ISERME - 2018
http://dl.lib.uom.lk/handle/123/14734
2024-03-28T21:13:51ZInternational Symposium on Earth Resources Management & Environment 2018 [Pre Text]
http://dl.lib.uom.lk/handle/123/21200
International Symposium on Earth Resources Management & Environment 2018 [Pre Text]
Abeysinghe, AMKB
2018-08-01T00:00:00ZNoise and vibration control in crusher plant activities to enhance health and safety of workers
http://dl.lib.uom.lk/handle/123/17426
Noise and vibration control in crusher plant activities to enhance health and safety of workers
Thiruchittampalam, S; Kinoj, A; Ekanayake, EMCK; Vithurshan, S; Hemalal, PVA; Samaradivakara, GVI; Rohitha, LPS; Chaminda, SP
Abeysinghe, AMKB; Samaradivakara, GVI
Fulfillment of human needs necessitates activities that have their positive and
negative aspects. Crusher plant operation is not an exception. One of the major
concerns related to these activities is its impact on worker health and safety.
Although noise and vibration related legislation focus on reduction at the source,
provision of personal protective equipment is considered as an effective method of
control. The focus of this study was to look for control strategy for noise and foot
transmitted vibration hazards related to fixed machineries in crusher plants. Six
crusher plant sites were selected based on their varying production capacity for the
study. Accordingly, selected sites were visited to carry out area noise and wholebody
vibration surveys. Plant arrangement, details of crusher units, prevailing
meteorological conditions and ground conditions were also recorded. Daily
exposure levels were determined and sound and whole-body vibration contour
maps were developed based on Control of Noise and Vibration at Work Regulations
Act 2005. Relationship of areas of hazardous zones w i t h production capacity was
determined using statistical tools and the level of worker awareness was studied
through one to one interviews. Cost effective controls are recommended by
studying the best practices.
2018-08-01T00:00:00ZGeochemical approach of phosphate mineral exploration in lake sediments around Eppawala phosphate deposit, Sri Lanka
http://dl.lib.uom.lk/handle/123/17425
Geochemical approach of phosphate mineral exploration in lake sediments around Eppawala phosphate deposit, Sri Lanka
Dushyantha, NP; Hemalal, PVA; Jayawardena, CL; Ratnayake, AS; Ratnayake, NP
Abeysinghe, AMKB; Samaradivakara, GVI
Mineral exploration is a stochastic process of finding and locating commercially
viable mineral resources. In this regard, lake sediment is an important material in
exploration as it contains three distinct types of minerals i.e. allogenic or detrital
minerals (minerals brought into the lake from outside of the lake), endogenic
minerals (minerals originated within the lake) and authigenic minerals (minerals
formed during the diagenetic alteration of sediments). Koon-wewa, Ihalahalmillawewa
and Kiralogama-wewa are three lakes connected with a man-made water
canal, namely Jaya-Ganga flowing across the Eppawala Phosphate Deposit (EPD).
Kiralogama-wewa is located downstream of the EPD whereas other two lakes are
located upstream. Thus, lake sediments in the downstream lake could be influenced
by the phosphate-bearing minerals derived from the EPD. The bulk chemical
analyses of surface lake sediments showed that average P2O5 concentrations were
0.80% and 0.45% in downstream and upstream, respectively. Further, in
downstream, P2O5 significantly and positively correlated with AI2O3, CaO, Fe203,
K2O and MnO whereas no such correlations were observed in upstream sediments.
Presence of calcium-iron-aluminum phosphate minerals such as fluorapatite,
crandallite, millisite and strengite in downstream sediments, revealed via
mineralogical analyses, delineated the above correlations. Moreover, high Chemical
Index of Alteration (CIA) values were observed in the downstream sediments which
indicate intense chemical weathering conditions in the source area. It is justified by
the presence of weathering products of the EPD such as crandallite and millisite in
the downstream sediments. Grain size analyses displayed a dominant silt fraction in
both upstream and downstream areas. Textural analyses in downstream revealed
the relative proximity of the source and nature of the material deposition through
solid suspension. Presence of fluorapatite (detrital mineral) in downstream is
corrobarated the conclusion in textural analyses. Four representative core samples
were obtained from both the upstream and downstream lakes. In upstream core
samples, P2O5 concentrations varied from 0.03% to 1.81% whereas P2O5
concentrations in downstream core samples varied f r om 0.26% to 2.22%. Continuous
sediment supply via Jaya-Ganga can also improve the fertilizing capacity of
downstream lake sediments, eventually; becoming a commercially viable phosphate
mineral resource.
2018-08-01T00:00:00ZUAV application for blast design and fragmentation analysis
http://dl.lib.uom.lk/handle/123/17424
UAV application for blast design and fragmentation analysis
Miranda, V; Bhatawdekar, RM; Leitei, F; Gupte, A; Sobral, R; Edy, TM; Pradhan, GK
Abeysinghe, AMKB; Samaradivakara, GVI
With the advancement of various techonlogies during last two decades, processing
power of computers and software development, accuracy in Geographical
Positioning System (GPS), photogrammetry with high resolution digital camera,
cloud computing, application of Unmanned Aerial Vehicle (UAV) in mining
application is providing benefits. Blasting is one of the critical operation in any
excavation system in mining, was dependent on conventional methods of analysis
till new technologies made in-roads in last few decades period. Digitised Terrain
Models (DTM) are developed based on images captured of mine terrain and mine
faces(as a part of pre-blast and post-blast situations). With mobile phone application
vis-a-vis App based, real charge per hole, 2D/3D view of borehole patterns,
geometric paramters, real coordinates of blast location and boreholes and presence
of water in individual borehole can be recorded. For measurement of blast
fragmentation, UAV is flown on blasted muckpile with video recording of images.
Blast fragmentation photographs are analysed using image analysis software.
Photographs are useful to calculate blasted rock volume. This paper describes two
case studies. In one of aggregate (granite) quarry in Malaysia, with the help of UAV
aerial phographs were obtained to identify rock types and geological structures
which improved blast design. In another case study, in photgrapghs of blasted
muckpile are taken manually in limestone quarry. Results of blast fragmentation
prediction by software Vs image analysis are discussed in this paper.
2018-08-01T00:00:00Z