Norsk versjon
THE ORE DATABASE
Occurence 5027 - 013 Fløttum
(Object Id: 4439)
(Last updated: 07.11.2023)
Drill Cores: Fløttum
Location
County: Trøndelag Municipality: Midtre Gauldal (5027)
Map 1:50000: Haltdalen (1620-1) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 587394 m. North: 6975451 m.
Longitude: 10.7195490 Latitude: 62.8985320
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn Cu Kis
Importance
Raw material meaning: Not Assessed (reg. 20.03.2017)

Resources and production
Activity: Test mining Reserves: 350 thousand tons
Operating method: Underground mining Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Ag 29 ppm 18.10.2012
Cu 0,96 % 18.10.2012
Zn 4,76 % 18.10.2012

Operations
From - To Activity Comments
1888 - 1892 Test mining Company/Institution :Røros Kobberverk
1890 - 1891 Core drilling Company/Institution :Røros Kobberverk
1904 - 1910 Test mining Company/Institution :Røros Kobberverk
1913 - 1913 Core drilling Company/Institution :Røros Kobberverk
1915 - 1917 Test mining Company/Institution :Røros Kobberverk
1949 - 1949 Geophysics Company/Institution :Geofysisk Malmleting
1952 - 1953 Core drilling Company/Institution :Røros Kobberverk
1953 - 1953 Geology Company/Institution :Ljøkjell, dipl. NTH
1970 - 1971 Geophysics Company/Institution :Røros Kobberverk/Terratest A/S
1974 - 1974 Geochemistry Company/Institution :Røros Kobberverk/Sydvaranger
1974 - 1974 Geophysics Company/Institution :Røros Kobberverk/Sydvaranger
1997 - 1997 Sampling Company/Institution :NGU-Malmreg.

Mineralization
Era: Paleozoic Period:
Genesis: Volcex Form: Layer
Main texture: Banded Min. distribution: Massive (>50 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration: Silicification
Strike/Dip: 110 / 30 Direction: 150
Plunge: 30
Stratigraphic classification of host rock
Era: Paleozoic Period:
Province: Caledonides
Geotec.unit: Trondheim Nappe Complex
Tectonic complex: Gula Nappe
Igneous complex:
Group: Gula Formation: Singsås

Mineralogy
Relationship Mineral Amount
Gangue mineral Muscovite Major mineral (>10%)
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Sericite Subordinate mineral (1-10%)
Gangue mineral Feldspar Subordinate mineral (1-10%)
Gangue mineral Graphite Subordinate mineral (1-10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Chalcopyrite Major mineral (>10%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Sphalerite Major mineral (>10%)
Ore mineral Galena Subordinate mineral (1-10%)
Ore mineral Pyrargyrite Accessory mineral (<1%)
Ore mineral Alabandite Accessory mineral (<1%)
Ore mineral Hessite Accessory mineral (<1%)
Ore mineral Molybdenite Accessory mineral (<1%)
Ore mineral Bismuth Accessory mineral (<1%)
Ore mineral Stannite Accessory mineral (<1%)
Ore mineral Tetrahedrite Accessory mineral (<1%)
Ore mineral Arsenopyrite Accessory mineral (<1%)
Ore mineral Mackinawite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Wall rock Glimmerskifer Sedimentary
Original rock :Greywacke
Metamorphic facies :Amphibolite
Wall rock Kvartsitt Sedimentary
Metamorphic facies :Amphibolite
Wall rock Grafittskifer Sedimentary
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Foliation Strike/Dip :110 / 30 Post-mineralisation ;...Effect :None
Host rock Fold axis Dir./Plunge :150 / 30 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format
Free text
The Fløttum Cu-Zn deposit is associated with black banded quartzite and carbonaceous phyllite. The deposit consists of four inclined and ruler-shaped ore lenses, which perhaps originally were parts of one body, but later were disrupted by folding. The sulphides are pyrite, pyrrhotite, sphalerite, chalcopyrite and accessory galena. Close to the ore lenses, there are glassy muscovite-bearing quartzitic schists, most likely formed by hydrothermal processes during ore formation. During exploration, a dipartite division was established with a footwall and a hanging-wall ore type. The hanging wall ore consists of pyrite and subordinate sphalerite, whereas the footwall ore consists of pyrrhotite, sphalerite, chalcopyrite, galena, fahlore and arsenopyrite. Total possible ore reserves are estimated to 350,000 t with 0.96 % Cu, 4.76 % Zn and 29 ppm Ag. The deposit has only been subject to test mining.

Bibliography:
From NGU's Reference Archive:
Gullichsen; Getz; Dalseth; Kvalheim , 1916
Fløttum Gruver.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 706;17 pages

Bøckman, K.L. , 1938
Fløttum gruve.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 705;5 pages
Abstract:
Rapporten er en uttalelse til styret for Røros Kobberverk. Rapporten er en gjennomgåelse av årsberetninger fra gruben fra 1888-1892 og 1904-1917. Det foreslås over for styret, på grunnlag av det framlagte materialet at det innledes forhandlinger med intresserte parter om håndgivelse av Fløttum grube for salg eller bortleie mot royalty.

Holmsen, P. , 1939
Fløttum Gruver.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 707;5 pages
Abstract:
Det er gjort vurdering av Røros kobberverks materiale angående gruben. Det påpekes at det må være et interessant grubeprosjekt. Oppfart malmkvantum er sikkert 150 000 tonn. Malmen har gull og sølvholdig arsenkis, sinkblende og nyrer av sølvholdig blyglans. Det kan bli snakk om utvinning av følgende mineralkonsentrat: Blykonsentrat med et visst innhold av sølv. Kobberkons. med sølv. Sinkkonsentrat med sølv, svovelkiskonsentrat og arsenkiskonsentrat med et visst gullinnhold. Malmen er meget kompleks og setter de største krav til oppredningsteknikken. Rapporten har også analyseresultat og tabeller fra flotasjonstester.

Nilsen, Odd , 1978
Caledonian sulphide deposits and minor iron-formations from the southern Trondheim region, Norway.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.340;35-85 + k pages
Abstract:
Within the southern and central parts of the Trondheim region of the Norwegian Caledonides a great number of small, stratabound cupriferous pyrite deposits are confined to mafic metavolcanics of the Gula, Støren and Fundsjø Groups of the Lower Palaeozoic succession. The deposits occuring within, or in close contact with the metavolcanics are characterized by their association with minor manganiferous oxide/silicate iron-formations - better known as "vasskis" ore type - within the metamorphic low-grade areas. The iron-fprmations of the metamorphic higher grade terrains on the other hand, which are extensively developed within the Gula Group, are mostly of a pyrrhotitic sulphide/silicate type and sulphurization processes are thought to have played an important role during the metamorphism. The pyrite deposits occurring adjacent to the metavolcanics bear no relationship to the iron-formations. They are embedded in pelitic, often carbonaceous assemblages (Gula Group) or within tuffitic members of the volcanogene Støren Group, and they are thought to represent re-sedimented (reworked) deposits. The pyrite deposits display varying degree of metamorphic reconstitution and a tectonic control has apparently determined their disc- or ruler-shaped morphology.

References not to be found in NGU's Reference Archive.:
Pettersen, Ø. 1971: Rapport over malmletingsarbeider 1970. BV 50A-C.


Gvein, Ø. 1990: Fløttumforekomsten i Midtre Gauldal, Sør-Trøndelag. Prospektering A/S rapp. nr. 2164. (BV 4143).


Juhava, R. 1991: Fløttum forekomst - et tolkningsforslag. BV 4150.


Ljøkjell, P. 1953: Fløttum gruve. Upubl. dipl.oppg. NTH.

Fieldsamples
Sample No. Sample type Miscellanrous
JS-G1902 Dump
Sampler: J.S. Sandstad/...Stored: Løkken/...Size(kg): 2
Comment: Massive sphalerite+galena ore
No. of registrated element analyses = 1
JS-G1903 Dump
Sampler: J.S. Sandstad/...Stored: Løkken/...Size(kg): 2
Comment: Massive pyrite-sphalerite ore
No. of registrated element analyses = 1
ST0237.TGST93.058 Dump
Sampler: Grenne, T.
Comment: Gjennomsnitt massivmalm
No. of registrated element analyses = 1
ST0237.TGST93.059 Dump
Sampler: Grenne, T.
Comment: Massiv sl-cp-po malm
No. of registrated element analyses = 1
ST0237.TGST93.060 Dump
Sampler: Grenne, T.
Comment: Massiv sl-py-gn malm, Zn-Pb-rik
No. of registrated element analyses = 1
ST0237.TGST93.061 Dump
Sampler: Grenne, T.
Comment: Massiv py-sl-qtz malm
No. of registrated element analyses = 1
ST0237.01 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Po-cpy-rik massivmalm
No. of registrated element analyses = 1
ST0237.02 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Cpy-dom. massivmalm
No. of registrated element analyses = 1
ST0237.03 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Samleprøve av massivmalm fra tipp.
No. of registrated element analyses = 1
ST0237.04 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Py-sl-dom. massivmalm
No. of registrated element analyses = 1
ST0237.05 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Py-sl-dom. massivmalm
No. of registrated element analyses = 1
ST0237.06 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Po-py-sl-cpy-ga- massivmalm
No. of registrated element analyses = 1
ST0237.07 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Zn-rik sl-py-massivmalm
No. of registrated element analyses = 1
400011 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
400012 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
400013 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
400014 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
400015 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
400016 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
400017 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
400018 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality:
(Object Id: 10108 13,01,00)
Location
County: Trøndelag Municipality: Midtre Gauldal (5027)
Map 1:50000: Haltdalen (1620-1) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 587316 m. North: 6975589 m.
Longitude: 10.7180870 Latitude: 62.8997850
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn Cu Kis
Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
JS-G1904 Dump
Sampler: J.S. Sandstad/...Stored: Løkken/...Size(kg): 2
Comment: Semi-massive/aggregates of chalcopyrite-sphalerite, medium to coarse grained
No. of registrated element analyses = 1
JS-G1905 Dump
Sampler: J.S. Sandstad/...Stored: Løkken/...Size(kg): 2
Comment: Massive sphalerite-chalcopyrite-pyrite ore, fine to medium grained
No. of registrated element analyses = 1
JS-G1906 Dump
Sampler: J.S. Sandstad/...Stored: Løkken/...Size(kg): 2
Comment: Massive sphalerite-chalcopyrite-pyrrhotite ore
No. of registrated element analyses = 1
JS-G1907 Dump
Sampler: J.S. Sandstad/...Stored: Løkken/...Size(kg): 2
Comment: Massive sphalerite-chalcopyrite-pyrite ore
No. of registrated element analyses = 1
JS-G1908 Dump
Sampler: J.S. Sandstad/...Stored: Løkken/...Size(kg): 2
Comment: Semi-massive pyrite ore, fine grained in white rock
No. of registrated element analyses = 1
JS-G1909 Dump
Sampler: J.S. Sandstad/...Stored: Løkken/...Size(kg): 2
Comment: Semi-massive/aggregates of sphalerite, medium to coarse grained
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 5027 - 013 Fløttum

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#
JS-G1902 Dump 5130 195000 2430 38 46 42.4 79.0
JS-G1903 Dump 1395 137000 653 139 19 12.7 81.0
JS-G1904 Dump 59700 44100 3500 14 27 163.0 1190.0
JS-G1905 Dump 17500 158000 3350 16 56 48.6 69.0
JS-G1906 Dump 8950 70500 537 9 53 15.5 34.0
JS-G1907 Dump 95600 91500 2100 110 17 148.0 196.0
JS-G1908 Dump 193 3350 57 75 11 1.9 17.0
JS-G1909 Dump 2840 21600 82 37 53 5.6 25.0
ST0237.TGST93.058 Dump 9149 86488 3672 101 21 56.3 53.0
ST0237.TGST93.059 Dump 29600 97394 2198 7 58 40.5 56.0
ST0237.TGST93.060 Dump 2937 99999 13955 28 8 169.0 580.0
ST0237.TGST93.061 Dump 1922 39751 61 44 3 6.0 48.0
ST0237.01 Dump 29212 81796 2318 6 57 43.3 94.0
ST0237.02 Dump 99999 20603 150 105 19 175.8 951.0
ST0237.03 Dump 33608 95348 2042 104 38 61.0 397.0
ST0237.04 Dump 5424 99999 155 42 5 6.0 16.0
ST0237.05 Dump 1055 99999 228 17 4 -.3 17.0
ST0237.06 Dump 6321 17952 704 137 45 19.0 108.0
ST0237.07 Dump -1 99999 2059 44 7 5.7 32.0
400011 Dump 78500 101300 997 99 19 56.9 409.0
400012 Dump 6567 147700 110 154 22 6.4 64.0
400013 Dump 12000 112400 3749 204 20 28.8 97.0
400014 Dump 874 329500 2934 19 8 15.1 87.0
400015 Dump 26600 6060 795 30 11 27.9 450.0
400016 Dump 18900 99000 194 18 38 7.4 110.0
400017 Dump 16600 213400 342 13 34 17.4 142.0
400018 Dump 762 287000 3652 36 12 32.4 96.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sn* Sb* Bi*
JS-G1902 -5.0 -1.0 30 650.0 10 41.10 13 7 75
JS-G1903 -5.0 2.0 387 409.0 30 79.60 20 6 10
JS-G1904 -5.0 5.0 1130 135.5 60 38.50 119 45 121
JS-G1905 -5.0 1.0 47 338.0 -10 43.80 63 7 74
JS-G1906 -5.0 1.0 5 179.0 10 21.20 25 4 17
JS-G1907 -5.0 2.0 508 289.0 30 47.50 53 17 37
JS-G1908 -5.0 -1.0 354 9.5 10 39.30 8 1 1
JS-G1909 -5.0 3.0 30 54.6 10 16.15 3 2 8
ST0237.TGST93.058 232 213.5 -1 38.00 8 83
ST0237.TGST93.059 8 191.0 -1 21.00 2 87
ST0237.TGST93.060 173 675.1 5 84.00 25 301
ST0237.TGST93.061 264 81.4 -1 6.00 -2 -2
ST0237.01 -1.0 -1.0 2 227.1 4 25.00 -3 84
ST0237.02 1.0 -1.0 581 88.1 13 12.00 53 24
ST0237.03 3.0 -1.0 259 231.0 -1 16.00 16 58
ST0237.04 1.0 -1.0 193 343.8 -1 10.00 -3 13
ST0237.05 -1.0 1.0 169 739.7 4 3.00 -3 9
ST0237.06 6.0 10.0 98 62.4 7 2.00 -3 37
ST0237.07 1.0 -1.0 175 1201.0 4 4.00 -3 32
400011 286 252.8 3 33.00 11 16
400012 304 351.9 3 36.00 3 3
400013 264 176.7 16 10.00 10 89
400014 31 877.4 13 122.00 3 107
400015 133 27.9 37 13.00 9 13
400016 40 184.8 1 7.00 5 6
400017 166 347.5 2 13.00 6 10
400018 172 677.4 7 154.00 8 49
------------------
Sample No. Se* Ga* Ge* In* S% V* Cr* Mn* Fe%
JS-G1902 22.00 28.90 0.36 19.60 10.00 21 8 1620 24.60
JS-G1903 50.00 30.40 0.50 11.80 10.00 33 5 800 26.30
JS-G1904 82.00 32.20 0.30 12.10 10.00 32 6 876 20.40
JS-G1905 52.00 22.30 0.52 5.04 10.00 25 4 1640 32.10
JS-G1906 56.00 10.60 0.64 5.87 10.00 19 6 935 41.70
JS-G1907 56.00 24.80 0.52 5.97 10.00 14 5 679 28.70
JS-G1908 32.00 0.99 0.09 0.71 10.00 3 5 141 29.20
JS-G1909 62.00 5.42 0.54 6.01 10.00 9 8 482 34.00
ST0237.TGST93.058 15 3 712 26.92
ST0237.TGST93.059 13 -1 1435 32.51
ST0237.TGST93.060 27 8 1051 9.24
ST0237.TGST93.061 1 -1 332 22.61
ST0237.01 27.80 13 2 1589 44.12
ST0237.02 27.30 9 -1 446 32.88
ST0237.03 30.70 14 5 805 40.82
ST0237.04 44.50 11 11 775 18.40
ST0237.05 36.10 5 9 1433 16.47
ST0237.06 34.70 15 3 298 47.12
ST0237.07 36.00 4 10 1361 16.87
400011 13 38 726 10.00
400012 17 78 955 29.35
400013 17 72 463 38.57
400014 12 110 2305 6.17
400015 26 86 183 8.77
400016 16 36 904 10.00
400017 23 19 1272 10.00
400018 14 59 825 10.00
------------------
Sample No. Th* U* W* Rb* Sr* Y* Zr* Nb* Ta*
JS-G1902 0.21 1.30 1 3.5 36.3 5.4 9 0.20 -0.05
JS-G1903 0.19 1.70 3 10.8 22.5 5.6 13 0.20 -0.05
JS-G1904 1.16 1.70 3 27.6 44.8 15.7 93 1.50 0.13
JS-G1905 0.05 0.40 2 0.3 1.2 0.9 1 0.10 -0.05
JS-G1906 0.05 0.60 2 0.6 4.5 0.9 1 0.10 -0.05
JS-G1907 0.28 0.90 3 6.0 6.9 3.4 4 0.20 -0.05
JS-G1908 0.07 0.30 1 0.5 3.4 0.5 3 0.20 -0.05
JS-G1909 0.06 0.10 1 0.7 0.8 0.4 2 0.10 -0.05
ST0237.TGST93.058 2.00 -5.00 -2 12.0
ST0237.TGST93.059 2.00 -5.00 -2 1.0
ST0237.TGST93.060 2.00 7.00 5 26.0
ST0237.TGST93.061 -2.00 5.00 -2 8.0
ST0237.01 6.00 -8.00 -2 3.0
ST0237.02 5.00 -8.00 -2 2.0
ST0237.03 6.00 -8.00 -2 1.0
ST0237.04 4.00 -8.00 -2 1.0
ST0237.05 2.00 -8.00 -2 19.0
ST0237.06 8.00 -8.00 -2 1.0
ST0237.07 4.00 -8.00 -2 16.0
400011 6.0
400012 11.0
400013 8.0
400014 26.0
400015 38.0
400016 0.5
400017 0.5
400018 6.0
------------------
Sample No. Cs* La* Ce* B* Li* Be* Na* Mg* Al*
JS-G1902 0.33 2.50 5.94 2 0 0 0 0
JS-G1903 0.54 2.50 5.67 3 0 0 0 1
JS-G1904 4.05 9.10 26.60 24 1 0 1 3
JS-G1905 -0.05 -0.50 0.58 0 -0 0 0 0
JS-G1906 0.06 -0.50 0.79 1 -0 0 0 0
JS-G1907 0.19 1.40 3.06 2 -0 0 0 0
JS-G1908 -0.05 -0.50 0.62 1 -0 0 0 0
JS-G1909 0.05 -0.50 0.54 1 -0 0 0 0
ST0237.TGST93.058 1.00 -3
ST0237.TGST93.059 -1.00 10
ST0237.TGST93.060 3.00 -3
ST0237.TGST93.061 -1.00 -3
ST0237.01 -1.00 -3
ST0237.02 -1.00 -3
ST0237.03 -1.00 -3
ST0237.04 -1.00 -3
ST0237.05 1.00 -3
ST0237.06 -1.00 -3
ST0237.07 -1.00 -3
400011 0.50
400012 0.50
400013 1.00
400014 1.00
400015 4.00
400016 0.50
400017 0.50
400018 0.50
------------------
Sample No. P* K * Ca* Sc* Ti* Te* Hf* Re* Tl*
JS-G1902 200 0 3 0.80 0 7.70 0.30 13 1
JS-G1903 230 0 1 0.80 0 2.46 0.40 5 2
JS-G1904 130 1 1 4.10 0 37.20 2.50 7 35
JS-G1905 50 0 0 0.10 -0 11.25 -0.10 12 1
JS-G1906 40 0 0 0.20 -0 10.35 -0.10 7 0
JS-G1907 180 0 0 0.40 0 5.68 0.10 3 2
JS-G1908 10 0 0 0.30 -0 0.45 0.10 9 1
JS-G1909 20 0 0 0.10 -0 8.53 0.10 5 0
ST0237.TGST93.058
ST0237.TGST93.059
ST0237.TGST93.060
ST0237.TGST93.061
ST0237.01
ST0237.02
ST0237.03
ST0237.04
ST0237.05
ST0237.06
ST0237.07
400011 30
400012 30
400013 30
400014 30
400015 120
400016 30
400017 30
400018 30

The fact sheet was created on 29.04.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
Copyright © 2024 Geological Survey of Norway