The Kevitsa Ni-Cu-PGE sulfide

deposit, northern Finland

S.H. Yang, K. Luolavirta, E. Hanski

Department of Geoscieneces, University of Oulu, Finland

W.D. Maier

Cardiff University, UK

Y. Lahaye, H.O. Brien

Geological Survey of Finland, Espoo

M. Lappalainen, F. Santaguida, S. Määttä, T. Voipio

First Quantum Minerals Ltd, FQM FinnEx Oy, Finland

Age: 2.058 Ga

Kevitsa: 240 Mt

0.3% Ni, 0.41% Cu

Pt 0.21 ppm,

Pd, 0.15ppm,

Au, 0.11 ppm

Sakatti: comparable to

Kevitsa, but higher grade

Lomalampi: Ore body

- Thickness: 10-20 m

- Strike length: 390 m

- Averaging:

Pt 0.27 ppm

Pd 0.12 ppm

Ni 0.17 % Cu 0.025%

Large volume mafic-ultramafic magma and sulfide-bearing sedimentary rocks

provide the region a great potential for Ni-Cu-PGE suflide mineralization

Lomalampi

Sakati

2.06 Ga Hanski et al., 2001

Age of Komatiite:

240 Mt Ni: 0.3%

Cu: 0.41%

•Country rocks

Sulfide-bearing black schist

Sedimentary-

volcanic formation

Country rocks:

Luolavirta et al., 2014

Cross section

Pyroxenite

Olivine

pyroxenite

Marginal (ol)

websterite &

gabbro

Dunitic

inclusions

Plag. bearing (ol)

websterite, gabbronorite

and microgabbro

Gabbro

Footwall Dunite Country rock

Metavolcanics and

sedimentary

Central Dunite

Mined

sequence

200 m

Pyroxenite

Olivine

pyroxenite

Marginal (ol)

websterite &

gabbro

Dunitic

inclusions

Plag. bearing (ol)

websterite, gabbronorite

and microgabbro

Footwall Dunite Country rock

Metavolcanics and

sedimentary

Central Dunite

Mining

sequence

200 m

Olivine

pyroxenite

Marginal (ol)

websterite &

gabbro

Dunitic

inclusions

Plag. bearing (ol)

websterite, gabbronorite

and microgabbro

Footwall Dunite Country rock

Metavolcanics and

sedimentary

Central Dunite

Mining

sequence

200 m

Luolavirta et al., 2014

Pyroxenite

Marginal (ol)

websterite &

gabbro

(ol) websterite

Gabbroic

rocks

Footwall Dunite Country rock

Metavolcanics and

sedimentary

Central Dunite

Mining

sequence

200 m