scholarly journals GEOTECHNICAL PROCESSES AND SOIL-WATER MOVEMENT WITH TRANSPORT OF POLLUTANTS IN THE ESTONIAN OIL SHALE MINING AREA

2006 ◽  
Vol 1 ◽  
pp. 79 ◽  
Author(s):  
K. Erg ◽  
E. Reinsalu ◽  
I. Valgma
Keyword(s):  
Oil Shale ◽  
Water Regime ◽  
Water Movement ◽  
Ground Surface ◽  
Background Level ◽  
Mining Area ◽  
Natural Background ◽  
Processing Plants ◽  
Oil Shale Mining ◽  
Soil Water Movement

One of the most important industries of Northeast Estonia is oil shale mining. Ground movements caused by mining reach the ground surface easily due to shallow location of workings. A new, artificial topography is formed on undermined areas, where the ground surface depressions are alternating with rising grounds. When the Quaternary cover contains loamy sediments, the surface water will accumulate in the depressions. The response of usable lands on undermined areas depends on the degree of changes in the relief and water regime. The accumulation of solid residues by oil shale mines and processing plants has resulted in numerous ash hills, which are polluting the environment. The streams are polluted by phenols, oil products and sulphates. The main source of water supply is groundwater in the oil shale basin. The hydrostratigraphic section is represented by three aquifers. Two (Quaternary and Ordovician) of these aquifers are affected by the human activity. Intensive water consumption has caused a fall in the water level in these aquifers. Due to oil shale production the concentration of Ca2+, Mg2+, SO4 2- and Cl- contained in the groundwater from the Ordovician deposits is noticeably higher than in the water with a natural background level. The natural water chemical regime is restored at the cessation of mining.

Test of Airborne Geophysics for Mapping Oil Shale Mining Area in Kohtla-Järve, NE Estonia

2002 ◽  
Author(s):  
H. Vanhala ◽  
T. All ◽  
T. Huotari ◽  
V. Kattai ◽  
P. Lintinen
Keyword(s):  
Oil Shale ◽  
Mining Area ◽  
Airborne Geophysics ◽  
Oil Shale Mining

Integrated ecological risk assessment of heavy metals in an oil shale mining area after restoration

2021 ◽  
Vol 300 ◽  
pp. 113797
Author(s):  
Tengfei Ma ◽  
Hanjin Luo ◽  
Kaibo Huang ◽  
Yan Pan ◽  
Ting Tang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Oil Shale ◽  
Mining Area ◽  
Oil Shale Mining

The reclamation of the North Estonian oil shale mining area

2007 ◽  
pp. 387-401 ◽  
Author(s):  
Krista Lõhmus ◽  
Ain Kull ◽  
Jaak Truu ◽  
Marika Truu ◽  
Elmar Kaar ◽  
...  
Keyword(s):  
Oil Shale ◽  
Mining Area ◽  
The North ◽  
Oil Shale Mining

scholarly journals EVALUATION AND STANDARDIZATION OF ESTONIAN OIL SHALE QUALITY CHARACTERISTICS

1997 ◽  
Vol 1 ◽  
pp. 47
Author(s):  
Heino Aruküla
Keyword(s):  
Oil Shale ◽  
Power Plants ◽  
Carbonic Acid ◽  
Construction Materials ◽  
Calorific Value ◽  
Quality Characteristics ◽  
Industrial Oil ◽  
Processing Plants ◽  
Important Quality ◽  
Oil Shale Mining

The most important mineral wealth of Estonia is oil shale, which is used as fuel for generating electricity, thermal energy, for producing the shale oil, impregnation oil, cement, concrete and other products.Estonian oil shale (Kukersite) deposit occupies an extensive territory (about of 1830 square km). Proved reserves in this deposit were estimated' about 4 billions tons of bil shale. (Fig. 1). The industrial oil shale seam (thickness 2,5 - 3,2 m) contains 6 "oil shale' layers (A - F2) which are separated from one other by limestone intercalation poor in kerogene. The calorific value of oil shale layers ranges between 7-15 MJTkg. The bedding depth of oil shale deposit is from a few meters up to 150 m, now maximum depth in mines are about 70 m. At present oil shale mining is carried out in 6 mines and 3 opencast, oil shale output was 14,6 million tons in 1996.The most important quality characteristics of oil shale are: calorific value Q, moisture W, ash content A, carbonic acid content C02, which have influence on efficiency of using oil shale in power and thermal processing plants and construction materials production. Therefore it is important to elaborate standards of oil shale quality, characteristics and investigate how to guarantine the required for consumers stable quality of oil shale. Checking necessary number of samples from mines, opencasts, power plants and. other consumers, evaluating precision of sampling and determination of quality characteristics is also important.

scholarly journals ENVIRONMENTAL IMPACT OF MINE BLASTING

1999 ◽  
Vol 1 ◽  
pp. 213
Author(s):  
Tonu Tomberg ◽  
Arvi Toomik
Keyword(s):  
Oil Shale ◽  
Ground Vibration ◽  
Mining Area ◽  
Underground Mines ◽  
Vibration Velocity ◽  
Charge Weight ◽  
Opencast Mines ◽  
Oil Shale Mining ◽  
Vibration Parameters ◽  
The Impact

The blasting is the predominating method o f breaking rocks in various surface and underground mines. At the same time some damaging impacts on environment are evident: noise, gas, dust, flyrock and ground vibration. The last factor is most important for safety o f constructions, buildings and various natural objects in the vicinity o f mining area. The ground vibration parameters, crucial for safety o f endangered objects have a significant correlation with charge weight and distance o f blasting. The properties o f vibration medium impact on the value o f these parameters. This study tried to associate the main vibration parameter, particle velocity with blasting parameters and properties o f vibration medium. The blast vibrations were studied in the soil o f Quaternary sediments and in Ordovician limestone in Estonian oil shale mining area in opencast and underground mines. The analysis o f measured data pointed significant correlation between vibration velocity and scaled distance from charges. The formulas and nomographs for prediction o f vibration velocity and fo r maximum permitted charge weights were elaborated fo r basic rocks and fo r soil, fo r oil shale underground and opencast mines. Using these formulas and nomographs in blast design will make possible to diminish the impact o f mine blasting on the objects located in the vicinity of mining area.

Survival of black alder (Alnus glutinosa L.), silver birch (Betula pendula Roth.) and Scots pine (Pinus sylvestris L.) seedlings in a reclaimed oil shale mining area

2010 ◽  
Vol 36 (4) ◽  
pp. 495-502 ◽  
Author(s):  
Tatjana Kuznetsova ◽  
Katrin Rosenvald ◽  
Ivika Ostonen ◽  
Heljä-Sisko Helmisaari ◽  
Malle Mandre ◽  
...  
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
Betula Pendula ◽  
Oil Shale ◽  
Alnus Glutinosa ◽  
Mining Area ◽  
Silver Birch ◽  
Black Alder ◽  
Betula Pendula Roth ◽  
Oil Shale Mining
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