Gold deposits in northern Finland - Arkisto.gsf.fi

A
B
C
Figure 27. Two back-scattered electron microprobe
images and one reflected light image of ore samples
in mafic host rocks. A. Nucleation (or recrystallisation)
of arsenopyrite in graphitic (black phase) milled zones
relating to shearing. B. A fractured competent rock
fragment with arsenopyrite associated with fracture
infill. A penetrative shear boundary is seen at the edge
of this mineralised fragment (center of photograph).
C. The host with abundant fine-grained auriferous
arsenopyrite-pyrite dissemination and a late, crosscutting
quartz-carbonate vein. Field of view in A and B
is 1.5 mm, but 4 cm in C.
alloys with Ag and Hg (Chernet et al. 2000).
Rare stibnite veins and amorphous grains contain
extremely high gold grades and overprint
the main ore-bearing sulphides.
Acknowledgements
Agnico Eagle is gratefully acknowledged for the
permission to publish the data and all the images.
The information in this summary reflects
the opinions of the authors only, unless otherwise
referenced. The majority of information is
based on data collected prior to 2005 (during
the exploration phase of the deposit preceding
mine development).
Rompas-Rajapalot gold-uranium
project, Peräpohja Schist Belt
Mawson Exploration Team and co-workers
The Rompas-Rajapalot gold-uranium project is
located in the Ylitornio municipality of northern
Finland at 66.45 °N and 24.75 °E, approximately
50 km west of the Rovaniemi town. The
initial discovery area, Rompas, was discovered
by AREVA Resources Finland Oy in September
2008 as part of regional uranium exploration.
Limited exploration was undertaken until
Mawson Resources purchased the exploration
assets of Areva in 2010. Mawson subsequently
defined more than 300 bonanza grade gold
occurrences of vein style mineralisation over a
6 km strike length. Diamond drilling in 2012
and early 2013 produced numerous Au-U intersections,
of which 6 metres at 617 g/t Au remains
the highlight. Rajapalot is a new grassroots discovery
made by Mawson, 8 km east of Rompas,
where a total of 52 outcrop grab samples to date
average 152.8 g/t gold and range from 0.001 g/t
to 2 817 g/t gold.
Mawson holds 833 claims and claim applications
for 75 340 hectares at the Rompas Project.
A total of 110 exploration claims that cover a
surface area of 10 580 hectares and form the core
claims at Rompas came into legal force on Oc­
42 Pasi Eilu & Tero Niiranen (ed.)