Application of Modelling Tools in Estonian Oil Shale Mining Area

Karu, Veiko; Västrik, A.; Valgma, Ingo

doi:10.3176/oil.2008.2s.05

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…At the same time largest losses are in the largest mine. In the future this trend continues [11] [12]. Mining depth and amount of losses is related to the stability of the overburden rocks [5][6] [7].…”

Section: Methodsmentioning

confidence: 99%

Reduction of Oil Shale Losses

Valgma

Väizene

Kolats

et al. 2015

ETR

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Oil shale utilisation losses reach 70% in some cases. These are closely related to legislation, backfilling and waste rock usage. Much smaller sections include production of oil, electricity and chemicals in which most of the research and development is performed today. Current urgent topics for investigating, testing and developing of oil shale mining related questions are backfilling, mechanical extracting of shale, fine separation, selective separation and optimised drilling and blasting. Reducing oil shale losses will be more actual in the future, because the depth of mining increases and the taxes for resource and pollutants are increasing as well.

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Section: Methodsmentioning

confidence: 99%

Reduction of Oil Shale Losses

Valgma

Väizene

Kolats

et al. 2015

ETR

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“…There are problems with the compatibility of projects as different institutions use different software systems. When developing co-operation, there are difficulties in connecting and transferring the data, which in turn poses an economic problem -designers have to have as many different software packages as possible for co-operation to work [15,16,35].…”

Section: Methodsmentioning

confidence: 99%

Mine Water as a Potential Source of Energy From Underground Mined Areas in Estonian Oil Shale Deposit

Karu¹,

Valgma²,

Kolats³

2013

Oil Shale

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Underground oil shale mining has been applied for ninety years inEstonian deposit in the middle-north part of Baltic oil shale deposit. The underground mining method of oil shale creates underground free space and the mine workings are filled with water after closure, which makes issues of land stability topical.Underground water pools or technogenic water bodies with all-the-yearround stable temperature are formed in the filled underground of oil shale mines. These water bodies have a potential for use as a source of heat for heat pumps and reduction of wintertime heating costs. The aim of this research is to calculate the amount of mine water in closed or abandoned oil shale mines in the central part of Estonian oil shale deposit and offer solutions for usage of undermined areas.Using mine water as a source of heat for heat pump stations means the possibility of using geothermal energy. The first pilot pump in Estonia was launched in Kiikla settlement in 2011. The best solution for such systems is a heat pump complex near Ahtme thermal power plant. The optimal size for the heat pump at Ahtme is 10 MW heat production. Different methods of heat collection for heat pump plants can be applied when other mines will be closed in the future.A 3D-model of the mined underground area has been created using geometric data of mine plans, acts of closed mines, as well as borehole and land survey data. The main tools chosen for spatial modelling were spreadsheets and Microsoft Access databases for systemising and querying data, MapInfo Professional for georeferencing, Vertical Mapper for interpolating and grid calculations and MODFLOW for pumping simulation. Each step of model creation involved analysis and decision on which values should be used to obtain modelling results. Layer thicknesses and required properties of water body were calculated using interpolated grids and surface elevations.

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“…As Estonian practice shows, breakage and crushing are moving towards more precise or selective techniques [18]. This suggests that future mining technologies might be classified according to mining conditions [19]. Many design and technology related decisions are made based on mechanical tests as methods.…”

Section: Introductionmentioning

confidence: 99%

Interdependence Between Point Load Index, Compressive Strength and Crushing Resistance of Jordan Oil Shale and Relation to Calorific Value

Väizene¹,

Valgma²,

PASTARUS³

et al. 2015

Oil Shale

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Rock parameters are important to be considered in mine design. Physical-mechanical tests were carried out on oil shale and dolostone samples from the Attarat Um Ghudran oil shale area in central Jordan, in order to determine the rock mass properties. It was necessary for assessing the feasibility of excavation and processing. Half-core and core samples were compressed up to failure during the Point Load Test (PLT) and Uniaxial Compressive Strength Test (UCST), respectively, and the PLT index (PLTI) and compressive strength were calculated. A conversion factor between PLTI and UCS for Jordan oil shale and dolostone was determined. The Crushing Resistance Test (CRT) on samples was conducted. Taking into consideration confidence limits, the recommended conversion factor 1 for Attarat oil shale and dolostone is respectively 14 and 12 and the recommended conversion factor 2 is 33 and 12, respectively. This knowledge is relevant in designing selective excavation and dry separation of oil shale.

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Application of Modelling Tools in Estonian Oil Shale Mining Area

Cited by 7 publications

References 2 publications

Reduction of Oil Shale Losses

Reduction of Oil Shale Losses

Mine Water as a Potential Source of Energy From Underground Mined Areas in Estonian Oil Shale Deposit

Interdependence Between Point Load Index, Compressive Strength and Crushing Resistance of Jordan Oil Shale and Relation to Calorific Value

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