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The aim of this paper is to evaluate the suitability of a coal sample from the mine CSA for bacterial leaching. Laboratory research used a pure bacterial culture of Thiobacillus ferrooxidans . The results showed that bacterial leaching was effective, with a one month leaching time, when 68\% of total sulphur and 68\% of pyritic sulphur was leached. The paper describes changes to the pyrite during and after bacterial leaching.

Titanium; the ninth mose abundant element, occurs in nature mainly as ilmenite (95\%) and rutile (5\%). Ilmenite is an economically important mineral. Ilmenite forms as a primary mineral in mafic igneous rocks and is concentrated into layers by a process called “magmatic segregation”. It crystallises out of magma relatively early before most of the other minerals. As a result, the heavier crystals of ilmenite fall to the bottom of the magma chamber and collect in layers. It is these layers that constitute a ri...

This paper presents the results of magnetic separation tests for the recovery of colemanite from the ore and the tailings produced in Kestelek (Turkey) Processing Plant. Crushed ore (30.76\% B2O3) and tailings (31.76\% B2O3) samples were wet screened and classified into different size fractions. Size fractions coarser than 75 $\mu$m were subjected to three-stage magnetic separation using a high intensity permanent magnetic separator. The mineralogical composition of the ore and the tailings appears to enable gangu...

According to the valid Slovenian legislation the mineral raw materials are numbered among the natural resources that are part of natural goods important for satisfying Man’s material and spiritual needs and interests ( Art. 5 of Environment protection law). In this sense the mineral raw materials represent a specific category of goods that are not free to be appropriated by somebody. They are the ownership of the state, and they can be extracted only under a special permission – the concession. The ownership o...

With organizing the excavation tehnology of loose raw materials through the boreholes, considering the complexity of technological operation, the most important thing is to calculate technical-technological parameters of exploitation and to make an optimal selection of pump aggregate, pipe line and pulp line, and also to project and construct the equipment for drilling and obtaining of concrete deposit conditions since there is no serial production. Hydromonitor presents its most important part that forms and dire...

In this study, the mineralogical properties and the amenability of Mastra (G\"um\"uşhane-Turkey) gold ore to gravity recovery using a Knelson Concentrator were examined. The mineralogical analysis of the ore has shown that gold occurs as particles of 1-300 mm in size. In the gravity tests performed on the ground ore (-74 •m) a concentrate containing 771.95 g/t Au was produced at 47.15 \% recovery and 1.58\% yield. Enrichment ratios of Au, Ag, Cu, Pb, Zn, Ni and As were found to be 29.7; 16.7; 2.9; 1.58; 3.15; 1...