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Modified: 13.08.2009

Hetteilä - Gold Database

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Name Hetteilä DATA UPDATED 24.5.2007
Alternative names Hetteilä 1, Hetteilä N
Deposit summary HETTEILÄ, in the central part of the Kuhmo greenstone belt, is an Archaean orogenic gold occurrence with no resource estimate available. It is hosted by BIF and amphibolite near a NNW-trending shear zone.
LOCATION
Geological domain Archaean Belt Kuhmo
Site photo   Regional map southkuhmo_regionalgeologymap_th
Map sheet 4412 10
Northing (kkj) 7139400 Easting (kkj) 4459000
Latitude   Longitude  
Municipality Kuhmo
Nearest town, roads 35 km NW from Kuhmo. A sealed road to the area.
MINING
Exploration licence no 7466/1 Mining concession no  
Present holder Magnus Minerals Oy (2007–)
Previous holders Geological Survey of Finland (GTK) 2002–2005
Infrastructure fig 1   Infrastructure fig 2  
Claim fig 1   Claim fig 2  
Mine photo 1   Mine photo 2  
Mine photo 3   Mine photo 4  
Status of development Prospect
When mined  
Resources  
Deposit size (Mt)   Reference (size)  
Total in-situ gold (kg)   Reference (in-situ Au)  
Total gold production (kg)   Reference (gold prod)  
Production of other metals  
Extent of mineralisation Open along strike and at depth [1].
Lodes  
Best sections 1 m @ 1.6 ppm Au [1].
EXPLORATION
Discovery year 2002
Discovery A Ni-rich glacial erratic found by an amateur prospector draw GTK to the area in 2001. Gold-mineralised zones were discovered in drilling into Ni-potential zones [1].
Exploration history GTK 2002– [1]: High- and low-altitude airborne magnetic, electromagnetic and radiometric survey, ground slingram and magnetic survey, regional and local till stratigraphy and geochemistry, bedrock mapping, diamond drilling.
Section figure 1 hetteila_drillhole_r399_th Plan figure 1  
Section figure 2 Plan figure 2  
Section figure 3   Plan figure 3  
Trench fig 1   Trench fig 4  
Trench fig 2   Trench fig 5  
Trench fig 3   Trench fig 6  
Explor site photo 1   Explor site photo 2  
Geophysical response  
Drilling GTK (2002–2003): 10 diamond-drill holes, total 1274 m [1].
Elements analysed Na2O, MgO, Al2O3, SiO2, P2O5, K2O, CaO, TiO2, MnO, Fe2O3, S, Cl, V, Cr, Ni, Cu, Zn, Ga, As, Rb, Sr, Zr, Nb, Mo, Sn, Sb, Ba, Pb, Bi by XRF (total leach), Ag, As, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, S, Sb, Zn by ICP-AES (aqua regia leach), Au and Te by GFAAS (aqua regia leach) [1].
Primary dispersion Up to 20 m wide Au and 50 m wide Te anomalies enclose the highest Au values detected in drill core [1].
Secondary dispersion
Primary anomaly fig 1 hetteila_aero_electromag_map_th Secondary anomaly fig 1 kuhmo_aeromag_gold_in_till_th
Primary anomaly fig 2 hetteila_aero_magetic_map_th Secondary anomaly fig 2 kgb_au_as_map_th
Primary anomaly fig 3 palovaara_louhiniemi_aeromagn_th Secondary anomaly fig 3 central_kuhmobelt_geology_deposits_au_in_till_th
Primary anomaly fig 4 palovaara_louhiniemi_aero_electromagn_th Secondary anomaly fig 4  
Primary anomaly fig 5   Secondary anomaly fig 5  
Economic evaluations  
Exploration geologist in charge GTK: Tapio Halkoaho
ORE
Siting of gold  
Fineness  
Major opaques  
Minor opaques  
Gangue  
Ore miner. photo 1   Ore miner. photo 5  
Ore miner. photo 2   Ore miner. photo 6  
Ore miner. photo 3   Ore outcrop photo 1  
Ore miner. photo 4   Ore outcrop photo 2  
Ore composition  
Enriched elements As, Au, Te, S [1].
Ore fluid  
Stable isotopes  
Pb isotope data  
GEOLOGY
Geological setting The occurrence is in a 5-9 m thick sulphidic BIF unit and banded amphibolite in a sequence of metasedimentary and tholeiitic to komatiitic metavolcanic rocks of the Vuosanka area, in the central eastern part of the Neoarchaean Kuhmo greenstone belt [1]. There also are up to 0.3 ppm Au (1.5 m intercept) in other rock units in the area, eg. in a tonalitic gneiss 3 km south of Hetteilä [1].
Major host rocks BIF [1].
Minor host rocks Amphibolite, komatiite [1].
Intrusives Narrow granitic and tonalitic dykes witin the hosting sequence, and TTG-series intrusions immediately to the east of the supracrustal sequence [1].
Regional geol map 1 hetteila_in_kuhmobelt_th Outcrop photo 1  
Regional geol map 2 kbg_geology_au_occurrences_th Outcrop photo 2  
Regional geol map 3 palovaara_louhiniemi_geology_as_till_th Outcrop photo 3  
Local geology map 1 hetteila_region_geologymap_th Outcrop photo 3  
Local geology map 2  
METAMORPHISM
Metamorphic history  
Metamorphic grade  
Metamorphic mineral assemblages BIF: amphibole-garnet-quartz-magnetite-sulphides [1].
Komatiite: tremolite-biotite-chlorite [1].
Metamorph photo 1   Metamorph photo 2  
STRUCTURE
Structural style  
Closest major shear  
Controlling structure Possibly a NNW-trending shar zone [2]; late-D3 or D4 structures [3].
Deformation history At least, six deformation stages during the late Archaean and two deformation stages during the Palaeoproterozoic detected in the area; gold mineralisation is related to the Archaean late D3 and/or D4 stages; D2: 2850–2837 Ma, D3: 2701–2697 Ma, D4: peaked at 2657±32 Ma; age of D2 is probably 2820±15 Ma [2] or 2843±18 Ma [4].
Ore fabric  
Veins  
Structure photo 1   Vein photo 1  
Structure photo 2   Vein photo 2  
Structure photo 3   Vein photo 3  
ALTERATION
General alteration  
Proximal alteration  
Intermediate alteration  
Distal alteration  
Zonation figure   Prox alteration photo 1  
Alteration photo 1   Prox alteration photo 2  
Alteration photo 2   Intermed alteration photo  
Alteration photo 3   Distal alteration photo 1  
Post-mineralisation modifications  
TIMING  
GENETIC MODEL Structurally controlled orogenic gold mineralisation suggested by the hints given in the reference [1].
Genetic type Orogenic References [1]
Alternative genetic type 1   References  
Alternative genetic type 2   References  

References

1. Halkoaho, T., Niskanen, M. & Pietikäinen, K. 2006. A reserch report of nickel studies concerning the claims Härmälahti 1 and 2 (register numbers of claims: 7437/1 and 7628/2), Hetteilä 1 and 2 (7466/1 and 7466/2), and Paljakka 1 and 2 (7466/3 and 7563/1) in Kuhmo during years 2002–2 003. Geol. Surv. Finland, Report M06/4412/2006/2/10. 17 p. (English summary, 1.6 MB)
2. Luukkonen, E., Halkoaho, T., Hartikainen, A., Heino, T., Niskanen, M., Pietikäinen, K. & Tenhola, M. 2002. Itä-Suomen arkeeiset alueet -hankkeen (12201 ja 210 5000) toiminta vuosina 1992-2001 Suomussalmen, Hyrynsalmen, Kuhmon, Nurmeksen, Rautavaaran, Valtimon, Lieksan, Ilomantsin, Kiihtelysvaaran, Enon, Kontiolahden, Tohmajärven ja Tuupovaaran alueella. Geol. Surv. Finland, Report M19/4513/2002/1. 265 p. (in Finnish, 130 MB)
3. Luukkonen, E., Pajunen, M. & Poutiainen, M. 1992. Kuhmo-Suomussalmen alueen arkeeisen kallioperän rakenne-evoluutio ja Au-aiheet. In: E. Ekdahl (ed.) Suomen kallioperän kehitys ja raaka-ainevarat. Vuorimiesyhdistys, Sarja. B, 51, 11-12.
4. Sorjonen-Ward, P. & Luukkonen, E.J. 2005. Archean rocks. In: Precambrian Geology of Finland – Key to the Evolution of The Fennoscandian Shield. Elsevier Science B.V., Amsterdam, 19-99.
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