Copperstone Exploration: Svartliden potentially a Cu Au porphyry deposit

Copperstone Resources AB

Copperstone Exploration: Svartliden potentially a Cu Au porphyry deposit

The Copperstone exploration area in Northern Sweden has been the subject of
several previous exploration programmes over approximately a 50 year period.
Drilling has intersected a significant number of high grade sulphide
mineralised zones, spread out over a 3x1 km area, bearing high grade
copper-zinc-silver-gold mineralisation. Despite these significant drilled
intersections, with excellent metal grades, there is currently no drill
indicated mineral reserve outlined to date. This is due to the lack of any
cohesive, interpretive exploration model for the drilled mineralisation and no
clear idea what might be the overall prospectivity and orebody potential of the

Drill hole data indicates that drilling programmes have been clustered around
early, well mineralised, drilled intersections or spread out to test discrete
geophysical anomalies. Mineralisation has been intersected immediately below
the overburden at sub-crop and down 200m into the bedrock. It occurs within
extensively altered mafic volcanic, volcaniclastic and volcanosedimentary rocks
below a variably thick glacial overburden forming an undulating surface

On a regional scale the mineralised andesitic volcanics and associated
sedimentary rocks are preserved as remnant zones within and between very large
granitic plutons that formed an integral part of the Proterozoic, ca. 1.8
billion year old volcano-plutonic arc now exposed in Northern Sweden. Despite
the antiquity of the region, the rocks and their contained hydrothermal
mineralisation, are very well preserved and indicate excellent prospectivity
for economic mineral resources. 

During 2015-2016 Copperstone has invested in new exploration drilling
programmes to further investigate and interpret historic drilled intersections
on the property. While drilling, down hole camera work and related analytical
studies have been employed to validate the considerable historic databases,
additional information has been gathered to formulate and test a new
exploration model. Despite the extensive databases for the earlier shallow
drilling programmes it is clear that the main prospectivity of the property,
and the opportunity to discover world-class mineralisation, lies below in
currently untested areas. 

Based on a complete re-evaluation of all data, it is concluded that the
property displays significant evidence of a porphyry-style copper-gold
mineralisation. The near-term exploration objective is to test this
interpretation to discovery, and while a positive outcome cannot be guaranteed
the exploration can nonetheless be clearly focused to quickly test this

World-wide exploration, discovery and exploitation of porphyry-style
mineralised systems have enabled them to be well understood, and their
characteristics well recognised. However despite being significantly large
mineralised systems with characteristic ore- body features, they are still
difficult to find as buried or blind orebodies. At Copperstone key features
characteristic of such mineralised systems have become more evident during, and
as a result of, the most recent exploration programmes. Based on this
recognition there is now the need to focus on evaluating this exploration model
to discovery. 

Key indicators of blind ore body potential still lying at depth include
characteristic geochemical alterations halos of good scale, related fertile
veining and the presence of a phreatomagmatic breccia diatreme directly
associated with metal sulphides. Breccia characteristics include milling of
altered wall rock fragments, the presence of feldspar xenocrysts, extensive
silicification and the abundance of high grade sulphide veining.  In addition
the model is supported by geophysical interpretations that suggest a deep
seated magnetic root from the postulated stock.  Overall the tectonic framework
is in keeping with the potential for hosting porphyry-styled hydrothermal
systems. Leading indicators to porphyry-style mineralization have been
identified resulting in the design of a drill campaign to discover and evaluate
this major opportunity for the Company. 

“There is extensive copper-silver-gold mineralization found in a raft of
historic boreholes drilled on the Copperstone project.  High grade
mineralization pockets may be linked to an unseen larger-scale igneous event.
This is exciting and is by far the most attractive exploration target for
Coppertone Resources to establish world-class precious and base metal resources
in Sweden” adds the lead project geologist Chris McKnight in a comment. 

 ”The potential we have been seeing for some time has now taken more
substantial form and of late we have received indications secure enough for us
to publish a well substantiated hypothesis worth validating and then verifying.
We look forward to the upcoming development with great interest” says Per Storm
in a comment. 

For more information, please contact Per Storm, Copperstone Resources AB,
0705–94 90 24, e-mail: 

Copperstone Resources AB (publ) is an exploration company focusing on the
Copperstone project in the vicinity of the Skellefte field. This project has
the potential to become one of the biggest base- and precious metal deposits in
the Nordic Region. 

Copperstone Resources has thirteen exploration tenements covering c:a 11 360
hectare and two mining concession and one applied concession covering a total
of 82 hectare. 

G&W Fondkommission is the Certified Adviser for Copperstone Resources AB.

This message has been approved by the Copperstone Resources qualified person of
Thomas Lindholm MSc, GeoVista AB.