Institut za rudarstvo i metalurgiju Bor

is very abundant feeding aquifers. According
to literature data for the limestones
effective infiltration of rainfall may
amount to 70%. Drainage of aquifer is
done by the edge of basin over the aquifers
the “Bezdan”, “Prkos”, “Debela
česma”, and in the zone of open pit over
the aquifer “Tvrdaš”, periodical aquifer
“Kutlovača” where the limestone is oped
by the mining works. After the formation
of landslides in the zone of aquifer
“Tvrdaš“, the source is now over the former
place of posting, and lower part of
expired water is connected to a ware fall.
Continuous measurements of yield were
not performed, but the maximum for the
aquifer “Tvrdaš“ is 490 l/ “Kutlovaču”
750 l/s (in 20.11.1985. after extreme rainfalls
18.11.1985. of 123.5 mm/m 2 ). Minimum
yield of aquifer “Tvrdaš” is estimated
to 30-40 l/s and on the basis of high
yield, the aquifer “Tvrdaš” belongs to the
third group with capacity of 0.1 to 1.0
m 3 /s.
Rock mass of the basin have the fracture-cavernous
porosity, with a combination
of differently oriented cracks and
faults, and integranular porosity, where
super capillary porosity prevails. Based on
the filtration characteristics of the respondents
completed the division of hydrogeological
collectors, hydro-geological
and hydrogeological complex insulators.
Hydrogeological collector consists of
limestones and alluvial deposits, and
marls and coal series belong to the HG
complex, and hydrogeological insulators
are substratum marly and coal clays[1].
Filtration characteristics of limestone
are very inhomogeneous and depend on
the degree of fracture and degree of carstification.
Filtration characteristics are most
familiar in the northeastern part of the
open pit “Potrlica”. Hydrogeological drilling
in limestone is at depth of 104 m
where good permeability is noted. By the
VDP examination during the construction
of arch dam “Durutovici” and making in
injection curtain on drill holes, the me-
dium and large vodoprovodnost water
permeability was determined K = 1.75 x
10 -5 ÷ 4.30 x 10 -6 m/s. Waterpermeability
of limestone in the right side of the dam is
over 60 l / s. The drilling depth of 45-100
m, which is used to observe the effects of
the injection curtain in different intervals
at different depths VDP experiment is not
done because of the existence of fissures
and caverns in which they lost water. The
obtained Kf ranges from 1.61 x 10 -7 ÷
9.68 x 10 -5 m/s, and lower values are for
deeper intervals. In general, the value of
Kf = 3.5 x 10 -6 m/s could be adopted for
limestones.
In marl deposits and coal series, the
filtration characteristics per depth often
change, depending on the local fracture
and fault zone, and range from good water
permeable to waterproof, which puts them
in hydrogeological complex. Generally,
the roof marls may zone from good water
permeable, poor waterproof and waterproof.
In the eastern part of the basin at
Durutovići, to a depth of 30 m, the marls
are characterized with good water permeable
characteristics, although most of the
roof marls have poor water permeable
characteristics, and in the central part of
the basin at depths over 30 m, the marls
are waterproof, with coefficient of filtration
less than 1 x 10 -7 m / s.
For the coal series are characteristic
variables filtration characteristics according
to the degree of fracture and breaking.
In the areas of developed cracks and in the
flexure zone (edge of the basin) the good
water permeable characteristics are expressed,
while the majority of tested drill
holes, the coal is poor to medium water
permeable. Locally, the coal shows good
permeable characteristics, Kf = 1.46 – 7.77
x 10 -6 m/s.
Immediately near the river Ćehotina ,
the gravel, partly sandy and clayey, are
prevalent.Filtration characteristics of the
alluvial deposits are empirically calculated
and characterized with good water permeability
Kf = 2.87 ÷ 6.57 x 10 -2 m/s.
No 1,2010. 97
MINING ENGINEERING