Fact Sheet for <b>Occurence 5032 - 020 Blomligruvene</b>

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	THE ORE DATABASE
	Occurence 5032 - 020 Blomligruvene
	(Object Id: 37495) (Last updated: 05.07.2023)

Location

County:

Trøndelag

Municipality:

Selbu (5032)

Map 1:50000:

Stjørdal (1621-1)

Map 1:250000:

Trondheim

Coordinate system:

EU89-UTM Zone 32

East:

603570 m.

North:

7021174 m.

Longitude:

11.0665260

Latitude:

63.3043980

Show on map

Resource

	Resource Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Resource Subtype:	Sulphides
			Element(s):	Zn Cu Kis

Importance

Raw material meaning:

(No data)

Resources and production

	Activity:	Test mining	Reserves:
	Operating method:	Underground mining	Historical production:

Mineralization

Era: Paleozoic Period: Ordovician

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

Sampler: J.S.Sandstad/...Stored: Løkken/...Size(kg): 2

Comment: Massive, fine-grained pyrrhotite-sphalerite+pyrite

No. of registrated element analyses = 1

Blomligruvene-2 Dump

Sampler: J.S.Sandstad/...Stored: Løkken/...Size(kg): 2

Comment: Semi-massive, banded pyrite+pyrrhotite-sphalerite

No. of registrated element analyses = 1

Blomligruvene-3 Dump

Sampler: J.S.Sandstad/...Stored: Løkken/...Size(kg): 2

Comment: Semi-massive, banded pyrite-sphalerite

No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

Analyse Results

from

Deposit Area 5032 - 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

Era:	Paleozoic	Period:	Ordovician
Genesis:	Volcex	Form:	Lens
Main texture:	Banded	Min. distribution:	Massive (>50 % ore minerals)

	Province:	Caledonides
	Geotec.unit:	Trondheim Nappe Complex
	Tectonic complex:	Gula Complex
	Igneous complex:

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%)

Relationship	Rock	Origin
Wall rock	Metagreywacke	Sedimentary Original rock :Greywacke
		Metamorphic facies :Greenschist

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :335 / 45	Post-mineralisation ;...Effect :Modifies

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.	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