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

Fig. 2. View of the final contour of the open pit Veliki Krivelj up to the elevation k-100 m<br />
(3D review)<br />
Copper ore from the open pit Veliki<br />
Krivelj is processed in the Flotation Plant<br />
Veliki Krivelj Great, whose current capacity<br />
is 8.5 million tons of ore.<br />
Increasing the capacity of the Flotation<br />
Plant to 10.6 million tons per year includes<br />
the following processes:<br />
- secondary and tertiary crushing with<br />
screening to the size range of 100%<br />
- 16 mm,<br />
- two-stage grinding in bar and ball<br />
mills with one-stage sizing in hydrocyclones<br />
to the size-range of 55 to<br />
60%, size class -0.074 mm,<br />
- primary ore flotation with additional<br />
grinding of primary and control concentrate<br />
to the size range of 85%<br />
- 0.074 mm and three-stage cleaning,<br />
- dewatering the final copper concentrate<br />
in the process of thickening and<br />
filtration to the moisture content of<br />
10%, and<br />
- disposal of tailings.<br />
Increasing the capacity of ore mining<br />
and processing from the current 8.5 million<br />
tons to 10.6 million tons at yearly<br />
level inevitably requires and provides the<br />
spaces for disposal of flotation tailings. At<br />
present, about 48.5 million m 3 of tailings<br />
could be deposited at the flotation tailing<br />
dump Veliki Krivelj, and that is the time<br />
limited to the beginning of 2015.<br />
Since the area of the Krivelj River valley<br />
is, for now, the only real, long-term<br />
disposal site for the flotation tailings from<br />
the Flotation Plant Veliki Krivelj there is a<br />
need to maximize the spatial opportunities<br />
provided by the Krivelj River valley.<br />
After filling the remaining space of the<br />
Veliki Krivelj flotation tailing dump, it is<br />
technologically possible to expand the<br />
Veliki Krivelj tailing dump upstream in<br />
the direction of the Open Pit Veliki<br />
Krivelj and transport system for waste by<br />
construction a new Dam 4. The new dam<br />
will also form a new accumulation Field 3<br />
upstream of the existing Dam 1, Figure 4.<br />
No 4, 2011. 60<br />
MINING ENGINEERING