Institut za rudarstvo i metalurgiju Bor

COMMITTEE OF UNDERGROUND EXPLOITATION OF YU ISSN: 1451-0162
THE MINERAL DEPOSITS UDK: 622
UDK: 622.271(045)=20
Radmilo Rajković*, Daniel Kržanović*, Dejan Mitić*
QUANTITY OF WATER AND PUMP SYSTEM FOR DRAINAGE AT
THE OPEN PIT OF THE COAL MINE “POTRLICA“ – PLJEVLJA
Abstract
This work shows the effect parameters and quantity of water at the coal open pit mine „Potrlica“
within the Pljevlja Coal Basin. The system of water pumping at the open pit was shown and
its verification was made.
Key words: pump system, water quantity, verification
INTRODUCTION
The coal open pit “Potrlica“ is within
the Pljevlja Coal Basin.
The size of water quantity is under the
largest impact of surface water caused by
the atmospheric precipitation that falls directly
on the area of open pit, the surface
water due to the atmospheric precipitation
from the catchment area from which gravitate
towards the pit and underground water.
The biggest influx in the area of the open
pit is by the groundwater and ranges from 40
and up to 500 l / s. For the area of Pljevlja, the
initial intensity of maximum fifty-year rainfall
is 4.12 mm/min. Maximum quantity of
groundwater and surface water for eight hours
can reach the open pti is 57 000 m 3 .
The average amount of pumped water
from 1991 to 2008. was 10 680 000 m 3 /year.
The system of well and centrifugal
pumps is predicted for water pumping, set
at three locations. Total power system is 2
692 kW. Total geodetic lifting height is
114 m, and maximum water flow through
system is 720 l / s.
* Mining and Metallurgy Institute, Bor
REVIEW AND ANALYSIS OF IN-
FLUENTIAL PARAMETERS
The rainfalls have a continental type of
distribution, maximum in late spring, the
secondary maximum in late autumn and
minimum during the winter. The annual
amount of sediment is 800-1 100 mm and is
one of the lowest in Montenegro. The annual
distribution of monthly rainfalls is uniform.
The average number of days with rainfalls is
144 per year. Number of days per year with
snow cover >1 cm is 67, and height >10 cm
is 32. Snowfalls usually start in mid-
November and ends in mid-April [1].
In the area of coal deposits Potrlica there
are three types of aquifers: compact type,
fracture type and karst type of aquifers [1].
Compact type of groundwater is
formed in the alluvial coat of the river
Ćehotina and dumped waste masses in the
space of inner and outer waste dumps of
the open pit “Potrlica”. Aluvial sandypebbly
sediments have area of 4 km 2 and
the width of Ćehotina alluvion varies
25-600 m. The groundwater level is in
No 1,2010. 95
MINING ENGINEERING