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RESEARCHES IN THE PHASE OF EXPLOITATION OF THE ORE BODY CUKAR 2 EAST IN FUNCTION OF INCREASING LIFETIME OF THE BUCHIM COPPER MINE, EASTERN MACEDONIA
Abstract
The Cukar 2 east ore body represents the latest explored ore body within the Mucim Mine with possibilities to enter exploitation stage in near fututre. Calculated ore-bearing coefficient in the Cukar 2 east ore body was 0.40%, meaning that within the ore body boundaries 60% of mass is not mineralized somehow, which is compatible with remaining three ore bodies within the Buchim porphyry copper mine. The calculated value of variation coefficient (V) has shown value of 71.39% that is in the range of 43-100%, which displays that this ore body belongs to the third group of deposits with uneven polymetallic mineralization. An average copper and gold concentrations were determined as 0.206% Cu and 0.165g/t Au, respectively. Minimal economic content (MEC) within the VrпїЅnik ore body, as represent of this kind of mineralization, was determined as 0.211% Cu. In similar manner was calculated the lowest copper boundary (cutoff grade), which have shown value of 0.141% Cu and thus allowing certain decrease of contents in exploited ore. Also, there were calculated so called copper monometal values, which included influence of the present gold and silver in the ore. Calculated copper monometal was set at relatively fair 0.254% Cu that represents solid mainstay for exploitation of copper in these low percentage ores. Calculated ore reserves in this particular ore body were 27 161 276 t of ore with 0.206% Cu and 0.165 g/t Au and increased mine life for additional 5.2 years.
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