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Location: 40 Km NE from Ilomantsi, Finland
Pampalontie 11IlomantsiFinland82967
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Pampalo is an orogenic gold deposit located within the Archean Ilomantsi greenstone belt. The deposit is characterized by a series of sub-vertical, flattened, parallel pipes, plunging to the northeast and parallel to the local foliation and fold axis, implying a strong structural control of the mineralization. The mineralization is hosted by an intermediate pyroclastic unit, metamorphosed to greenschist – lower-amphibolite facies.Main type: Orogenic (metamorphic hydrothermal)Precipitation of gold by desulphidation of fluid and, possibly, by decomposition of Aubisulphide, -thiosulphide and -telluride complexes of fluid due to cooling and/or changes in pH and fO2. Probably, gold precipitated just below 500°C with sulphides due to reaction between the mineralising fluid and wall-rock (chiefly by sulphidation).DimensionThe deposit comprises three main NE-plunging ore lenses or shoots. Two of these have a significant continuation to the north, and there are indications of further ore bodies, 200 m to the E of the open pit, at Juttuhuuhta. The main ore bodies are open at the depth of 800 m. A fourth ore body, S-2, occures at depth - it does not extend to the surface but is open at the depth of >600 m. The Juttuhuuhta ore bodies are intersected up to 269 m down-hole depth. Ore-grade intercepts at >800 m depth.
