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Location: 8 km SW from Huittinen, Finland
Kummunkuja 38SastamalaFinland382 00
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The Jokisivu Mine has two areas of mineralisation (Kujankallio and Arpola) which are approximately 200m apart. The Jokisivu Mine is a Palaeoproterozoic orogenic gold deposit located in the Vammala Migmatite Belt. The deposit is controlled by a conjugate set of brittle-ductile shear zones between two major NW-trending shear zones in upper-amphibolite facies rocks.Mineralisation is hosted within relatively undeformed and unaltered diorite, in 1 to 5 metre wide shear zones that are characterised by laminated, pinching and swelling quartz veins and a well-developed moderately (50°) east-northeast plunging lineation. The Kujankallio vein sets have been shown by drilling to extend to at least 525 m depth whereas Arpola has only been drilled to 200m. Gold occurs chiefly as free grains in quartz veins, locally related to arsenopyrite, loellingite, pyrrhotite and scheelite. The Jokisivu diorite is surrounded by mica gneisses, volcanogenic and arenitic metasedimentary gneisses and granitoids (and leukosomes of gneisses) of which have tonalitic to granodioritic composition.DimensionsThe Kujankallio Mineral Resource area extends over a west-east strike length of 990m (from 5,680mE – 6,670mE local grid), has a maximum width of 460m (9,320mN – 9,780mN local grid) and includes the 710m vertical interval from the 0m level to the -710m level, local grid.The Arpola Mineral Resource area extends over a west-east strike length of 460m (from 6,050mE – 6,510mE local grid), has a maximum width of 360m (9,110mN – 9,470mN local grid) and includes the 400m vertical interval from the -10m level to the -410m level, local grid.
