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Bergslagen

The prolific Bergslagen belt in south central Sweden has been subject to mining for more than 1000 years. Bergslagen is the intensely mineralized part of a large Early Proterozoic (1.90-1.87 Ga) felsic magmatic region.


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A wide variety of deposits occur within the Bergslagen Belt, including apatite-bearing iron ore (Grängesberg mine, 198 Mt) Banded Iron formations (Norberg, 25.5 Mt) and magnetite-calc-silicate-skarn ores. The Bergslagen is also host to the historical, strata-bound Zn-Cu-Pb-(Au-Ag), mine of Falun (28 Mt), which in the 17th century supplied 2/3 of the worlds copper. Among the other base metal mines in the region Boliden's Garpenberg mine (22 Mt) and Zinkgruvan (+43 Mt), operated by Lundin Mining, are still in production.

Northern Lion Gold holds 7 different mineral exploration permits on some of the most prospective ground in the belt.

The Skyttgruvan project (1246.79 ha) encompasses the Skyttgruvan past producer (0.28 Mt @ 8% Zn, 4% Cu) and is located some 4 km east of the famous past producer, known as the Falun copper mine. The Falun orebody was mined up until 1992 and is believed to have contained approximately 28 Mt of ore @ 2-4% Cu, 3-6% Zn and 2-4 g/t Au. Both past producers are on the same geological horizon and are underlain by hydrothermal altered felsic volcanics. The Skyttgruvan deposit was mined up until 1908 to approximately 200 meters depth. The area has undergone very limited modern exploration techniques.

The Oxberg (2342.16 ha) exploration permit is approximately 13 km NW of the historic Falun mine and is underlain by similar hydrothermaly altered felsic volcanics as found in the Falun-Skyttgruvan area. Within the license area numerous small Zn-Pb-Cu occurrences are found. Grab samples from old diggings has yielded peak values of 6.47 % Cu, 9.44 % Zn, 8.41 % Pb and 185 g/ton Ag. Locally anomalous gold values (0.72 g/ton) have been recognized. Previous operators identified a >3 km long conductor which only were tested with a limited number of drill holes.

Kuså (87.36 ha) permit encompasses a a small gabbro intrusion that contains a modest nickel deposit exploited during the second World War and in to the fifties yielding 3,500.00 tons @ 0.9% Ni and 1.0% Cu.

Skällingsberg (1408.04 ha) and Hålstjärn (591.43 ha) permits are located some 8 km and 15 km respectively north of and in a similar geological setting as the currently operating Garpenberg mine. In Skällingsberg 3 historic small mines/diggings occur evenly spread out through the belt. Garb samples from old mine dumps yielded peak values of 6.55% Zn, 23.3% Pb, 0.99% Cu and 228 g/ton Ag.

The Flinten (3435.48 ha) project covers a portion of a layered intrusion and is located some 18 km ENE of Falun. Limited work on parts of the intrusion by the Geological Survey of Sweden yielded anomalous values in PGE:s and gold. Peak values 1.80 g/t Au, 0.20 ppm Pd, 0.13 ppm Pt (0.2 %Ni and 0.4 % Cu)

The Karlsgruvan (529.07 ha) exploration permit is located on the East coast of Sweden some 90 km N of Stockholm. The main occurrence in the area is the Karlsgruvan past producer iron mine (Calc-Silicate-Skarn). Government sampling of the old mine dumps yielded very high Zinc contents (17% Zn). Subsequent till sampling by Northern Lion Gold identified a strong geochemical anomaly, approximately 2 km long over and on strike from the old mine.

 


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