Institut za rudarstvo i metalurgiju Bor

directly used to drive power plants as well
as industrial heating purposes. Also, there
are various conversion and obtaining liquid
hydrocarbons.
In the process of purification of gas,
the followings are obtained: phenols, ammonia,
benzenes, and many other products,
while pure sulfur is easily produced
from sulfur hydrogen. [4]
CONCLUSION
The Aleksinac deposit of coal and oil
shale is one with very complex geological
structure, the limiting elements for the
implementation of mining methods and
technology, like long wall mining metod
and mechanized mining technologies.
The number of investigated technical
parameters necessary for designing production
systems and underground mining
construction, this deposit belongs to a
group of under-explored deposits.
This fact was established through
analysis of available technical documentation
and cause many difficulties and leads
to unreliable assessments and forecasts of
technical size and also requires the necessary
research work environment, in the
initial period of reconstruction of the mine.
After closing the Aleksinac mine,
through the remaining balance and offbalance
reserves of 27.5 million ton of
quality lignite coal. From the world of
industrial experience with the UCG is
known that the efficiency "attacked" the
layers of coal 72-96%. If the count with
only 80% of such usage, it remains an
open view to using the UCG in Aleksinac,
will benefit around 22 million tons of coal.
The existence of oil shale, directly adjacent
to coal, permitted to increase the
efficiency of the process of UCG. Namely,
the heat loss from the process of UCG on
overlie of layers will produce additional
hydrocarbon gases and liquids. Most of
these liquids will produce additional
cracking of hydrocarbon gases. Such com
bined of hydrocarbon gases getting from
oil shale, increases the thermal power of
the gas obtained from UCG, and allows
obtaining a certain quantity of oil, as well
as by-products in this process.
In order to achieve the production based
on already proven geological reserves, it is
necessary to continue to research ways of
obtaining synthetic oil from oil shale, with
the consultation of foreign companies,
whose experience and gained technology
in this area is still unsurpassed. It must be
borne in mind that the realization of the
exploitation of these resources is limited,
as content of oil fractions, which dictates
the technology, space requirements and
conditions related to the environment, particularly
in achieving the profitability of
individual deposits, while essentially
breakeven depends of oil prices on the
world market, which would be the conditions
of our deposit had to be significantly
higher over a longer period of time. That
still means that this resource deserves attention
and study as an alternative energy
potential.
In the case of the Aleksinac deposit, in
addition to regular distribution useful and
harmful components, a decisive influence
on economic exploitation will slope and
depth of layers, i.e. morphological characteristics
of ore bodies. Of course, specific
analysis is needed to make the exploiting
useful materials and large amounts of oil
shale that are under very populated places
(Aleksinac, Subotinac, Vakupac, etc.) In
these parts of deposits, so called the protective
pillars, the process of UCG may
represent the most optimal solution.
Quantities of about 3.8 billion bituminized
marlon, that overlies the oil shale,
with about 4-5% organic matter, may also
be subject to special investigations, and
future time will show whether they can be
treated together or separately for the oil
shale.
No 1, 2010. 55
MINING ENGINEERING