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Location: 3 km W from Stratoni, Greece
23A Vas.Sofias Ave. (and N.Vamba 2)AthensGreece10674
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The Stratoni polymetallic ore consists of stratabound replacement mineralisation hosted within marble horizons and may be termed a distal skarn. The mineralisation was emplaced by hydrothermal fluids driven by a granodioritic intrusive which was intruded some 30 million years ago. The mineralised zone is often referred to as the Stratoni-Piavitsa belt, and the total sulphide content of this belt prior to mining has been estimated at 25Mt. The deposits consist of massive sulphide carbonate and aplite replacement, restricted to two Marble horizons, interlayed with biotite gneiss and schist. The model therefore requires two components; marble horizons that have been thickened and structurally prepared by thrusting and folding prior to the introduction of mineralising fluids and; a structural architecture which has allowed the channelling of fluids from a magmatic source to the chemically reactive marbles. Exploration uses these two elements as a guide to identifying potential new ore zones. The massive sulphide mineralisation has a relatively simple mineralogy, and the most abundant ore minerals are pyrite, sphalerite, galena, arsenopyrite and chalcopyrite. The dominant exploited minerals historically have been sphalerite, pyrite and galena; the ore is often abbreviated to BPG from the old notation blende, pitch, galena. The ore is also gold bearing, mostly associated with the arsenical pyrite and arsenopyrite. Quartz, calcite and minor rhodochrosite form the gangue minerals.The mineralisation is hosted either in the marble or replacing aplite as irregular and sub-parallel layers of sphalerite, pyrite and galena. These lenses occur from footwall to hanging-wall, varying from few centimetres to tens of metres. Galena is seen as the most deformed mineral, commonly re-crystallised into coarse grains. Galena also exhibits curved cleavage and elongated and foliated grains. Zonation of the sulphides is not clear.The Mavres Petres orebody is some 500 metres in strike length, between 100 and 340 metres in dip extent. The true width is on average 25 metres. The strike of the orebody is close to east west and the dip is 30° to the south.The Mavres Petres orebody shows an average gold grade of around 4 to 6 g/t Au. Its presence is strongly associated with the arsenical pyrite and arsenopyrite, which appears to be a different stage of mineralisation within the matrix of hydrothermal breccias or in veins cutting the Pb-Zn sulphides. The gold mineralisation is not coincident with the massive sulphide mineralisation. The gold is completely refractory and not considered to be of any economic value.
