Title: RISK ASSESSMENT OF GEOLOGICAL CONDITIONS FOR SELECTIVE EXTRACTION OF OIL SHALE IN ESTONIA MINE
1RISK ASSESSMENT OF GEOLOGICAL CONDITIONS FOR
SELECTIVE EXTRACTION OF OIL SHALE IN ESTONIA
MINE
- S. Sabanov J.-R. Pastarus
- Tallinn University of Technology, Department of
Mining, Estonia - O. Nikitin A. Viil
- Estonian Oil Shale Mining Company, AS Eesti
Põlevkivi, Department of Development, Estonia
2Objectives
- The aim of the study is to determine aspects of
selective extraction which suit for geological
conditions in Estonia mine - The results will be use for other mines according
with geological conditions and supplying
technology
3Schematic geologicalsection of the oil shale bed
in mining block 3104 Estonia mine
Immediate roof
Depth of excavation H63 m Extraction thickness h
2.8 and 3.8 m Compressive strength oil shale
20 40 MPa limestone 40 80 MPa Volume
density oil shale 1.5 1.8 Mg/m3 limestone 2.2
2.6 Mg/m3
Commercial oil-shale bed
4Selective mining
Go to backfill 79 of limestone
IV
Go to backfill 63 of limestone
III
II
Go to backfill 86 of limestone
I
B C 13 limestone
Extraction 2
A B C limestone 27
A A1 52 limestone
Extraction 1
5Limestone from seams goes to enrichment
6For all geological condition and all type of
roadheaders
(Roaheader application in mining and tunneling
industries H. Copur, L. Ozdemir, J. Rostami)
UCS Uniaxial compressive strength, ICR-
Instantaneous cutting rate
7Event tree for variant 1 of selective extraction
8Event tree for variant 2 of selective extraction
9Conclusions
- Selective extraction allows reduction of rock
mass volumes during the loading, transportation
and enrichment processes. Thus, about 25 of the
limestone accompanying the extracting processes
will be left in the mine for backfill in the
excavated areas. Such a way of development will
considerably reduce storing of rock waste on the
ground surface and decrease harmful influence on
the environment. - Preliminary calculations have shown
sustainability of selective extraction for the
room and pillars method under the geological
condition of Estonia mine
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