Kangasjärvi VMS Belt
The 100
km long Kangasjärvi Belt comprises a discontinuous sequence of highly
metamorphosed, Mid-Proterozoic, supra-crustal volcanic and sedimentary
rocks within the Central Ore Belt of Finland. It hosts a number of
important known massive sulfide base metal deposits, one of which is
the Pyhäsalmi Mine which has been in production since 1954 and contains
some 75 million tons of copper-zinc-silver ore. Other significant
deposits are the unmined resource at Säviä (4.4 million tons of 1.4% Cu
to 500 m level and very similar in geology and alteration to the Geco
Mine at Manitouwadge, Ontario) and Kangasjärvi, from which Outokumpu
mined a small amount of high-grade zinc ore in open pit in the early
1990’s.
Magnus Minerals land holdings in the Kangasjärvi Belt
include claim reservations, as well as claims and claims pending, over
the Kangasjärvi deposit and the Räsysuo deposit 1km to the SE. In
the southern part of the Belt, Magnus has claim applications over the
Leväniemi VMS copper deposit and Säviä ore body extensions.
At
Vuohtojoki, some 40 km north of the Pyhäsalmi Mine, Magnus Minerals
holds claims over most of the down-dip and strike extensions of a
cordierite-rich Zn-Ag-Cu VMS deposit within a sequence of altered
felsic and mafic volcanics. Drill-indicated resources are about
412,000t of 3% Zn, 10g/t Ag from surface to the 60 m level. Part of the
deposit is covered by a claim held by Pyhäsalmi Mines. |
|
Kangasjärvi Mine
Quick Facts:
- Zn-Ag massive sulfides
- Remaining drill-indicated resource of 300,000t @ 5.4% Zn, 0.04% Cu and 0.3g/t Au and open at depth
- Total production 89,000 t @ 5.12% Zn, 0.06% Cu, 41 g/t Ag from open pit
- 34 holes drilled totalling 7,407m including potential extensions
- Estimation and feasibility studies by Outokumpu
|
|
Exploration History
Most
of the exploration work done in the Kangasjärvi area was by GTK
(1961–1969, 1977–1985, 1998–2003); these included boulder tracing, till
stratigraphy, geochemical surveys, bedrock mapping, gravimetric,
magnetic and electric multi-frequency ground surveys, diamond drilling,
and litho-geochemical survey.
Geology
The
deposit is located in a syn-formal, volcanic, calc-alkaline-dominated
sequence, characterized by felsic and mafic volcanics with a minor
volume of intermediate volcanics. The mafic rocks in the sequence are
tholeiitic, whereas the felsic and intermediate volcanics are
calc-alkaline. Mineralization comprises massive sulfides lenses dipping
steeply SW and plunging NE.
Potential
Mineable
massive sulfide resource has been defined from 60m to the 200m level
and open down plunge extension and along the strike. Best section
encountered at depth was 8m @ 7.98% Zn, 0.15% Cu, 1.5 g/t Ag, 0.4 g/t
Au. Surface ore indications at Räsysuo deposit in rocks similar to
kangasjärvi add to the potential of this property. |
|
|
|
|
|
|