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THE ORE DATABASE | |||||
Deposit Area 1664 - 020 | |||||
(Last updated 05.jul.2023) |
Name of Deposit Area : Blomligruvene |
(Object Id : 1664,020,00,00) |
Location |
County : | Sør-Trøndelag (16) | Municipality : | Selbu (1664) |
Map 1:50000: | Stjørdal (1621-1) | Map 1:250000: | Trondheim |
Marking point: | Longitude: | 11.0665260 | Latitude: | 63.3043980 |
EU89-UTM Zone 32 | (Coordinates IS confirmed) |
X-coord: | 603570 m. | Y-coord: | 7021174 m. |
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Commodity |
Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Sulphides | |
Element(s): | Zn Cu Kis |
Production |
Activity: | Test mining | Reserves: | ||
Prod. method: | Underground mining | Production: | ||
Prod. status: | Volume of dump: | 150 m3 |
Importance |
Public: | (No data) |
Economical: | Minor interest , (Confirmed 15.jul.2020 by Jan Sverre Sandstad) |
Mineralization |
Era: | Paleozoic | Period: | Ordovician | |
Dating: | Method: | |||
Genesis: | Volcex | Form: | Lens | |
Main texture: | Banded | Min. distribution: | Massive (>50 % ore minerals) |
Main grain size: | Fine grained (< 1 mm) | Main alteration: | Sericitisation |
Strike/Dip: | 320 / 40 | Direction: | ||
Plunge: |
Stratigraphic classification of host rock |
Era: | Paleozoic | Period: | Ordovician |
Province: | Caledonides | |
Geotec.unit: | Trondheim Nappe Complex | |
Tectonic complex: | Gula Complex | |
Igneous complex: |
Group: | Formation: |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Quartz | Major mineral (>10%) | |
Ore mineral | Pyrrhotite | Major mineral (>10%) | |
Ore mineral | Sphalerite | Major mineral (>10%) | |
Ore mineral | Pyrite | Subordinate mineral (1-10%) | |
Ore mineral | Chalcopyrite | Accessory mineral (<1%) | |
Ore mineral | Arsenopyrite | Accessory mineral (<1%) |
Lithology: |
Relationship | Rock | Origin | |
Wall rock | Metagreywacke | Sedimentary Original rock :Greywacke |
|
Metamorphic facies :Greenschist |
Structures |
Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
Wall rock | Foliation | Strike/Dip :335 / 45 | Post-mineralisation ;...Effect :Modifies |
Information(s) in free text format |
Free text |
Blomligruvene ligger rett øst for gammelveien over Strandfjellet og består av to vannfylte synker. Gruva ble drevet av Mostadmark jernverk på midten av 1800-tallet. Den ene synken ligger 5 m øst for veien og har sidevegger på 6x3 m og den andre ligger 10 m lengre øst. Sterkt skifrig gråvakke er synlig i vestveggen i den vestlige synken, mens en 1,5-2 m mektig sulfidsone er blottet i nordveggen i den andre. Den består av massive til semi-massive bånd av pyritt, magnetkis og sinkblende i kvarts-rik grunnmasse og disseminasjon og årer av sulfider i kvarts-serisitt bergart. Tippene nedover skråningen er svært overgrodd, men relativt friske blokker ble prøvetatt og analyser viser at malmen er noe anriket på arsen. |
Bibliography: |
From NGU's Reference Archive: |
Torske, Tore , 1965 |
Geology of the Mostadmarka and Selbustrand area, Trøndelag. |
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.232;1-83 + ka pages |
Abstract: | |
The bedrock of the area consists of metamorphic epiclastic, volcanic, and intrusive rocks of assumed Lower Ordovician age, assigned to, and lithologically matching the rocks of, the Røros, Støren and Lower Hovin Groups of the Trondheim Region. A detailed petrographic description of the rock varieties is given. The metamorphic grade of all rocks corresponds to the Greenschist Facies. - Small ore deposits occur in connection with the volcanic rocks. They comprise pyrite-pyrrhotite ores of the Leksdal Type, mixed pyrite-magnetite ores, and iron oxide ores. - Lithological variations of the sedimentary rocks is tentatively correlated with events during the early periods of the Caledonian Orogeny. - The volcanism within the area seems to have started with a phase of explosive activity, followed by extrusion (mostly submarine) of copious amounts of spilitic lavas; towards the end of the main period of volcanism a new episode of explosive activity has produced what is called the upper pyroclastic horizon, comprising rocks ranging from coarse volcanic breccia to finegrained tuffs. - The intrusive rocks consist mainly of saussurite gabbros and quartz keratophyres. The latter are thought to be intrusive rather than effusive, and evidence is offered to support this. In some places the character of pyroclastic material points to a quartz keratophyre parentage. Thus, quartz keratophyres may have occurred both as intrusive and volcanic rocks. |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
Blomligruvene-1 | Dump |
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Blomligruvene-2 | Dump |
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Blomligruvene-3 | Dump |
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NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
from |
Deposit Area 1664 - 020 Blomligruvene |
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# |
Blomligruvene-1 | Dump | 2690 | 33400 | 136 | 68 | 21 | 2.2 | 111.0 |
Blomligruvene-2 | Dump | 2270 | 23300 | 91 | 26 | 23 | 2.8 | 184.0 |
Blomligruvene-3 | Dump | 2580 | 31200 | 179 | 91 | 27 | 6.0 | 104.0 |
------------------ |
Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sn* | Sb* | Bi* |
Blomligruvene-1 | -5.0 | 3.0 | 300 | 140.5 | 70 | 7.66 | 1 | 16 | 2 |
Blomligruvene-2 | 6.0 | 3.0 | 8340 | 84.4 | 30 | 23.40 | 5 | 27 | 1 |
Blomligruvene-3 | -5.0 | 2.0 | 1210 | 108.5 | 150 | 15.75 | 5 | 19 | 1 |
------------------ |
Sample No. | Se* | Ga* | Ge* | In* | S% | V* | Cr* | Mn* | Fe% |
Blomligruvene-1 | 14.00 | 7.68 | 0.08 | 1.15 | 10.00 | 43 | 10 | 314 | 32.90 |
Blomligruvene-2 | 11.00 | 17.90 | 0.05 | 0.75 | 10.00 | 139 | 20 | 323 | 26.60 |
Blomligruvene-3 | 13.00 | 22.20 | 0.07 | 0.33 | 10.00 | 194 | 24 | 269 | 23.40 |
------------------ |
Sample No. | Th* | U* | W* | Rb* | Sr* | Y* | Zr* | Nb* | Ta* |
Blomligruvene-1 | 0.44 | 0.90 | 0 | 8.2 | 20.0 | 4.9 | 41 | 1.00 | 0.06 |
Blomligruvene-2 | 0.58 | 2.90 | 1 | 33.1 | 52.1 | 10.2 | 86 | 2.40 | 0.14 |
Blomligruvene-3 | 1.01 | 2.20 | 1 | 76.8 | 56.1 | 13.8 | 149 | 7.40 | 0.31 |
------------------ |
Sample No. | Cs* | La* | Ce* | Li* | Be* | Na* | Mg* | Al* | P* |
Blomligruvene-1 | 0.58 | 8.80 | 16.95 | 7 | 0 | 6400 | 1200 | 13400 | 310 |
Blomligruvene-2 | 2.30 | 4.70 | 11.25 | 11 | 1 | 10000 | 2100 | 27500 | 1030 |
Blomligruvene-3 | 5.17 | 12.90 | 31.50 | 22 | 2 | 9200 | 2700 | 47400 | 1590 |
------------------ |
Sample No. | K * | Ca* | Sc* | Ti* | Te* | Hf* | Re* | Tl* | |
Blomligruvene-1 | 1800 | 800 | 4.80 | 500 | 1.10 | 0.90 | 0 | 0 | |
Blomligruvene-2 | 7200 | 2200 | 15.50 | 1330 | 1.02 | 1.90 | 0 | 0 | |
Blomligruvene-3 | 16600 | 3700 | 24.40 | 3060 | 0.52 | 3.60 | 0 | 1 |
The fact sheet was created on 19.05.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
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