghe, AMKB; Weerawarnakula, S
    Forecasting the potential for disastrous events such as landslides has become one of the major necessities in the current world. Most of the landslides occurring in Sri Lanka are found to be triggered by intense rainfall events. This study was carried out on a landslide that occurred near Gerandiella waterfall, located in Kotmale Divisional secretariat in Sri Lanka. This project investigates the possibility of developing a dynamic model to map the spatial distribution of the slope stability using Geographic Information System (GIS). The model incorporates several theoretical models including the infinite slope model, Green Ampt infiltration model and Perched ground water flow model. A series of rainfall values can be fed to the model as the main input to simulate the dynamics of slope stability. Hydrological model developed using GIS is used to quantify the perched water table height. Infinite slope stability model is used to quantify the degree of slope stability in terms of factor of safety. DEM was built with the use of digitized contour data. Stratigraphy was modelled in Surfer software using borehole data and resistivity images. This model equipped with the predicted rainfall values can be used to forecast the slope dynamics of the area of interest.
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    Identifying Garnet Bearing Rocks Suitable for Mining and Processing of Manufactured Garnet Sand
    (2015-08-14) Senthuran, S; Boyagoda, EMRCL; Rukshan, AMM; Sathiyaparathan, T; Wannisinghe, WMVK; Weerawanakula, S; Premasiri, HMR; Rohitha, LPS; Abeysinghe, AMKB
    Garnet sand has a wide range of applications in mineral industry, mainly as an abrasive. The demand for garnet sand has been increasing rapidly during recent past. Industrial quality garnet can be recovered from beach sand deposits and crushing and processing of garnet rich rocks. In Sri Lanka, there are several garnet rich beach sand deposits. However, due to negative environmental effects, mining has not been carried out for recovery of garnet from such deposits. In this study, the objective being to identify suitable garnet rich rocks to recover manufactured garnet sand, geological map of the country was studied in detail. Out of several locations, Thanikotuwa village in Dewaladeniya GS division in Lakgala - Pallegama divisional secretariat of Matale district was selected. Detailed work was carried out in this location having 30.39% garnet recovery whereas. Garnet cut-off grade of only 15.68% is expected for a project for obtaining manufactured garnet sand only. Also in the processing stage, remaining crushed rock material can be used directly as fine aggregates in the construction industry. Economic feasibility studies show commencement of a manufactured garnet sand project including IML - A grade quarry, crushing and processing plant in this location is economically viable.
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    Phlogopite Mica Mineralization in the Central Part of Sri Lanka and Identify Suitable Areas for Mining
    (2015-08-14) Senanayake, HPSD; Pitawala, WWSM; Piratheep, B; Nivethan, T; Vinothan, K; Jotheesvaran, K; Weerawarnakula, S; Abeysinghe, AMKB; Premasiri, HMR
    Phlogopite mica has a significant importance as it has excellent thermal and electrical properties when compared to other types of mica. Sri Lanka is blessed with high quality Phlogopite mica mineralization and such deposits occur in Kebithigollawa, Medawachchiya, Rathnapura, Matale, Dambulla, Ambilipitiya, Kollonne, Dehiaththakandiya, Naula and Mailapitiya of Kandy. Mica mining in the central part of Sri Lanka in Mailapitiya off Kady has been carried out during the British regime before 1948. Investigations carried out in the area around Kandy - Mailapitiya shows occurrence of economically minable Phlogopite mica mineralization. The vein thickness of the Phlogopite mica varies from 0.1 cm – 0.8m and extends in N10º-20ºW direction. They generally follow the joint pattern of the metamorphic country rocks. Mica found in the area have similar properties although show slight variation in quality due to difference in degree of weathering. Phlogopite mineralization occurs in association with a pyroxenite body which has been intruded into the area prior to Phlogopite mica mineralization. The pyroxenite bodies show higher concentration of Nickel and Gold. Thus, it is worth to carry out detailed investigations of the pyroxenite body while conducting the mining operations in the area.