INTRODUCTION Prospectivity mapping Study area and methods
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1 Quaternary geological and till geochemical studies in verifying GIS-based prospectivity mapping in the Central Lapland Greenstone Belt, northern Finland Sarala Pertti, Nykänen Vesa, Sarapää Olli, Peltoniemi Anne and Ojala V. Juhani Geological Survey of Finland P.O. Box 77, FIN Rovaniemi, FINLAND. Keywords: Glacial geology, till geochemistry, gold, exploration, prospectivity mapping, Finland ABSTRACT The Geological Survey of Finland has done a lot of work to explore gold in the Central Lapland Greenstone Belt in northern Finland. The whole area is proven to have potential for Au mineralization, and of that the two presently active gold mines are the proof. New methods have been used to define the most prospective areas for gold exploration in this district. GIS-based prospectivity analysis is one of them. Four target areas (Vuomanperänmaa, Nuttiot, Petäjäselkä and Lauttaselkä) anomalous in analysis have been selected for detailed studies. An aim has been to use surficial geological methods to examine the result of analysis and also focus future exploration. Test pit studies with till geochemical and heavy mineral sampling proved to be effective and fast methods to get information of the till deposits and for estimating transport distance of mineralized material under former glacial processes. The results of this study strengthen the decision to continue gold exploration in all of the targets. 1
2 INTRODUCTION During the last decade gold exploration has been very intensive in Finland. Particularly the Central Lapland Greenstone Belt (CLGB) has been in the centre of investigations of foreign exploration companies and the Geological Survey of Finland (GTK). The whole area is proven to have potential for Au mineralization and many Au deposits have been already found including three Au mines, Saattopora ( ), Pahtavaara (in operation) and Suurikuusikko (under construction). Of those deposits, Pahtavaara and Suurikuusikko were found by the GTK by using till geochemical methods. Large amounts of data have been collected from the CLGB during several geological, geophysical and geochemical mapping projects and numerous exploration programs, and with the use of GIS software, the data can be effectively handled and used in prospectivity. Also, traditional exploration methods, e.g., till stratigraphy, till geochemistry and heavy mineral studies (Hirvas et al. 1977; Hirvas 1989, 1991; Hirvas & Nenonen 1990) can provided a new point of view due to increased knowledge of glacial dynamics and deposition processes in the central areas of large Scandinavian continental glacier (Sarala, 2005). Prospectivity mapping GIS based prospectivity analysis is one of the most promising methods for defining the best target areas inside a large exploration area. The main aim of this analysis is to integrate data from various sources to generate a single response theme, a mineral potential or a prospectivity map by using GIS software with Spatial Analyst and Modelling extensions. In GTK, ArcGIS 9.1 with Spatial Analyst and ArcSDM extensions are used (Nykänen, 2006). High-resolution low-altitude airborne multielement geophysical survey data, gravity, radiometric, magnetic and electromagnetic ground survey datasets and a nationwide till geochemical dataset in resolution with 1 sample per 4 km 2 are used in the analysis. Also some detailed datasets are available. Bedrock mapping and Quaternary geology mapping programs have generated vast databases of field observations and geological maps that, as fully attributed digital versions are also suitable for spatial data analysis. One method to model prospectivity is to use the known examples of the Au occurrences as training sites. Study area and methods Based on the prospectivity mapping many target areas potential for Au exploration have been found in the CLGB. The bedrock is composed of Archaean granites and gneisses and an association of the Palaeoproterotzoic sedimentary and volcanic rocks. Four target areas (Vuomanperänmaa, Nuttiot, Petäjäselkä and Lauttaselkä) have been selected for detailed studies. These targets situate near the presently active gold mines, Pahtavaara and Suurikuusikko, in the boundary between the municipalities of Kittilä and Sodankylä (Fig. 1). The aim has been to verify and analyse the results of the prospectivity mapping with a detailed fieldwork and sampling. In the field, the structure and composition of the glacial overburden have been analyzed using test pits and trenches. Till samples were collected for geochemical ( g/sample) and heavy mineral studies (10 l/sample; 2
3 concentrated by mechanical spiral separator), and counting the proportion of different rock types in the pebble size fraction (50 pieces/sample). In addition, weathered bedrock and fresh bedrock were sampled where possible. Systematic percussion till sampling with a 200x200 m grid was also done as well as complementary bedrock and erratic boulder mappings. Chemical analyses of till size fraction <0.06 mm have been done in GTK s laboratory using GAAS and ICP-AES instruments after partial dissolving. Furthermore, earlier exploration data (till geochemistry, geophysics, bedrock and boulder observations) have been integrated into the new datasets. Fig. 1. A location of the four target areas in Central Lapland Greenstone Belt in northern Finland. RESULTS Preliminary results of the till geochemistry and heavy mineral analyses indicate that the modelling of prospectivity is an effective method in Au exploration. Glacial overburden consists mainly of 1-2 sandy till units with thickness of 2-5 m. An amount of pebbles composed of local bedrock rock types is usually great and their angular shape indicates quite short glacial transportation. A proportion of long-distance rocks (> 15 km), like granite and gneiss, is low and keeps relative stabile in the counting samples from all around the sampling area. Weathered bedrock surface is also common and its thickness ranges 0-3 m. The mixture of material from the weathering crust into till is problematic in places due to overemphasize of local bedrock composition in till geochemistry. 3
4 Till geochemistry and heavy mineral studies show that all of the target areas have anomalous Au concentrations in till. In the Vuomanperänmaa and Nuttiot areas the highest Au contents (10-35 ppb) indicate mineralizations in the contact zones of different lithological units. The bedrock of the targets is composed of mafic volcanic and sedimentary rocks (mica schists and black schists; Fig. 2), metamorphosed at upper greenschist facies conditions. Deformed zones with carbonatization and occasional quartz mark hydrothermal alteration in the bedrock. Furthermore, banded Fig. 2. Till geochemical (AAS) and heavy mineral sampling site on the geological map of the Nuttiot area. Bold numbers indicate the total number of Au nuggets in heavy mineral samples (ca. 10 l) of the test pits (1-2 samples/test pit) marked as M20-M42. 4
5 iron formation (BIF) black schists and serpentinite units in the Nuttiot ophiolite area are clearly seen in pebble and boulder composition of till. In the Nuttiot target 2-4 gold nuggets per heavy mineral sample were found on the distal side of the Aumineralized shear zone at the contact zone between serpentinites and volcanic rocks (Fig. 2). Bedrock in the Petäjäselkä target area is composed of hydrothermally altered mafic volcanic rock and iron formations. The gold anomalous zone follows a heterogeneous and deformed NNW trending zone of graphic tuffs, cherts and intermediate volcanic rocks within a mafic volcanic rock dominated domain. In addition to deformation zones subparallel the main trend the area is cut by NE-SW shear zones. Gold contents at till are strongly anomalous (ranging 10 ppb to 900 ppb) at the several sampling sites. The highest contents (from 200 ppb to 900 ppb) were in till in the 100 m long, west-east oriented test trench (2006 AMPE ), in which the shear zone hosted Au mineralization was exposed (Fig. 3). Glacial transport distance (or dilution distance of till material) is short: the distal tail for the anomalous Au contents was only about 50 m from the bedrock source. In heavy mineral samples, even 21 Au nuggets have been found in till above the mineralized shear zone. Fig. 3. Gold contents (ppb) in <0.06 mm size fraction in till on the test trench M9 in Petäjäselkä. Samples were analyzed by GAAS. Photo P. Sarala. Lauttaselkä is the latest target under testing in our prospectivity studies. Field work for surficial geology has been done during the late autumn 2006 and till geochemical sampling will be finished before summer The bedrock in the target is 5
6 composed of mafic volcanic rock, black schist and serpentinite, which have been strongly altered (carbonatized with quartz and graphite veins) in places. Till geochemical analyses are not ready at the moment writing this paper but high gold nugget counts (2-5 nuggets/sample) were done near the alteration zones in a downice direction (eastern side of the probable mineralization). The highest gold nuggets amount (18 st) was in the weathered bedrock sample in the eastern part of the study area. Based on the heavy mineral study the target is proven to have potential for gold mineralization in the bedrock. CONCLUSIONS Till geochemical and heavy mineral analyses in the CLGB, northern Finland indicate that GIS-based prospectivity analysis is a usable way to find out new gold target areas. Detailed surficial geological studies including geomorhological and stratigraphical investigations, geochemical and heavy mineral samplings have proven to be effective in focusing future exploration studies. In the near future drilling programs are going to carry out in those target areas to get more information and samples from the most promising structures and zones in bedrock. REFERENCES Hirvas, H., Application of glacial geological studies in prospecting in Finland. In: DiLabio, R.N.W., Coker, W.B. (Eds.), Drift Prospecting. Geol. Surv. Canada, Pap , 1-6. Hirvas, H., Pleistocene stratigraphy of Finnish Lapland. Geological Survey of Finland, Bulletin 354, 123 p. Hirvas, H., Alftan, A., Pulkkinen, R., Purnanen, R. & Tynni, R., Raportti malminetsintää palvelevasta maaperätutkimuksesta Pohjois-Suomessa vuosina Summary: A report on glacial drift investigations for ore prospecting purposes in northern Finland Geological Survey of Finland, Report of Investigation 19, 54 p. Hirvas, H. & Nenonen, K., Field methods for glacial indicator tracing. In: Kujansuu, R., Saarnisto, M. (Eds.), Glacial indicator tracing. Balkema, Rotterdam, pp Nykänen, V Spatial analysis as prospectivity mapping tool. Geological Survey of Finland 1/12/ vesa.nykanen@gtk.fi Sarala, P Glacial morphology and dynamics with till geochemical exploration in the ribbed moraine area of Peräpohjola, Finnish Lapland. PhD thesis, Geological Survey of Finland, Espoo, 17 p + 6 original articles. 6
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