Štitovo II

Štitovo II deposit of bauxite ore is located in north – east region of Nikšićka Župa, on carbonate platform of Štitovo. The altitude of the deposit ranges between 1460 and 1500m. The relief of the narrow area of deposit is marked by Zamršten hill.

Its distance from Štitovo I deposit is 500m, south-eastward.  Štitovo II deposit connects with Nikšić by 34 km long road, out of which 29 km is a tarmac road.

Geological structure

Štitovo II deposit consists of limestones, dolomite, dolomitic limestones, glacial deposits and red bauxite. Carbonate sediments of upper Triassic, which are located across the deposit, belong to rhaetian deposits. They form the immediate shelf and margins of the deposit. They are represented by white and reddish crystalized limestones, banked and massive ones, with frequent fossil residues of megalodon. During continental phase, from Rhaetian period to Teton, karstification of Triassic rocks occurred, causing rugged relief of the shelf with caverns, cracks, etc. Red bauxite ore occurs at several points within this deposit as naturally and artificially disclosed profiles. Bauxite is compact, mulberry and at certain places exhibiting pisolitic structure. In bauxite tops, there are yellow bauxite clay, thick up to 25 cm.

According to its size, Štitovo II deposit belongs to large red bauxite deposits, however, due to high composition of SiO2 – it has a secondary importance for Aluminium industry. This deposit consists of two ore bodies, mutually separated by faults and paleorelief, marked as primary (indigenous) and secondary (allochthonous).

Quality of bauxite

The mineral composition of primary bauxite in Štitovo II deposit is: 58,85% boehmite, 26,73% kaolinite, 18,08 % hematite, 2,45% calcite and 2, 74% anatase. It has been proven the existence of the following accessory minerals: pyrite, marcasite, zircon, ilmenite, quartz, rutile, pyroxene, amphibole, biotite, chlorite. It also shows the findings of geo-chemical research.

Volume mass of bauxite of this deposit is 2,73 t/m3. However, bauxite from Štitovo II deposit, due to weaker chemical composition, cannot be processed by this technology on their own and be rentable at the same time. In Bauxite Mines – Nikšić, this problem was solved by adding certain proportion of the ore from Štitovo II deposit to the high – quality ore from other deposits (mainly Zagrad deposit), hence the mixture had a composition of SiO2 of 5,5 to 6,0%.

Bauxite reserves

Last calculation of red bauxite reserves in Štitovo II deposit has been carried out within the Study on classification, categorization and calculation of red bauxite reserves in Nikšićka Župa deposits: Zagrad, Biočki stan, Đurakov do, Štitovo II and Borovnik, status on 31 December 2006, using a method of parallel vertical profiles. The deposit has a high degree of exploration (A:B:C1=28%:50%:22%). The study has not been certified by competent Ministry.

 Primary deposit part

Category Balance geological reserves Al2O3 SiO2 Fe2O3 TiO2 CaO Other
A 1 298 666 53,12 12,62 18,62 2,58 0,30 12,72
B 2 162 375 52,68 12,89 18,76 2,48 0,42 12,17
C1 699 114 54,25 12,43 18,86 2,53 0,41 12,73
A+B+C1 4 160 155 53,08 12,72 18,73 2,51 0,38 12,26


 Secondary deposit

Category Balance geological reserves Al2O3 SiO2 Fe2O3 TiO2 CaO Other
A - - - - - - -
B 105 518 56,15 7,96 20,16 2,80 0,27 12,22
C1 327 042 56,58 7,49 20,10 2,80 0,26 11,96
A+B+C1 432 560 7,60 20,11 12,73 2,80 0,26 12,02


Total

Category Balance geological reserves Al2O3 SiO2 Fe2O3 TiO2 CaO Other
A 1 298 666 53,12 12,62 18,62 2,58 0,30 12,17
B 2 267 893 52,84 12,66 18,82 2,49 0,41 12,17
C1 1 026 156 54,99 10,85 19,25 2,61 0,36 12,48
A+B+C1 4 592 715 53,39 12,24 18,85 2,54 0,36 12,23