Rudarski radovi br 4 2011 - Institut za rudarstvo i metalurgiju Bor

Table 1. Ore reserves in the active mines of RTB Bor [6]<br />
Mine Ore, t Copper, t Gold, kg Silver, kg<br />
Jama, current operation 7,262,726 70,079 1,727 11,711<br />
Jama, ore body Borska Reka 319,969,179 1,599,846 65,274 518,350<br />
Veliki Krivelj 465,150,392 1,511,726 31,584 180,478<br />
Coka Marin 220,714 4,767 1,307 8,945<br />
Juzni Revir 246,082,778 881,904 46,654 353,684<br />
Cerovo 170,000,000 595,000 11,900 170,000<br />
Total 1,208,685,789 4,663,321 158,446 1,243,228<br />
The most of ore reserves are concentrated<br />
in three deposits – Veliki Krivelj,<br />
Jama (Bor River) and South Mining District<br />
(Majdanpek). Between these three,<br />
most of the copper reserves lay in the ore<br />
body Bor River.<br />
REALIZED PRODUCTION<br />
Until last decade of the last century,<br />
the copper production had a trend of constant<br />
increase, beside minor variations.<br />
The highest production from own ore deposits<br />
was reached in 1988 – 105,390 tons<br />
of copper, while the best results from own<br />
and imported copper ore were obtained in<br />
1990, when 151,395 t was produced in<br />
RTB Bor. From the start of the 90’s, due<br />
to the objective reasons, the production<br />
has fallen rapidly, first in Majdanpek, and<br />
then in the mines in Bor.<br />
Fig. 2. Variation of copper content in the ore<br />
However, the ore reserves have a constant<br />
trend of decrease the metal content in<br />
the ore. It started with 9% at the beginning,<br />
and now it is 0.27%.<br />
The lowest production from own resources<br />
was realized in period between 2003<br />
and 2005, about ten thousand tons of cathode<br />
copper. At the same time, that was the<br />
period of biggest economic crisis in the<br />
company. Starting from 2006, the copper<br />
production has started to recover, to reach<br />
over 21,000 t in 2010, while production<br />
from imported ore decreases to just 963 t<br />
in 2010.<br />
No 4, 2011. 141<br />
MINING ENGINEERING