Finland

In 2007, Greg attended an international Spatial Data Modelling seminar in Rovaniemi, Finland. He presented several talks on the applications of modelling in the mineral exploration and environmental fields. Subsequent discussions with staff from the Finnish Geological Survey indicated Finland had significant potential for new discoveries as, in their view, many commodities remained highly unexplored. Additionally, Finland has excellent geological databases, good infrastructure and readily available exploration services.

As a result of this sequence of events, Kenex compiled a GIS of available relevant historical exploration data over the Central Lapland Greenstone Belt late in 2008. We used this GIS to undertake predictive modelling that identified targets for orogenic gold exploration.

 

Orogenic gold is the most common style of gold mineralisation in Finland with ~140 known occurrences. It has been described in all tectonic districts, in both Archean and Proterozoic domains, but is particularly well known in greenstone belts in Central Lapland.

 

This region is dominated by Archean and Palaeoproterozoic metamorphosed mafic to ultramafic volcanics with lesser volumes of coeval meta-sedimentary rocks and slightly younger felsic to intermediate intrusives. It is structurally complex with numerous crustal scale reverse, normal and detachment faults, often intersecting each other.

 

Map showing distribution of faulting in the area.  Training data represented by white circles

Map showing metamorphic lithologies in the project area. Training data represented by white circles.

 

Although the Central Lapland Greenstone Belt is one the richest gold producing regions in Finland and contains numerous orogenic gold, iron oxide copper gold and palaeoplacer gold deposits, there are also a number of deposits with an atypical metal association including significant copper, cobalt, nickel and/or uranium. These elements are typically present in minor to sub-economic concentrations, although copper has been extracted from Saattopora and Sirkka.

 

It has been suggested this unusual metal association is the result of orogenic evolution in an area where pre-existing intracratonic basins containing extensive evaporite sequences have produced anomalously saline ore fluids, and in turn, transport of base metals. Kenex's final Finland prospectivity model will be used to assess mineral exploration tenders, provided by the Finish Ministry of Trade and Industry, and has provided a valuable mineral exploration tool for clients looking for prospective areas not yet covered by mineral exploration tenements. 

 

For more about projects in Finland contact Greg here at Kenex.

 

 

Prospectivity model by staff from Finland Geological Survey for IOCG mineralisation

 

 

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