The main product is a concentrate of limonite iron ores.

Production of iron ore concentrate

From the establishment of the new company until today, on locality Omarska about 38 million tons of raw ore have been excavated, 153 million tons of overburden have been removed, and 28.5 million tons of iron ore concentrate have been produced and shipped. Initially, extraction was carried out from the “Mamuze” and “Jezero” surface pits, and the continuity of production was achieved with the opening of the “Buvač” surface pit in 2008, where the process of iron ore production in the Omarska mine continues today. 

The technology used in ore preparation is based on gravity-magnetic separation of limonite iron ore, with an average quality of 48.70% Fe, 13.30% SiO2 and 16% H2O. Further in the process of washing, crushing, multiple screening, classification on spiral classifiers and hydrocyclones, and treatment of fine classes on high-intensity electromagnetic separators, two commodity products are obtained:

Lump ore concentrate – ARP size -40 +10 mm of average quality
54% Fe, 7.9% SiO2 and 10% H2O.

Fine ore concentrate – BPR
size -10 +0 mm of average quality
51% Fe, 10.50% SiO2 and 14% H2O.

The mutual ratio APR:BPR= 25:75 with a mass recovery of about 75% and Fe recovery of about 81% percent, and in a total amount of about 1.5 million tons per year.

It is important to note that ArcelorMittal Prijedor is constantly working on improving production, which made it possible for the average quality of incoming ore to be lowered from 52.5% Fe in 2004 to 46.8% Fe in 2021, all with the aim of more rational use of ore resources.

Contact us

ArcelorMittal Prijedor d.o.o.

A. J. Raškovića 1.

79 101 Prijedor

Bosnia and Herzegovina

Production of limestone

The limestone mine “Drenovača” is currently engaged in the production of commercial limestone of various fractions: 0-4; 4-8; 8-16; 16-31; 0-31; 31-65 and others, as well as broken stone and scree. The annual production capacity amounts to an average of 120.000 m3, of which 60% refers to stone fractions, and 40% to bulk material. 

We see the application of these fractions in construction and infrastructure. In addition to the production of commercial limestone, we also produce stone dust, which is used for calcification of agricultural land.

The production process itself consists of several technological stages:

This phase is the first and consists of removing surface mechanical impurities and preparing the ground for the smooth movement of machinery.

The drilling and blasting phase is the initial phase in limestone excavation. Blasting with a very small percentage of negative effects gives us positive effects in the following phases of work, because good crushing of the rock mass is easier for loading, transport and crushing.

After drilling and blasting, loading and transport of blasted material is started. The material is loaded with hydraulic excavators (backhoes), at the blasting site, into trucks or dumpers with which the material is transported to the crusher or to the depot.

Crushing of raw stone is done on an impact-rotary crusher, where a buffer of 0-60 mm is obtained from the upper limit coarseness of 1,000 mm, which is deposited in the intermediate stone depot. Grading is done by separating the buffer 0-60 mm from the intermediate depot into fractions 0-22 mm using two vibro screens. In the grading process, the 0-60 mm buffer is screened into the desired fractions by a vibro-screen, by setting the screen surfaces of the corresponding openings.

Shipping is done in such a way that the finished products are loaded into trucks using loaders. Cubing of the loaded mass in the truck is done using the bucket of the loading machine. The annual shipment amounts to an average of 90,000 m3.

It is also important to emphasize that we have material quality certificates, based on reports on laboratory testing of all stone aggregates produced at SP Drenovača, .