POLYTECHNIC UNIVERSITY OF TIRANA Faculty of Geology and Mines, Department of Earth Sciences APPLICATION OF IP/RESISTIVITY “REAL SECTION” TECHNIQUE IN SEARCH FOR SULPHIDE MINERALIZATION IN SERBO – MACEDONIAN MASSIF, KOSOVO Prof.Dr. Përparim Alikaj Dr. Altin Karriqi Dipl. Eng. Erjon Collaku

GEOLOGICAL SETTING OF THE STUDIED AREA The Orllan property is located in the south-western part of the Lece Magmatic Complex (LMC) in Eastern Kosovo. The LMC is part of the Serbo-Macedonian-Rhodope province of the Tethyan Metallogenic Belt. Beginning in the Cretaceous, the region has been a part of the convergent margin of the Eurasian plate, experiencing a series of Late Cretaceous to Miocene subduction and collision events interspersed with syn- and post-orogenic extension. The main known mineralization occurrence in LMC is porphyry copper with presence of gold and other associated elements. Only about 3 km southeast of the exploration grid of Orllan license is located the Tulare Porphyry Orefield (in Serbia), which used to belong to Avala Resources Ltd and Dunav Resources Ltd (Fig.1). Kiseljak and Yellowcreek are the main gold-copper porphyry deposits in this region. The Kiseljak deposit is a typical calc-alkaline gold-copper porphyry deposit, forming a north plunging (~70°) pipe intruded into amphibolite and biotite schist country rock (Arnold & Malhotra 2014). The alteration zones at Kiseljak appear to be restricted in extent, in contrast to well-developed concentric zonations more typical of high level porphyries.

around Exploration License 1403 Regional geology map with ore fields around Exploration License 1403 (Courtesy of Dunav Resources ltd.)

Geological map of property with IP/Resistivity survey lines

WHAT IS IP/RESISTIVITY “REAL SECTION”? “Real Section” is an Electrical Tomography of Induced Polarization and Resistivity parameters obtained according to an original technique innovated by myself in Albania in 1978 and successfully implemented in Canada in 1991. “Real Section”, markedly improved recently through terrain correction and the shape of current lines distribution in section can be considered as an “Physical Inversion” of geoelectrical parameters which accurately determines the spatial attitude of underground targets. “Real Section”, used with Gradient array and Schlumberger Soundings has detected copper sulphide mineralization down to depth 550 m in Perlat, Mirdita district, Albania and down to 900 m in Potter mine, Ontario, Canada. The most important discovery with “Real Section” technique belongs to San Nicolas giant polymetallic ore deposit in Zacatecas state, Mexico in 1997, consisted of over 100 million ton, at depth 200 m.

IP ANOMALY OBTAINED IN PLAN IN SAN NICOLAS ORE DEPOSIT, ZACATECAS, MEXICO A distinct chargeability anomaly was obtained with a gradient array survey in 1997 over an area of 500 m x 500 m in San Nicolas, Zacatecas, Mexico (Minera TECK).

IP/Resistivity “Real Section” on L 4+00S over the central part of San Nicolas ore deposit The drill SAL-25 located at the centre of the chargeability anomaly intersected 175 m of massive sulphides starting at a depth of 200m. A total massive sulphide amount of over 160 million tons was discovered.

The drill SAL-25 located at the centre of the chargeability anomaly intersected 175 m of massive sulphides starting at a depth of 200m. A total massive sulphide amount of over 160 million tons was discovered. IP/Resistivity “Real Section” on L 4+00S over the central part of San Nicolas ore deposit

IP “Real Section” Potter Mine, Ontario, Canada

PHYSICAL INVERSION OF IP “REAL SECTION” LINE 0, ORLLAN - KOSOVO

PHYSICAL INVERSION OF RESISTIVITY “REAL SECTION” LINE 0, ORLLAN - KOSOVO

The borehole BER-1 intersected an interesting geological section, with similarities to the one of Tulare Cu-Au porphyry deposit, although with low grades of Cu and Au but important for Zn and Ag. The geological formations include gneiss of various alterations, including brecciation and kaolinization, andesite of different rate of alteration, as well as quartz veins (stockwork) of thickness from millimeters to half a meter. Sulphides (mostly pyrite) with grade from trace to several percent, and texture from disseminated to thin veins were also intersected, especially below the depth 250 m. The hole has remained in mineralization, so deeper holes would be needed in future.

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