Gold deposits in northern Finland - Arkisto.gsf.fi

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Table 1. Gold and gold-base metal deposits in the Central Lapland greenstone belt and Peräpohja schist belt with a resource estimate. The data are from the FINGOLD database (Eilu & Pankka 2009) and FODD (2013). Mining by the end of 2012, mined tonnages and grades as reported by the mining companies. Size indicates global resource + mined in millions of tonnes of ore. Deposit Size (Mt) Mined (Mt) Au (g/t) Co (%) Cu (%) Ni (%) Host rocks 1 Siting of gold Central Lapland greenstone belt Orogenic gold deposit Hirvilavanmaa 0.11 2.9 Komatiite Free native with pyrite and tellurides Kaaresselkä 0.3 5 0.03 0.2 Mafic tuffite Free native assoc. with gangue and sulphides Kettukuusikko 0.44 1.8 nr Komatiite Free native assoc.with pyrite and vein quartz Kuotko 1.823 2.89 Mafic volcanic rocks Kutuvuoma 0.068 0.02 6.7 Komatiite, phyllite Free native assoc. with arsenopyrite and pyrite Free native assoc. with arsenopyrite and pyrite Loukinen 2 0.114 0.5 nr 0.45 Komatiite Free native + inclusions in sulphides Saattopora Au 3 2.163 2.163 2.9 0.25 Albitised phyllite Sirkka (Sirkka kaivos) 0.25 0.8 0.1 0.38 0.32 Albitised phyllite Free native assoc. with gangue and sulphides Free native assoc. with gangue and sulpharsenides Soretialehto 0.013 3.5 Komatiite Free native assoc. with quartz and pyrite Kittilä Mine (Suurikuusikko) 64.09 4.14 4.15 Mafic volcanic rocks, phyllite Refractory in arsenopyrite and pyrite Syngenetic Cu overprinted by orogenic gold or orogenic gold with an anomalous metal association Riikonkoski 9.45 nr 0.45 Intermediate tuffite Saattopora Cu 11.6 0.25 0.01 0.62 0.1 Intermediate tuffite Assoc. with arsenopyrite ± chalcopyrite Associated with chalcopyrite? Orogenic or syngenetic Pahtavaara Au 7.74 4.98 2.65 Komatiite Free native assoc. with gangue Peräpohja schist belt Kivimaa 0.023 0.018 5.3 1.87 Dolerite Assoc. with arsenopyrite ± free gold. Vähäjoki 4 10.5 0.2 0.03 0.17 Mafic tuffite, marl Assoc. with pyrite, cobaltite and arsenopyrite nr Not reported in resource estimate, but analysed drill intercepts indicate that the deposit contains, at least in parts, several g/t gold (if Cu reported) or 0.1−2% copper (if Au reported). 1 All host rocks are metamorphosed; hence, the prefix meta is implied but omitted. ‘Intermed tuffite’ and ‘phyllite’ define a sequence varying from volcanic to clastic-dominated types of fine-grained, schistose rock. 2 Four or five ore bodies known, some probably with higher gold and lower base metal grades, but only one with a reported resource estimate. 3 Only the mined tonnage has been reported; there probably are resources at depth, but their volume is unknown. 4 Also contains 39.4% Fe. 16 Pasi Eilu & Tero Niiranen (ed.)
Table 2. Selected, potentially significant gold (± base metal) occurrences without a resource estimate in the Central Lapland greenstone belt (CLGB) and Peräpohja schist belt (PSB). Name Best section Host rocks Siting of gold Reference CLGB Aakenusvaara Harrilommol Kellolaki 20 m at 6.0 g/t Au, 0.1% Cu; 6.4 m at 7.3 g/t Au, 0.05% Cu 3 m at 5.0 g/t Au; 12 m at 0.51 g/t Au, 0.16% Cu 5 m at 10.00 g/t Au; 5 m at 7.46 g/t Au Albitised phyllite Similar to Saattopora? Lahtinen et al., unpublished report 2005) Albitised phyllite Similar to Saattopora Korvuo (1997) (Table 1)? Mafic volc. rocks Native gold assoc. Talikka & Eilu (2011) with pyrite? Kerolaki 1 m at 12.6 g/t Au Chert Native gold inclusions in arsenopyrite; also free gold? Kiimakuusikko Kiimalaki Muusanlammit Naakenavaara Palolaki 3.45 m at 3.94 g/t Au; grab samples up to: 3.82 g/t Au, 954 g/t Ag, 0.36% Cu, 8.09% Pb, 0.42% Zn, 1.97% Sb 10.6 m at 4.86 g/t Au; 11.7 m at 4.5 g/t Au 4.8 m at 1.0% Cu; several 1.5 m sections at 2–7 g/t Au and 5–14 g/t Ag. 1 m at 1–10 g/t Au; 15 m at 0.3% Cu 1 m at 1.6 g/t Au; 1 m at 1.1 g/t Au, 1.3 g/t Pd, 0.37 g/t Pt Albitised qtzfsp-porphyry Albitised qtzfsp-porphyry Phyllite, intermed. tuffite Native gold assoc. with pyrite? Native gold assoc. with pyrite? Hulkki et al. (2010) Talikka & Eilu (2011) Talikka & Eilu (2011) Not reported Reino 1976, unpublished report, Outokumpu Mining Oy Albitised phylite Free native assoc. with gangue and sulphides Keinänen (2002) Intermed. tuffite Not reported Hulkki (2002), Hulkki et al. (2010) Pikku-Mustavaara 5 m at 2.8 g/t Au, 0.3% Cu Albitised phylite Free native assoc. with sulphides Ruosselkä Sukseton Tuongankuusikko 7 m at 13.7 g/t Au; 6 m at 4.8 g/t Au 4.6 m at 2.8 g/t Au; 6.48 m at 0.35 g/t Au, 0.61% Cu 28 m at 0.41 g/t Au, 1.36% Cu, 0.14% Ni; 1 m at 1–4 g/t Au Phyllite, Mafic volc. rocks Intermed. tuffite Free native assoc. with gangue and sulphides Free native assoc. with gangue and arsenopyrite Keinänen (1990) Pulkkinen et al. (2005) Korkalo (2006) Phyllite Not reported Korkalo (2006) PSB South Rompas 6 m at 617 g/t Au Mafic volc. rocks, Calc-silicate rocks North Rompas 1.40 m at 2529 g/t Au, 5.1% U 3 O 8 (channel sampling) Mafic volc. rocks, Calc-silicate rocks Free native assoc. with uraninite Free native assoc. with uraninite www. mawsonresources. com www. mawsonresources. com Excursion Guidebook FIN1 17
Page 1 and 2: 12th Biennial SGA Meeting 12-15 Aug
Page 3: Excursion Guidebook FIN1 Gold depos
Page 7 and 8: Contents Programme ................
Page 9 and 10: Saattopora Levi Suurikuusikko (Kitt
Page 11 and 12: Timanide orogen 500 km Murmansk Lap
Page 13 and 14: Metallogenic Areas and Mineral Depo
Page 15 and 16: 24°0'0"E 26°0'0"E 68°0'0"N Suuri
Page 17: 24°0'0"E 25°0'0"E 26°0'0"E N Rom
Page 21 and 22: stone Belt (CLGB). The CLGC is geol
Page 23 and 24: schist to upper amphibolite facies.
Page 25 and 26: of Ag, Au, As, CO 2 , K, Rb, S, Sb
Page 27 and 28: 3472000 3476000 3480000 3484000 750
Page 29 and 30: 30% decrease in net volume. Amphibo
Page 31 and 32: 7525300 A’ 3391900 3390500 A 200
Page 33 and 34: eralisation took place at 300-350
Page 35 and 36: comm. 2002). Ore-grade rock was fou
Page 37 and 38: Figure 18. Loading ore. Underground
Page 39 and 40: from progressive alteration of mafi
Page 41 and 42: least 25 km (Fig. 15). The dip of t
Page 43 and 44: Table 4. Alteration minerals presen
Page 45 and 46: tober 15, 2012 (Fig. 28). The prese
Page 47 and 48: 3 395 000 mE 3 400 000 mE 3 405 000
Page 49 and 50: ciated with the gold and uraninite.
Page 51 and 52: Table 6. North Rompas drilling inte
Page 53 and 54: Grönholm, P., 1999: The mesotherma
Page 55 and 56: J.S., Siedlecka, A. & Solli, A., 19
Page 57: Sorjonen-Ward, P., Ojala, V.J. & Ai

Gold deposits in northern Finland - Arkisto.gsf.fi

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