Best practices in gas outburst management World Mining Congress Astana 20.06.18 Thomas Imgrund, Alexey Shalashinski - Achtung, Folientest, nicht ...
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Achtung, Folientest, nicht für den Produktiveinsatz geeignet
Best practices in gas outburst
management
World Mining Congress
Astana 20.06.18
Thomas Imgrund, Alexey Shalashinski
04.07.2018 Folie 1 DMT-Präsentation
Achtung,
Initial geological Folientest,
conditions and nicht für den Produktiveinsatz
gas content geeignet
exploration methods
(1 of 2)
Country / Germany Russia Australia Kazakhstan China USA
parameter
Typical 1000 - < 800 m < 600 m < 800 m < 1000 m < 700 m
depth of 1500 m
mining
Permeability Low Low Medium to Low Low to high Medium to
high high
Gassy Mostly Coking coal Coking Coking coal Coking coal Coking coal
seams gassy, 8-20 seams coal seams seams seams
internsity, m3/t gas mostly seams mostly mostly mostly
typical virgin content gasssy, up mostly gasssy, up to gasssy, up gasssy, up
gas content to > 20 m3/t gasssy, up > 20 m3/t to > 20 m3/t to 10 m3/t
to 15 m3/t
04.07.2018 Folie 2 DMT-Präsentation
Achtung,
Initial geological Folientest,
conditions and nicht für den Produktiveinsatz
gas content geeignet
exploration methods
(2 of 2)
Country / Germany Russia Australia Kazakhstan China USA
parameter
Fault High High Low to High High High
intensity medium
Gas content Yes core Yes core Yes core Selective, Yes core Yes core
testing sampling sampling sampling chip sampling sampling
during and chip sampling
exploration sampling
Gas content Yes in gas No lab Yes in gas Partly, in Selective or Selective or
measureme outburst risk testing, re- outburst risk implemetati none none
nt during zones calculation zones on
mining of CH4 before and
concentratio after gas
n in pre-
ventilation drainage
04.07.2018 Folie 3 DMT-Präsentation
Achtung, Folientest, nicht für den Produktiveinsatz geeignet
Mining methods and gas drainage practices (1 of 2)
Country / Germany Russia Australia Kazakhstan China USA
parameter
Typical Longwall > Longwall Longwall Longwall Longwall Longwall
mining 250 m 200-400 m, and R&P 200-250 m 250-300 m and R&P
methods few R&P mixed mixed
mines
Multi-seam Yes, up to Yes up to 4- Very rare Yes, typically Yes multiple Rare
mining 10 seams in 5 seams 2-3 seams seams
one block
Thick seam Not Mostly If yes, Slicing Mixed Not
mining slicing LTCC slicing and
methods LTCC
04.07.2018 Folie 4 DMT-Präsentation
Achtung, Folientest, nicht für den Produktiveinsatz geeignet
Mining methods and gas drainage (2 of 2)
Country / Germany Russia Australia Kazakhstan China USA
parameter
Gas pre- UG straight UG straight From UG straight UG straight From
drainage or surface or or directional surface or
methods directional UG UG
(rare) directional directional
Obligation No Yes, if gas Yes, if No No No
of gas pre- content > gas
drainage 12 m3/t content >
TLV
(usually ~
9 m3/t
CH4)
Gob From UG From From From surface From surface From
drainage surface surface and UG surface
and UG and UG
04.07.2018 Folie 5 DMT-Präsentation
Achtung, Folientest, nicht für den Produktiveinsatz geeignet
Regulations and mine planning
Country / Germany Russia Australia Kazakhstan China USA
parameter
Assesment Generally based Based on Based on Based on Based on gas No gas
of gas on gas content, general measured depthfor entire pressure, coal outburst risk
outburst faulting and practice and gas content seams strength, gas recorded
risk abutment depth of and faulting emission rate
pressure, mining, and tectonic
subject to general and structures,
individual subjective strictly
assesment regulated
Assesment Outburst Based on Definier by Based on Generally None
process guideline, final regulations operator in regulations prescribed by
consensus and made by outburst and made by regulations
reached by the prescribed management prescribed
mine, mining bodies (till plan agreed bodies
authority and 2017) with the mine
independent inspectorate
expert
Assesment Multiple Empirical Gas lab Empirical Empirical None
tools software, gas formulas, formulas, gas formulas, many
lab, gas geoacustics, lab (initial methods are
monitoring, drill drill results trials) ried
results
04.07.2018 Folie 6 DMT-PräsentationAchtung, Folientest, nicht für den Produktiveinsatz geeignet
Key features of successful gas outburst management
• Priority in gas outburst management is (1) prediction, (2) prevention and (3)
protection.
• Prediction covers risk assessments prior to mining. Focus should be on
most relevant factors: gas content, coal structure, abutment pressure.
• Prevention covers the elimination of actual gas outburst hazard and has to
consider local geological conditions. Successful pre-drainage and
protection seam mining eliminates high gas contents as the key factor.
Relaxation drilling is used where reduction of gas content is not doable (low
perm coal) and targets the local reduction of gas pressure. Smart procedures
of relaxation drilling allow maximizing safety and advance rates and
minimizing operational expenditures.
• Protection covers various safety measures being required if protection fails.
People are removed from face during any major impact on coal (remote
controlled heading and drilling) and have access to breathable air (O2
self rescuer and emergency air breath supply). Explosion protection is
required in zones where the explosive range is possibly crossed.
04.07.2018 Folie 7 DMT-PräsentationAchtung, Folientest, nicht für den Produktiveinsatz geeignet
DMT project references
• Advise to operators of gas outburst mines in Germany, Mexico,
Kazakhstan, Russia, Australia and New Zealand - with long term
involvements. DMT’s service covers investigations of gas outbursts,
reviews and audits, risk assessments, training, implementation of
short and long term strategies of prediction, prevention and
protection. DMT holds international and long term experience with
respect to high gassy and low permeable coal seams.
• Gas lab to measure CH4 content on a short term basis and in mass
– technology proven in Germany and implemented in Turkey,
Mexico and Kazakhstan – very useful in mining environment with
rapidly changing gas content (e.g. multi seam mining).
• Analysis of gas outburst and degassing mechanisms is done
case by case, supported by state of the art modelling tools (e.g.
GEDRU, FLAC, SimedWin). This allows the selection of most
effective measures of prediction and prevention and considers the
actual local mining conditions.
04.07.2018 Folie 8 DMT-PräsentationAchtung, Folientest, nicht für den Produktiveinsatz geeignet
The future
• Geohazmap Coal – 4D geotechnical risks
modelling is currently implemented as pilot project in
Russia.
• The systems allows effective management of big data,
transparent assessment and real time visualization of
coal mine related risks, effective mine planning and
alerting. Both, data and knowledge driven approaches
are possible.
• Information has no value if not being accessible and
used. Geohazmap Coal addresses the fact that much
data is gathered during exploration and mining without
being considered in risk assessments.
• The identification of simple-to-manage areas (pre-
drainage or protection seam mining possible) and
hard-to-manage areas (local relaxation and/ or remote
heading required) is easy. Execution of appropriate
measures can be triggered in time.
04.07.2018 Folie 9 DMT-PräsentationYou can also read
