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Tapuli
Sahavaara
Pellivuoma
Hannukainen
Sahavaara
Geology and Mineralization
Sahavaara occupies the same NE-SW trending shear which hosts the Tapuli deposit only 4 km to the south. The magnetite deposit occurs as a continuous "seam" located between a hanging-wall quartzite and footwall graphitic schist. The ore body is enveloped by three types of skarns. Minor remnants of skarn-altered dolomite occur within the deposit and likely reflect the original protolith. Contacts between the host rocks, skarn and mineralization are predominantly tectonic. There are two preferred fault orientations, the first parallel to the NNE-SSW striking metamorphic foliation and a second which strikes NW-SE with steep to moderate dips.
The bulk of the magnetite mineralization consists of one main lens and a smaller adjacent mineralized lens. The main lens has a NNE-SSW strike, dips 50°-70° west, plunges to the north and is concordant with the host sedimentary rocks. The lens has been delineated at surface over a strike of 1,300 meters with an average true width of 52 meters. At a down-dip distance of 550 meters, the deposit has been traced for 600 meters along strike with an average width of 43 meters. The footwall rock, immediately below the skarn unit, is a graphitic schist, rich in pyrrhotite and lesser amounts of pyrite with some local chalcopyrite mineralization with elevated concentrations of copper. The mineralization is generally open down-dip below the limits of the known resource; however, the vertical extent of the deposit is constrained to the south due to the northerly plunge of the ore body.
The adjacent lens, Södra (South) Sahavaara, is located to the south and en echelon to the main zone of mineralization. Södra Sahavaara averages about 20 meters in thickness and is discontinuous along strike for 1,000 meters. Lithology, mineralization and attitude of the mineralized horizon are similar to the main Sahavaara zone.
The main minerals in the ore zone are magnetite, serpentine, pyrrhotite, pyrite, and tremolite. Magnetite is currently the main mineral of economic interest in the Sahavaara deposit occurring as massive to semi massive mineralization gradational to banded mineralization near the footwall. Chalcopyrite occurs throughout the mineralized body as sporadic disseminations and as narrow veins. The amount of chalcopyrite is generally low yielding an average of 0.08% Cu within the mineralised ore body.
Sahavaara occupies the same NE-SW trending shear which hosts the Tapuli deposit only 4 km to the south. The magnetite deposit occurs as a continuous "seam" located between a hanging-wall quartzite and footwall graphitic schist. The ore body is enveloped by three types of skarns. Minor remnants of skarn-altered dolomite occur within the deposit and likely reflect the original protolith. Contacts between the host rocks, skarn and mineralization are predominantly tectonic. There are two preferred fault orientations, the first parallel to the NNE-SSW striking metamorphic foliation and a second which strikes NW-SE with steep to moderate dips.
The bulk of the magnetite mineralization consists of one main lens and a smaller adjacent mineralized lens. The main lens has a NNE-SSW strike, dips 50°-70° west, plunges to the north and is concordant with the host sedimentary rocks. The lens has been delineated at surface over a strike of 1,300 meters with an average true width of 52 meters. At a down-dip distance of 550 meters, the deposit has been traced for 600 meters along strike with an average width of 43 meters. The footwall rock, immediately below the skarn unit, is a graphitic schist, rich in pyrrhotite and lesser amounts of pyrite with some local chalcopyrite mineralization with elevated concentrations of copper. The mineralization is generally open down-dip below the limits of the known resource; however, the vertical extent of the deposit is constrained to the south due to the northerly plunge of the ore body.
The adjacent lens, Södra (South) Sahavaara, is located to the south and en echelon to the main zone of mineralization. Södra Sahavaara averages about 20 meters in thickness and is discontinuous along strike for 1,000 meters. Lithology, mineralization and attitude of the mineralized horizon are similar to the main Sahavaara zone.
The main minerals in the ore zone are magnetite, serpentine, pyrrhotite, pyrite, and tremolite. Magnetite is currently the main mineral of economic interest in the Sahavaara deposit occurring as massive to semi massive mineralization gradational to banded mineralization near the footwall. Chalcopyrite occurs throughout the mineralized body as sporadic disseminations and as narrow veins. The amount of chalcopyrite is generally low yielding an average of 0.08% Cu within the mineralised ore body.
 Figure 1 Click to Enlarge |
 Figure 2 Click to Enlarge |
