Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon...

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Sotkamo Silver Tampere area Erkki Kuronen Chief Geologist, M.Sc., MAusIMM Sotkamo Silver Oy

Transcript of Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon...

Page 1: Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon Mining operates two gold mines, Orivesi and Jokisivu and has a concentrating plant in

Sotkamo SilverTampere area

Erkki KuronenChief Geologist, M.Sc., MAusIMMSotkamo Silver Oy

Page 2: Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon Mining operates two gold mines, Orivesi and Jokisivu and has a concentrating plant in

Tampere area Au deposits – highlights

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Dragon Mining operates two gold mines, Orivesi and Jokisivu and has a concentrating plant in Vammala producing 30 koz/a.Sotkamo holds the following deposits:• Hopeavuori – the most advanced

• Inferred resource 238 kt @ 3.8 g/t • Drilling commencing in Nov’ 2017

• Kalliojärvi 1, best diamond core interval:• 4.8 meters @ 6.5 g/t

• Metsäkylä 1, best diamond core interval:• 1 meters @ 27.6 g/t, native

• Järvenpää 1, best diamond core interval:• Up to 2 g/t Au in drill core samples

• Lavajärvi 1, best diamond core interval:• 4 meters @ 1 g/t

• Isovesi 1, best diamond core interval:• 3.7 meters @ 5.3 g/t Au

40 km

Au deposits in Tampere area yellow dots refer to known deposits

Page 3: Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon Mining operates two gold mines, Orivesi and Jokisivu and has a concentrating plant in

Tampere area – deposit geology

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Paleoproterozoic Tampere schist and Vammala migmatite belts; the latter being more intensively deformed and metamorphosed. Hosts tens of indivial deposits, both Orogenic and Epithermal in origin.• Gold occurs typically with arsenopyrite in

quartz veins, as native or associated with bismuth and antimone

• GTK and mining companies have conducted exploration works; all previous data available for Sotkamo. Ca. 9 000 meters of historic drill holes in the tenement areas.

Au-bearing quartz veins in Metsäkylä

Page 4: Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon Mining operates two gold mines, Orivesi and Jokisivu and has a concentrating plant in

Hopeavuori

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• GTK investigations in the 1990’s:• diamond drilling (29 holes, 1 905,40 meters) • geophysical surveys (Mag, EM, Gravity)• geochemical soil sampling

• Sotkamo conducted re-assaying of historic drill core in 2014, over 900 samples

• Lab-scale concentrating tests of drill core sample at GTK/Mintek

• Bulk sulphide flotation yielded 93% Au recovery• Gold is associated with thin quartz veins and shear

zones both in the granodiorite and amphibolite. Arsenopyrite and pyrrhotite are dominant sulphide minerals.

• Drilling is concentrated to Hopeavuori and Hopeavuori W; distance ca. 500 meters

• Deposit is open along the strike and down-dip and can increase significantly in tonnage

Hopeavuori – drill hole locations and geology

AmphiboliteGranodiorite

Felsic dyke

Hopeavuori W

100 m

Hopeavuori

Page 5: Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon Mining operates two gold mines, Orivesi and Jokisivu and has a concentrating plant in

1.2.2018 Silver 5

Kalliojärvi – another interesting target in Tampere• GTK investigated the area in the

1990’s and early 2000’s:

• diamond drilling (46 holes totalling

2 463.25 meters)

• geophysical surveys (Mag, IP)

• geochemical soil sampling

• Gold is associated with quartz veins in

a set of subparallel, E-W trending

mineralized zones along strike of minor

shear zones in a shallow west-plunging

synform of the host mica gneiss.

• Au-anomaly in soil was the first

indication but drilling has concentrated

to W-end of the anomaly. Soil anomaly

has length of ca. 400 m in surface and

the deposit is open along the strike

• The best intersections include 4.8 m at

6.5 ppm, 4.3 m at 7.2 ppm, 3 m at 5.6

ppm and 1 m at 15.7 ppm Au

Page 6: Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon Mining operates two gold mines, Orivesi and Jokisivu and has a concentrating plant in

Available data

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Tampere in Finland

• Representive drill core intersections are stored in the National Core Depot in Loppi• Historic exploration data is available in hard copies and also in electronic form at GTK, including:

• Ground geophysical survey results• Geochemical sampling results• Drill holes logs and analysis

• Reports in electronic format (dominantly in Finnish)• Most of the data is available in electronic format or can be easily obtained in electronic format• Drill core depots can be visited and drill core inspected as per rules of the GTK/NGU• Field visits can be conducted earliest in May (Tampere) and late-June/early-July (Mo i Rana)

Page 7: Sotkamo Silver Tampere area · Tampere area Au deposits –highlights Sotkamo Silver 2 Dragon Mining operates two gold mines, Orivesi and Jokisivu and has a concentrating plant in

Conclusions

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• Sotkamo holds very attractive tenements in Tampere; highly prospective and underexplored in recent times.

• Tampere in Finland• Potential gold occurrences in area with operating gold mines.• Proven geological potential.• Good infrastructure.