New gold discovery in the

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New gold discovery in the Paleoproterozoic Mauken
greenstone belt
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Mauken greenstone belt
The Paleoproterozoic Mauken greenstone belt is
situated in an unexplored and untested terrain in
Northern Norway. The main economic mineral
potential in the Mauken prospect is associated
with orogenic and epithermal gold
mineralisation. Structurally the greenstone belt
is associated with two crustal scale deformation
and shear zones. The principal NW-SE direction
of the structures are analogue to the regional
deformation zones, faults and shear zones in
central Lapland, Finland, where a large number of
gold deposits are distributed along major
deformation zones.
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Regional setting
Modified after Koistinen et al. (2001).
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District setting
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Geology
The greenstone belt is dominated by basalts,
amphibolites, chlorite- and sericite schists with
lesser carbonate lenses and metaarkosic
sandstone. Silicification (i.e. addition of
silica), carbonatisation and quartz veining are
the dominating alteration types. The greenstone
belt is intruded by Paleoproterozoic 1.8 - 1.7 Ga
granodiorites. Metamorphic grades from
greenschist facies to lower amphibolite facies.
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Geology mineralisation
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Mauken greenstone belt

• The main economic mineral potential in the Mauken
  prospect is associated with orogenic and
  epithermal gold mineralisation.
• The deposit consists of three types of auriferous
  mineralisations
• silicification of mafic tuffites with
  gold-bearing arsenopyrite-pyrite mineralisation.
• gold-bearing arsenopyrite-pyrite en echelon
  quartz vein and quartz-stockwork gold mineralised
  system.
• shear-hosted gold-bearing chalcopyrite-pyrite
  mineralisation in a quartz-ankerite alteration
  system.

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Mineralisations and alteration
Close-up of gold mineralised arsenopyrite
(silvery needles) rich silicified rock.
Gold mineralised arsenopyrite-rich silicified
rock with secondary quartz veining.
Ankerite-calcite vein with late quartz fracture
fillings in sericite schist.
Fe-carbonate and magnetite alteration in breccia
form in pillow basalt unit.
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Grades
Mineralised surface rock samples have been
collected along a 1750 m almost straight
line. The typical Au content of the samples,
range between 1 - 4 ppm. Presently the maximum Au
grade is 5.79 ppm in a rock grab from an
arsenopyrite rich silicified amphibolite. The
dilatant zone with the en echelon quartz vein and
quartz stockwork systems show a remobilised
arsenopyrite, typical with an Au contant range
between 0.5 1.0 ppm. The shear zone hosted
schist with the ankerite-calcite alteration
system show a low-grade Au mineralisation, but
may prove to be significant in size.