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THE ORE DATABASE
Occurence 5056 - 009 Skipnes
(Object Id: 4504)
(Last updated: 09.12.2021)
Location
County: Trøndelag Municipality: Hitra (5056)
Map 1:50000: Sør-Frøya (1422-3) Map 1:250000: Kristiansund
Coordinate system: EU89-UTM Zone 32
East: 481990 m. North: 7049900 m.
Longitude: 8.6372650 Latitude: 63.5767260
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe Kis
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Test mining Reserves: 40 thousand tons
Operating method: Open pit and underground mining Historical production: 2 thousand tons


Operations
From - To Activity Comments
1913 - 1913 Inspection Company/Institution :R.M. Black
1916 - 1916 Inspection Company/Institution :Ing. Smerling
1918 - 1919 Test mining Company/Institution :Svensk selskap
1937 - 1937 Test mining Company/Institution :Engelsk selskap
1993 - 1993 Inspection Company/Institution :NGU

Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Volcex Form: Lens
Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Trondheim Nappe Complex
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Epidote Major mineral (>10%)
Gangue mineral Pyroxene Subordinate mineral (1-10%)
Gangue mineral Plagioclase Subordinate mineral (1-10%)
Gangue mineral Amphibole Subordinate mineral (1-10%)
Gangue mineral Quartz Accessory mineral (<1%)
Ore mineral Magnetite Major mineral (>10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)
Ore mineral Pyrite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Wall rock granittisk gneis Extrusive
Metamorphic facies :Amphibolite
Wall rock granitt Intrusive
Original rock :Granite
Wall rock amfibolitt Extrusive
Original rock :Basalt
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :280 / 40

Information(s) in free text format
Free text
Hovedgruva ligger ytterst på et nes ved Straumsfjorden med grei adkomst over gården Skipnes sin utmark. 1907: innbydelse til aksjetegning, malmbergninger i 1913 og 1916 1918-1919: oppfaringsarbeid av svensk selskap ned til 30-40 m's dyp, ingen utskipning- I følge bergverksstatistikken; Norges Bergverksdrift ble det tatt ut ca. 2.000 tonn jernmalm i denne perioden. 1937: drift i 5 mnd. av et engelsk selskap I følge Bergarkiv rapportene er det sterkt varierende beregninger om forekomstens størrelse, fra 40.000 t til 7 mill.t. hvis alle forekomstene i området taes med (Skipnesskaget, Indre Skipnes, Trangotten og Bjørkeskogen). Skipnesskaget virker klart størst selv om det er umulig å beregne mengder da malmen ikke er blottet der i dag (1993). Skipnes indre består av et lite brudd (1x6 m) 6 m over flomålet. Malmen består av fink magnetitt med varierende sulfidinnhold og varierende mengde feltspat og mafiske mineraler; epidot, amfibol og pyroksen. Sidebergartene består av finkornete, felsiske gneisser og amfibolitter kan representere metavulkanitter.

Fieldsamples
Sample No. Sample type Miscellanrous
ST0303.01 Dump
Sampler: Sandstad, J.S./...Stored: Løkken
Comment: Magnetitt-malm, finkornet, massiv, med pyritt-striper (5%), noe grønn epidot-pyroksen?
No. of registrated element analyses = 1
ST0303.02 Dump
Sampler: Sandstad, J.S./...Stored: Løkken
Comment: Bånda magnetitt-malm, fin-middelskornet magnetitt, grønne skarnmineraler, lite sulfid
No. of registrated element analyses = 1
ST0303.03 Dump
Sampler: Sandstad, J.S./...Stored: Løkken
Comment: Sulfidrik, magnetkis+pyritt, i feltspat (rød) og epidot-pyroksen (grønn) skarnbergart, varierende magnetitt-innhold
No. of registrated element analyses = 1
TG90057 Bedrock
Sampler: Grenne, T.
Comment: Massiv mt-py-ep, samleprøve.
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Skipnes indre
(Object Id: 6674 9,01,00)
Location
County: Trøndelag Municipality: Hitra (5056)
Map 1:50000: Sør-Frøya (1422-3) Map 1:250000: Kristiansund
Coordinate system: EU89-UTM Zone 32
East: 482443 m. North: 7049584 m.
Longitude: 8.6464430 Latitude: 63.5739130
Show on map
Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
ST0303.04 Dump
Sampler: Sandstad, J.S./...Stored: Løkken
Comment: Magnetitt-malm, fink, pyritt-rike bånd, dels i skarnbergart, kuttes av kvarts+epidot åre
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 5056 - 009 Skipnes

Element analyses
( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)
Sample No. Sample Type Cu* Zn* Pb* Co* Ni* Ag* Au#
ST0303.01 Dump 849 75 15 101 111 -.2 -1.0
ST0303.02 Dump 145 69 15 64 32 -.2 -1.0
ST0303.03 Dump 1478 70 15 192 250 -.2 3.0
ST0303.04 Dump 814 61 17 98 83 -.2 -1.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sn* Sb* Bi*
ST0303.01 -5.0 -1.0 67 -1.0 -2 267.00 -20 6 15
ST0303.02 -5.0 -1.0 52 -1.0 -2 1.00 -20 -5 14
ST0303.03 -5.0 8.0 43 -1.0 3 12.00 -20 -5 14
ST0303.04 -5.0 -1.0 65 -1.0 -2 -1.00 -20 6 16
------------------
Sample No. V* Cr* Mn* Fe% W* Sr* La* Na* Mg*
ST0303.01 187 99 462 10.00 -20 25.0 39.00 -0 1
ST0303.02 185 86 484 10.00 -20 65.0 34.00 0 1
ST0303.03 68 145 735 10.00 -20 42.0 31.00 0 1
ST0303.04 158 162 341 10.00 -20 35.0 38.00 -0 1
------------------
Sample No. Al* K * Ca* Te*
ST0303.01 1 -0 0 -10.00
ST0303.02 1 0 1 -10.00
ST0303.03 2 0 1 -10.00
ST0303.04 1 -0 0 -10.00

The fact sheet was created on 03.05.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
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