Fact Sheet for <b>Occurence 5031

					Norsk versjon
	THE ORE DATABASE
	Occurence 5031 - 005 Lauvsgruva
	(Object Id: 4474) (Last updated: 05.07.2023)

Location

County:

Trøndelag

Municipality:

Malvik (5031)

Map 1:50000:

Stjørdal (1621-1)

Map 1:250000:

Trondheim

Coordinate system:

EU89-UTM Zone 32

East:

593113 m.

North:

7022555 m.

Longitude:

10.8588350

Latitude:

63.3196570

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Resource

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

Importance

Raw material meaning:

Not Assessed (reg. 18.02.2015)

Resources and production

	Activity:	Test mining	Reserves:
	Operating method:	Open pit mining	Historical production:

Mineralization

Era: Paleozoic Period: Ordovician

Genesis: Volcex Form: Layer

Main texture: Structureless Min. distribution: Massive (>50 % ore minerals)

Main grain size: Fine grained (< 1 mm) Main alteration: Chloritisation

Strike/Dip: 45 / 75 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Caledonides

Geotec.unit: Trondheim Nappe Complex

Tectonic complex:

Igneous complex:

Group: Støren Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Ore mineral Pyrite Major mineral (>10%)

Lithology:

Relationship Rock Origin

Wall rock Greenschist Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Structures

Location: Type: Orientation(360 gr.): Relation to min.:

Wall rock Foliation Strike/Dip :85 / 80 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Flere mindre skjæringer og skjerp ligger langs Lauva i en sidedal sørover fra Lauvdalen. En bomvei kan følges fra Selbuveien og ca. 1,5 km innover Lauvdalen. Lengst i nord og vest for elva er det en 5 m lang, 2-3 m bred og opptil 5 m høy dagskjæring med retning 215°. Lengst sør i skjæringen er det synlig en minst 1 m mektig sulfidsone med svært finkornet pyritt; vasskis. Denne har strøk 45° og steilt fall mot SØ. I tillegg finnes det en tilsvarende 30 cm mektig vasskis-sone med enkelte kvartslinser sentralt i skjæringen. Mellom disse sulfidsonene opptrer en 1,5 m mektig grønnskifer. Forekomsten inneholder kun svært små mengder kobber og sink.

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

HK90-012 Bedrock

Sampler: Karlstrøm, H.

Comment: Massiv fink. po med noe rekryst. py.

No. of registrated element analyses = 1

HK90-013 Bedrock

Sampler: Karlstrøm, H.

Comment: Grafittrik mikrokryst. py-matriks med "stringer" av rekr. py.

No. of registrated element analyses = 1

HK90-014 Bedrock

Sampler: Karlstrøm, H.

Comment: Finkornet po og py med ba.-fragm. Spor av cpy.

No. of registrated element analyses = 1

HK90-015S Bedrock

Sampler: Karlstrøm, H.

Comment: Samleprøve

No. of registrated element analyses = 1

Lauvsgruva-1 Bedrock

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

Comment: Massive pyrite, fine-/medium-grained, quartz-matrix

No. of registrated element analyses = 1

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

Name of Locality: Lauvsgruva 3

(Object Id: 38640 5,01,00)

Location

County: Trøndelag Municipality: Malvik (5031)

Map 1:50000: Stjørdal (1621-1) Map 1:250000: Trondheim

Coordinate system: EU89-UTM Zone 32

East: 593127 m. North: 7022548 m.

Longitude: 10.8590910 Latitude: 63.3195990

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Resource

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

Element(s): Kis

Resources and production

Activity: Pitting Reserves:

Operating method: Open pit mining Historical production:

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Ore mineral Pyrrhotite Major mineral (>10%)

Ore mineral Pyrite Major mineral (>10%)

Ore mineral Magnetite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Wall rock Greenschist Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Structures

Location: Type: Orientation(360 gr.): Relation to min.:

Wall rock Fold axis Dir./Plunge :95 / 45 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

På østsida av sidedalen er det en 25-30 m lang dagskjæring som i stor grad er gjenfylt. Både en 10 cm mektig sone med pyritt og magnetitt og en 20-30 cm mektig sone med finkornet, massiv pyritt og magnetkis kan observeres. Det er mulig disse opptrer i en foldeombøyning. En prøve av blokk med massiv magnetkis-pyritt breksjemalm ble prøvetatt.

Fieldsamples

Sample No. Sample type Miscellanrous

Lauvsgruva-4 Dump

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

Comment: Pyrrhotite+pyrite breccia, very fine-grained matrix

No. of registrated element analyses = 1

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

Name of Locality: Lauvsgruva 2

(Object Id: 39132 5,03,00)

Location

County: Trøndelag Municipality: Malvik (5031)

Map 1:50000: Hemne (1421-1) Map 1:250000: Trondheim

Coordinate system: EU89-UTM Zone 32

East: 593140 m. North: 7022542 m.

Longitude: 10.8593660 Latitude: 63.3195330

Show on map

Resource

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

Element(s): Kis

Resources and production

Activity: Pitting Reserves:

Operating method: Open pit mining Historical production:

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Ore mineral Pyrrhotite Major mineral (>10%)

Ore mineral Pyrite Subordinate mineral (1-10%)

Fieldsamples

Sample No. Sample type Miscellanrous

Lauvsgruva-2 Dump

Sampler: T.Bjerkgård/...Stored: Løkken/...Size(kg): 2

Comment: Massive, fine-grained pyrrhotite with mm-grained pyrite

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 5031 - 005 Lauvsgruva

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#

HK90-012 Bedrock 195 308 7 7 30 .3 13.0

HK90-013 Bedrock 223 811 27 5 61 .5 150.0

HK90-014 Bedrock 214 933 32 10 61 .7 74.0

HK90-015S Bedrock 196 640 22 7 46 .4 53.0

Lauvsgruva-1 Bedrock 141 206 23 26 69 .4 46.0

Lauvsgruva-2 Dump 241 997 14 17 79 .6 18.0

Lauvsgruva-3 Dump 254 77 8 18 101 .2 19.0

Lauvsgruva-4 Dump 98 544 31 12 66 1.2 366.0

------------------

Sample No. Pt# Pd# As* Cd* Ba* Mo* Sn* Sb* Bi*

HK90-012 1.0 3.0 74 2.0 2 3.00 2 2

HK90-013 6.0 9.0 264 2.4 1 1.00 33 2

HK90-014 3.0 12.0 232 1.8 4 1.00 11 2

HK90-015S 2.0 6.0 307 2.7 2 1.00 12 2

Lauvsgruva-1 -5.0 6.0 185 .4 40 12.35 0 5 0

Lauvsgruva-2 5.0 3.0 151 2.8 90 36.50 1 1 0

Lauvsgruva-3 -5.0 2.0 36 .2 100 99.20 0 1 0

Lauvsgruva-4 5.0 2.0 899 1.4 50 66.60 1 83 1

------------------

Sample No. Se* Ga* Ge* In* S% V* Cr* Mn* Fe%

HK90-012 29.90 25 13 199 27.37

HK90-013 29.10 22 25 179 24.13

HK90-014 35.50 7 8 141 36.23

HK90-015S 33.80 24 21 229 26.94

Lauvsgruva-1 3.00 6.11 0.16 0.03 10.00 82 66 521 30.60

Lauvsgruva-2 4.00 4.46 0.18 0.04 10.00 72 22 233 46.10

Lauvsgruva-3 5.00 6.47 0.16 0.01 10.00 66 36 274 33.70

Lauvsgruva-4 3.00 4.19 0.15 0.04 10.00 73 65 239 34.50

------------------

Sample No. Th* U* W* Rb* Sr* Y* Zr* Nb* Ta*

HK90-012 4.00 5.00 1 38.0

HK90-013 4.00 5.00 1 12.0

HK90-014 5.00 5.00 2 2.0

HK90-015S 4.00 5.00 1 33.0

Lauvsgruva-1 1.58 4.20 0 4.3 8.2 9.4 25 1.80 0.13

Lauvsgruva-2 1.72 4.70 0 9.2 5.7 6.6 21 1.80 0.13

Lauvsgruva-3 2.20 11.30 0 9.1 24.2 8.0 27 2.50 0.17

Lauvsgruva-4 1.50 7.00 1 8.6 43.6 7.8 26 2.30 0.14

------------------

Sample No. Cs* La* Ce* B* Li* Be* Na* Mg* Al*

HK90-012 4.00 2

HK90-013 6.00 2

HK90-014 2.00 2

HK90-015S 4.00 2

Lauvsgruva-1 0.20 4.70 10.95 13 0 1000 16300 20400

Lauvsgruva-2 0.35 5.00 10.15 5 0 300 5000 11600

Lauvsgruva-3 0.32 4.10 9.15 7 0 300 7300 16300

Lauvsgruva-4 0.19 4.40 9.61 5 0 5100 3700 16500

------------------

Sample No. P* K * Ca* Sc* Ti* Te* Hf* Re* Tl*

HK90-012

HK90-013

HK90-014

HK90-015S

Lauvsgruva-1 360 2300 2100 7.20 1190 0.20 0.60 0 0

Lauvsgruva-2 100 4100 1200 3.30 670 -0.05 0.50 0 1

Lauvsgruva-3 330 4800 2700 5.00 1080 0.10 0.70 0 1

Lauvsgruva-4 270 4000 6000 5.00 1260 0.11 0.70 0 2

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

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

Relationship	Mineral	Amount
Gangue mineral	Quartz	Major mineral (>10%)
Ore mineral	Pyrite	Major mineral (>10%)

Relationship	Rock	Origin
Wall rock	Greenschist	Extrusive Original rock :Basalt
		Metamorphic facies :Greenschist

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :85 / 80	Post-mineralisation ;...Effect :Modifies

	Activity:	Pitting	Reserves:
	Operating method:	Open pit mining	Historical production:

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
HK90-012	Bedrock	195	308	7	7	30	.3	13.0
HK90-013	Bedrock	223	811	27	5	61	.5	150.0
HK90-014	Bedrock	214	933	32	10	61	.7	74.0
HK90-015S	Bedrock	196	640	22	7	46	.4	53.0
Lauvsgruva-1	Bedrock	141	206	23	26	69	.4	46.0
Lauvsgruva-2	Dump	241	997	14	17	79	.6	18.0
Lauvsgruva-3	Dump	254	77	8	18	101	.2	19.0
Lauvsgruva-4	Dump	98	544	31	12	66	1.2	366.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
HK90-012	1.0	3.0	74	2.0	2	3.00		2	2
HK90-013	6.0	9.0	264	2.4	1	1.00		33	2
HK90-014	3.0	12.0	232	1.8	4	1.00		11	2
HK90-015S	2.0	6.0	307	2.7	2	1.00		12	2
Lauvsgruva-1	-5.0	6.0	185	.4	40	12.35	0	5	0
Lauvsgruva-2	5.0	3.0	151	2.8	90	36.50	1	1	0
Lauvsgruva-3	-5.0	2.0	36	.2	100	99.20	0	1	0
Lauvsgruva-4	5.0	2.0	899	1.4	50	66.60	1	83	1

Sample No.	Se*	Ga*	Ge*	In*	S%	V*	Cr*	Mn*	Fe%
HK90-012					29.90	25	13	199	27.37
HK90-013					29.10	22	25	179	24.13
HK90-014					35.50	7	8	141	36.23
HK90-015S					33.80	24	21	229	26.94
Lauvsgruva-1	3.00	6.11	0.16	0.03	10.00	82	66	521	30.60
Lauvsgruva-2	4.00	4.46	0.18	0.04	10.00	72	22	233	46.10
Lauvsgruva-3	5.00	6.47	0.16	0.01	10.00	66	36	274	33.70
Lauvsgruva-4	3.00	4.19	0.15	0.04	10.00	73	65	239	34.50