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THE ORE DATABASE
Occurence 5033 - 006 Flo
(Object Id: 4426)
(Last updated: 12.09.2023)
Location
County: Trøndelag Municipality: Tydal (5033)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 636217 m. North: 6978980 m.
Longitude: 11.6820470 Latitude: 62.9152000
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis Co
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production:


Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Volcex Form:
Main texture: Structureless Min. distribution: Massive (>50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration: Chloritisation
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Røros Nappe Complex
Tectonic complex:
Igneous complex:
Group: Aursund Formation: Røsjø

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Biotite Subordinate mineral (1-10%)
Gangue mineral Amphibole Subordinate mineral (1-10%)
Gangue mineral Chlorite Subordinate mineral (1-10%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Magnetite Subordinate mineral (1-10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Pyrite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Wall rock Kvarts-biotitt skifer Sedimentary
Original rock :Greywacke
Metamorphic facies :Amphibolite
Wall rock Kvartsittisk sandstein Sedimentary
Original rock :Greywacke
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :10 / 90 Post-mineralisation ;...Effect :Modifies
Wall rock Axial plane cleavage Strike/Dip :358 / 45 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format
Free text
Flogruva med en rekke synker og skjerp ligger ved den lille elva Fremmergrøna og danner den sørlige fortsettelsen av Grønskardfeltet (ST0223). Hovedgruva ligger rett på nordsida av elva og ca. 400 m sør for Grønskar I . Mindre synker og skjerp finnes videre sør for elva over en lengde på ca. 600 m. Enkleste adkomst er via bomvei fra Lauvøya i Tydal opp til Grønsjøen. Derfra går det en sti langs sjøen og sørover mot feltet og videre til Kjøli. Feltet ligger 3,5 km sør for Grønsjøen i åpent fjellterreng. Flogruva består av en skråsynk som skal være drevet langs malmsona mot vest og en loddsjakt ned til den samme sona. Malmsona ble ikke påvist ved disse åpningene, men kan studeres ved en ca. 60 m lang og 1-2 m høy dagskjæring nord for disse. Magnetkis-kobberkis breksjetype malm (prøve .01) opptrer i tilknytning til relativt bløt kvarts-biotitt skifer. Bergartene er sterkt deformert i dette området med en utprega kløv (358°/45°), og malmsona har uregelmessig form. En mulig folding av sekvensen indikeres også av foliasjonen lengst øst i skjæringa (288°/30°), mens psammitten sør for synkene har strøk/fall 10°/90°. Breksjetype magnetkis-kobberkis malm (.02) finnes også på tippen, men sulfidene også opptrer som bånd/striper i magnetittrike prøver (.03).

Photo(s) from the Deposit area:
Photo no. 1 showing Flogruva"
Photo no. 2 showing Grønskardfeltet"
Photo no. 3 showing Flogruva"

Bibliography:
From NGU's Reference Archive:
Aasgaard, Gunnar , 1927
Gruber og skjerp i kisdraget Øvre Guldal-Tydal.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.129;1-196 pages
Abstract:
The occurences described in this paper form a connection between th mining districts around Røros to the south and those around Meråker to the north. The occurences lie in mountain regions partly above the forest line. The list on page 12 contains the names of all known occurrences of whatever size within the district considered. Pl. I is a geological outline map of the district, compiled from maps in the Norwegian Geological Survey. In a geological summary on pages 18-27 it is shown that no pyrite occurrences of economic importance so far have been found in an eastern zone along the Swedish boundary where the rocks consist of hard schist with sparagmites, and igneous rocks. Neither have such occurrences been found in a zone of "Stuedalsskifer" and an other zone of "Gulaskifer" towards west, both indicated on the map. The occurrences of pyrite are chiefly found in connection with fine grained, light green or gravish, partly feldspar bearing schist and in connection with green schists, mostly fine grained hornblende schists. All these zones of schist gnereally strike north and dip west. The pyrite bearing schist lie on both sildes of a large zone of igneous rocks extending from Kjølifjell in the south over Hyllingen and Melshogna to Fangen in the Meråker district in the north.

Rui, Ingolf J.; Bakke, Inge , 1975
Stratabound sulphide mineralization in the Kjøli area, Røros district, Norwegian Caledonides.
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.55 (1);51-75 pages
Abstract:
Two important sulphide ore-bearing formations have been recognized in the Cambro-Silurian succession of the Røros district. One is composed of submarine greenstones and quartz keratophyres (the Hersjø Formation). The other one, which is studied here, consists of a heterogeneous series of banded meta-argillites and meta-greywackes with subordinate thin green interlayers of probable volcanogenic origin (the Røsjø Formation). These two formations are embedded in a thick succession of various clastic sedimentary rocks which have undergone metamorphism and folding during the Silurian orogeny. The numerous sulphide deposits which occur in the Kjøli area are largely confined to the Røsjø Formation. The sulphide bodies are chiefly composed of massive pyrite and/or pyrrhotite showing variable chalcopyrite and sphalerite grades. The massive sulphides often occur as thin, extensive sheets, locally as irregular, small lenses which rarely exceed one metre in thickness. It is probable that the sulphides have been precipitated primarily on the sea-floor, but there is no clear evidence of a volcanogenic origin. Local discordant relationships between the massive sulphides and the wall rocks are ascribed to metamorphic mobilization of the sulphides. The thicker sulphide lenses may themselves represent mobilized portions of thinner sulphide-rich units.

Fieldsamples
Sample No. Sample type Miscellanrous
ST0224.02 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Magnetkis-kobberkis breksjemalm med pyritt striper
No. of registrated element analyses = 2
ST0224.03 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Massiv magnetitt med striper/-flammer med kobberkis og magnetkis
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Flo, dagskjæring
(Object Id: 10182 6,00,01)
Location
County: Trøndelag Municipality: Tydal (5033)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 636187 m. North: 6979020 m.
Longitude: 11.6814950 Latitude: 62.9155670
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis


Fieldsamples
Sample No. Sample type Miscellanrous
ST0224.01 Bedrock
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Magnetkis-kobberkis breksjemalm i biotitt-kvarts-klorittskifer, god kobberkis-mineralisering
No. of registrated element analyses = 2
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Flo II
(Object Id: 10183 6,01,00)
Location
County: Trøndelag Municipality: Tydal (5033)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 636250 m. North: 6978845 m.
Longitude: 11.6825800 Latitude: 62.9139820
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
En 7x9 m vannfylt synk/skjerp ligger ca. 70 m sør for elva Fremmergrøna og ca. 200 m sør for Flogruva. Mørk grønn amfibolittisk bergart med foliasjon 173°/20° er blottet i nordøstkanten av dette, mens malmsona er ikke synlig. På tippen dominerer magnetkis rike stuffer med varierende innhold av kobberkis. Breksjetype malm er vanlig (prøve .06), mens innholdet av kobberkis øker i tilknytning til grovkornete kvartsårer (.04-.05). Dette indikerer større grad av mobilisering av malmen i forbindelse med disse kavtsgangene.

Photo(s) from the Deposit area:
Photo no. 1 showing Flo II, synken"

Fieldsamples
Sample No. Sample type Miscellanrous
ST0224.04 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Massive bånd/aggregater av magnetkis-kobberkis rundt kvartsøyne og klorittfragmenter
No. of registrated element analyses = 2
ST0224.05 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Magnetkis-kobberkis aggregater/strenger i grovkornet kvarts
No. of registrated element analyses = 2
ST0224.06 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Magnetkis-kobberkis deformert breksjemalm med utdratte bergartsfragmenter
No. of registrated element analyses = 2
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Flo skjerp 1
(Object Id: 10184 6,02,00)
Location
County: Trøndelag Municipality: Tydal (5033)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 636311 m. North: 6978550 m.
Longitude: 11.6835480 Latitude: 62.9113090
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Et mindre skjerp (4x5 m) er skutt inn i på østsida av en mindre knaus. Det ser ut til at de har fulgt en 1 m bred sone med flere parallelle kvartsganger som er orientert 294°/90°. Kobberkis og magnetkis finnes som årer og aggregater i og langs kvartsgangene (prøve .07) som er omgitt av kloritt rik randsone. Gangene er orientert tilnærmet normalt foliasjonen i kvarts-biotitt skiferen (215°/20°).

Photo(s) from the Deposit area:
Photo no. 1 showing Flo skjerp 1, 2 og 3"

Fieldsamples
Sample No. Sample type Miscellanrous
ST0224.07 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Kobberkis-magnetkis årenett/aggregater i/langs grovkornet kvarts
No. of registrated element analyses = 2
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Flo skjerp 2
(Object Id: 10185 6,03,00)
Location
County: Trøndelag Municipality: Tydal (5033)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 636316 m. North: 6978522 m.
Longitude: 11.6836170 Latitude: 62.9110610
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Skjerpet består av en 4x3 m relativt dyp, vannfylt skråsynk. En opptil 1 m bred rustsone er blottet i sørveggen, men den rikere malmsona er kun 10 cm bred og omgitt av kloritt og granat rik sone. Malmsona opptrer parallelt foliasjonen (174°/30°) til vertsbergarten som utgjøres av en kvartsrik psammitt med varierende glimmerinnhold. En prøve av typisk magnetkis-kobberkis breksjetype malm er innsamlet fra tippen (prøve .08).

Fieldsamples
Sample No. Sample type Miscellanrous
ST0224.08 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Semi-massiv magnetkis-kobberkis breksjemalm med granat-amfibol-rik sidestein
No. of registrated element analyses = 2
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Flo skjerp 3
(Object Id: 10186 6,04,00)
Location
County: Trøndelag Municipality: Tydal (5033)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 636369 m. North: 6978458 m.
Longitude: 11.6846130 Latitude: 62.9104660
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Et mindre skjerp er skutt inn mot øst i en knaus ved kanten til ei myr. Malmsona er blottet i sørveggen av en 1 m dyp vannfylt grop. Den er minst 30 cm bred og består i hovedsak av massiv magnetitt med varierende mengder sulfider på årer og stikk (prøve .09). Vertsbergarten er fint båndet og dels sterk foldet (355°/15°) glimmer-kvarts skifer som er mer kloritt+granat rik nær malmsona. Denne kan følges flekkvis videre sørover og har orientering 190°/35°.

Fieldsamples
Sample No. Sample type Miscellanrous
ST0224.09 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Massiv, finkornet magnetitt malm med kobberkis-magnetkis årer/flater
No. of registrated element analyses = 2
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 5033 - 006 Flo

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#
ST0224.01 Bedrock 47748 1236 2 331 63 5.9 24.0
ST0224.01 Bedrock 41500 1025 5 308 55 5.2 21.0
ST0224.02 Dump 21234 1454 2 406 66 2.7 60.0
ST0224.02 Dump 21600 1380 4 404 61 2.4 58.0
ST0224.03 Dump 14194 484 2 61 9 1.5 8.0
ST0224.04 Dump 10722 923 2 257 57 .8 212.0
ST0224.04 Dump 8100 749 3 230 47 .7 243.0
ST0224.05 Dump 17380 993 2 136 32 .8 237.0
ST0224.05 Dump 17650 988 1 142 32 1.3 161.0
ST0224.06 Dump 8780 5191 2 293 86 .8 28.0
ST0224.06 Dump 7130 4840 2 289 82 1.0 20.0
ST0224.07 Dump 84449 2222 2 162 75 12.3 122.0
ST0224.07 Dump 88800 2050 4 141 58 12.8 132.0
ST0224.08 Dump 19297 2164 2 289 75 2.9 527.0
ST0224.08 Dump 17400 2100 3 312 78 2.9 566.0
ST0224.09 Dump 9580 3387 2 319 36 2.6 229.0
ST0224.09 Dump 9500 2620 7 266 27 1.9 207.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sn* Sb* Bi*
ST0224.01 .5 3.0 15 1.8 3 5.00 51 20
ST0224.01 2.5 .5 7 2.1 5 4.79 5 0 9
ST0224.02 .5 1.0 12 2.9 11 6.00 44 32
ST0224.02 2.5 1.0 5 3.4 10 4.89 5 0 24
ST0224.03 1.0 3.0 5 .1 5 0.50 39 2
ST0224.04 .5 1.0 18 2.2 21 3.00 56 71
ST0224.04 2.5 2.0 5 2.1 20 2.72 7 0 51
ST0224.05 .5 .5 8 3.1 15 2.00 22 38
ST0224.05 2.5 .5 2 3.0 10 1.38 4 0 27
ST0224.06 .5 .5 10 15.1 6 3.00 32 2
ST0224.06 2.5 2.0 3 13.9 5 3.84 8 0 10
ST0224.07 .5 1.0 10 11.6 2 3.00 48 31
ST0224.07 2.5 .5 3 10.2 10 2.35 16 0 16
ST0224.08 .5 7.0 3 8.7 37 0.50 15 25
ST0224.08 2.5 6.0 2 8.6 30 0.61 15 0 12
ST0224.09 1.0 2.0 6 9.4 3 1.00 33 5
ST0224.09 8.0 .5 1 8.6 5 1.30 7 0 14
------------------
Sample No. Se* Ga* Ge* In* S% V* Cr* Mn* Fe%
ST0224.01 15.80 91 67 419 30.32
ST0224.01 67.00 21.50 0.43 1.64 10.00 74 46 27.40
ST0224.02 19.60 61 46 302 37.30
ST0224.02 103.00 15.40 0.76 2.95 10.00 52 29 38.00
ST0224.03 3.69 83 5 116 54.96
ST0224.04 17.70 167 65 379 36.38
ST0224.04 76.00 15.05 0.50 0.89 10.00 138 43 33.70
ST0224.05 9.69 74 22 199 19.89
ST0224.05 49.00 8.31 0.31 0.98 8.84 70 15 21.30
ST0224.06 16.50 92 67 401 37.49
ST0224.06 75.00 19.00 0.84 4.50 10.00 80 41 36.80
ST0224.07 11.20 33 34 179 19.10
ST0224.07 58.00 6.66 0.30 5.64 9.45 30 21 17.70
ST0224.08 10.90 29 29 453 24.99
ST0224.08 69.00 13.15 1.02 5.08 8.88 50 33 33.60
ST0224.09 8.77 15 11 74 55.03
ST0224.09 30.00 42.80 3.01 5.23 6.52 21 1 50.00
------------------
Sample No. Th* U* W* Rb* Sr* Y* Zr* Nb* Ta*
ST0224.01 3.00 4.00 1 1.0
ST0224.01 4.28 1.80 0 1.4 6.8 10.0 39 5.40 0.41
ST0224.02 1.00 4.00 2 1.0
ST0224.02 2.66 0.90 0 3.8 1.8 6.5 24 3.90 0.26
ST0224.03 1.00 4.00 1 0.5
ST0224.04 1.00 4.00 6 1.0
ST0224.04 4.23 1.20 0 5.7 3.0 14.2 21 6.30 0.39
ST0224.05 1.00 4.00 1 1.0
ST0224.05 1.20 0.50 0 3.6 1.4 5.3 7 2.70 0.17
ST0224.06 3.00 4.00 1 0.5
ST0224.06 3.90 1.30 0 1.8 1.5 8.9 30 6.90 0.42
ST0224.07 1.00 4.00 1 0.5
ST0224.07 1.92 1.30 0 2.6 10.7 4.3 10 3.00 0.25
ST0224.08 3.00 4.00 1 3.0
ST0224.08 3.08 1.00 0 26.2 4.1 8.4 28 6.70 0.51
ST0224.09 1.00 4.00 1 0.5
ST0224.09 0.19 0.10 0 1.2 0.3 1.4 2 0.50 0.09
------------------
Sample No. Cs* La* Ce* B* Li* Be* Al* P* Sc*
ST0224.01 8.00 3
ST0224.01 0.83 10.80 23.90 2 1 4 300 8.90
ST0224.02 5.00 2
ST0224.02 1.00 7.30 16.30 0 0 3 230 6.30
ST0224.03 0.50 10
ST0224.04 9.00 9
ST0224.04 1.58 12.30 27.00 2 0 4 180 21.60
ST0224.05 0.50 4
ST0224.05 0.71 2.80 6.46 0 0 2 160 10.20
ST0224.06 11.00 2
ST0224.06 0.73 12.40 27.50 0 1 4 350 9.00
ST0224.07 1.00 2
ST0224.07 0.14 4.20 9.62 2 0 2 140 4.00
ST0224.08 7.00 2
ST0224.08 1.75 9.60 20.70 0 0 4 800 6.60
ST0224.09 0.50 2
ST0224.09 0.19 0.60 1.22 0 0 0 10 0.60
------------------
Sample No. Ti* Te* Hf* Re* Tl*
ST0224.01
ST0224.01 2390 7.26 1.00 0 0
ST0224.02
ST0224.02 1600 14.25 0.60 0 0
ST0224.03
ST0224.04
ST0224.04 2260 30.00 0.60 0 0
ST0224.05
ST0224.05 1010 15.30 0.20 0 0
ST0224.06
ST0224.06 2200 7.14 0.80 0 0
ST0224.07
ST0224.07 1210 16.85 0.30 0 0
ST0224.08
ST0224.08 1980 14.25 0.80 0 0
ST0224.09
ST0224.09 260 7.37 0.10 0 0

The fact sheet was created on 29.04.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
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