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Geology & Mineralization

The Krumovgrad district, which includes the Ada Tepe mine, is located in the Eastern Rhodopes mountain in southeastern Bulgaria. The surrounding prospects, sometimes referred to as satellite orebodies, include Surnak, Skalak, Synap, Kuklitsa and Kupel (see map).

The Ada Tepe deposit is classified as a low sulphidation type epithermal gold-silver deposit and was formed in the Early Oligocene. Gold and silver mineralization in the Krumovgrad district is predominantly hosted near the base of Paleogene sedimentary rocks (Shavar Formation), just above an unconformable shallow fault contacts (listric or detachment) with the underlying metamorphic basement rocks (Kessebir-Kardamos core complex). The sedimentary rocks typically form laterally discontinuous lenses, ranging from chaotic breccias to conglomerates to inter-bedded pebbly sandstones, siltstone, and marl to marl-argillite.

The dominant structure at the Ada Tepe deposit is a 'detachment' fault that separates the metamorphic basement rocks from the overlying mineralized sedimentary rocks, and forms a 10° to 15° north dipping lower structural bounding surface to the deposit.

The epithermal mineralization at Ada Tepe is subdivided into two types, based on the geometry and style of the mineralized zone. The ‘Wall Zone’ mineralization is a massive shallow dipping (15 degrees north), siliceous body up to 5 metres in thickness that sits immediately above the ‘detachment’ structure. The ‘Upper Zone’ mineralization is a series of predominantly east-west trending steeply dipping veins that extend upwards into the sedimentary rocks above the ‘Wall Zone’.

Gold is present as electrum and the highest gold grades are associated with typical epithermal colloform-banded and lattice-bladed silica-carbonate-adularia veins and hydrothermal breccias.

At the Surnak prospect, located about 3 km west of Ada Tepe, gold-silver mineralization occurs along a north-striking sub-vertical metamorphic and sedimentary rock contact and is associated with sulphide-rich silica and carbonate altered hydrothermal breccias. The mineralization extends both into the underlying metamorphic basement rocks and the overlying sediments. Mineralization in the sediments is controlled by a combination of sub-horizontal stratigraphy-related permeable rocks and steeper feeder structures.

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