Fact Sheet for <b>Occurence 5025

					Norsk versjon
	THE ORE DATABASE
	Occurence 5025 - 043 Fruhaugen
	(Object Id: 4375) (Last updated: 27.10.2023)

Location

County:

Trøndelag

Municipality:

Rosse (5025)

Map 1:50000:

Røros (1720-3)

Map 1:250000:

Røros

Coordinate system:

EU89-UTM Zone 32

East:

617792 m.

North:

6939471 m.

Longitude:

11.2920080

Latitude:

62.5672960

Show on map

Resource

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

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Cu 16.04.1998

Kis 16.04.1998

Zn 16.04.1998

Operations

From - To Activity Comments

Pitting

1997 - 1997 Sampling Company/Institution :NGU

Mineralization

Era: Paleozoic Period: Ordovician

Genesis: Hydrothermal vein Form: Irregular

Main texture: Vein network Min. distribution: Disseminated (<20 % ore minerals)

Main grain size: Medium grained (1-3 mm) Main alteration: Sericitisation

Strike/Dip: 60 / 20 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Caledonides

Geotec.unit: Røros Nappe Complex

Tectonic complex:

Igneous complex:

Group: Aursund Group Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Sericite Major mineral (>10%)

Ore mineral Pyrite Major mineral (>10%)

Ore mineral Chalcopyrite Subordinate mineral (1-10%)

Ore mineral Sphalerite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Wall rock Amphibole-chlorite schist Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Structures

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

Wall rock Foliation Strike/Dip :60 / 20 Post-mineralisation ;...Effect :Controls

Information(s) in free text format

Description

Fruhaugen-forekomsten består av tre grunne røskegrøfter i myrlendt terreng oppe på en kolle. Røskene ligger tilnærmet langs strøket (retning 30-35 grader) med avstand 20-30 meter fra hverandre. Den sørligste røsken er 8 x 2 m og 0.5 m dyp, den neste 10 x 2 m og ca. 2 m dyp (vannfylt) og den nordligste 9 x 2 m og 0.5 m dyp. Det er svært lite tippmateriale. I følge Braastad (1920) skal det nordligste skjerpet ha vært drevet som en synk i 1907-1908 og ha en betydelig tipphaug. Strøk blir oppgitt til NØ-SV med fall ca. 30 grader mot vest og med en betydelig mektighet. Mineralisering ble kun observert i noen få prøver på tipphaugen og ser ut til å består av mm til cm-tykke bånd med impregnasjon og semimassiv pyritt med mindre mengder sinkblende og kobberkis i kvarts-sericittskifer. Mektigheten på den mineraliserte sonen er antakelig rundt 1 meter (dårlig blottet og vannfylt røsk).

Bibliography:

References not to be found in NGU's Reference Archive.:

Johan Braastad 1920: Beskrivelse av Rørosgruberne. 56 pp. Norges Geologisk Undersøkelse 1920.

Fieldsamples

Sample No. Sample type Miscellanrous

Fruhaugen-1 Dump

Sampler: T. Bjerkgård

No. of registrated element analyses = 1

ST0172.01 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 1

Comment: Impregnation and semimassive < 1 cm bands of pyrite in mm grains in quartz-sericite schist

No. of registrated element analyses = 1

ST0172.02 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 1

Comment: Rich impregnation of pyrite and sphalerite in bands, and aggregates of chalcopyrite in quartz-sericite schist.

No. of registrated element analyses = 1

399711 Dump

Sampler: MINDEX ASA

No. of registrated element analyses = 1

399712 Dump

Sampler: MINDEX ASA

No. of registrated element analyses = 1

399713 Dump

Sampler: MINDEX ASA

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 5025 - 043 Fruhaugen

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#

Fruhaugen-1 Dump 5590 45800 154 71 22 6.3 142.0

ST0172.01 Dump 5252 8293 56 122 23 3.8 135.0

ST0172.02 Dump 3557 99999 157 97 9 .5 192.0

399711 Dump 1633 46000 139 30 34 1.4 47.0

399712 Dump 12000 71000 121 103 24 5.7 347.0

399713 Dump 1824 8266 89 74 44 2.3 107.0

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

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

Fruhaugen-1 2.5 1.0 105 93.9 40 2.26 37 1 12

ST0172.01 1.0 2.0 77 21.2 14 1.00 -3 22

ST0172.02 1.0 1.0 80 299.9 15 8.00 -3 54

399711 289 82.4 29 8.00 3 36

399712 449 166.9 15 5.00 3 27

399713 163 20.0 14 22.00 3 18

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

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

Fruhaugen-1 20.00 12.30 0.19 15.75 10.00 19 33 88 27.60

ST0172.01 14.00 4 5 73 13.15

ST0172.02 22.40 6 7 143 18.02

399711 25 428 331 5.17

399712 10 276 224 9.60

399713 7 366 182 20.50

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

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

Fruhaugen-1 0.81 0.30 1 21.3 3.9 1.1 17 2.10 0.15

ST0172.01 4.00 -8.00 5 1.0

ST0172.02 6.00 -8.00 -2 1.0

399711 3.0

399712 3.0

399713 3.0

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

Sample No. Cs* La* Ce* B* Li* Be* Sc* Ti* Te*

Fruhaugen-1 0.49 1.00 2.16 4 0 2.40 570 1.79

ST0172.01 -1.00 11

ST0172.02 -1.00 -3

399711 2.00 60

399712 0.50 30

399713 0.50 30

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

Sample No. Hf* Re* Tl*

Fruhaugen-1 0.50 0 3

ST0172.01

ST0172.02

399711

399712

399713

Element/product	Crude ore grade or quality	Reg. date
Cu		16.04.1998
Kis		16.04.1998
Zn		16.04.1998

From - To	Activity	Comments
	Pitting
1997 - 1997	Sampling	Company/Institution :NGU

Era:	Paleozoic	Period:	Ordovician
Genesis:	Hydrothermal vein	Form:	Irregular
Main texture:	Vein network	Min. distribution:	Disseminated (<20 % ore minerals)

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

Relationship	Mineral	Amount
Gangue mineral	Quartz	Major mineral (>10%)
Gangue mineral	Sericite	Major mineral (>10%)
Ore mineral	Pyrite	Major mineral (>10%)
Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
Ore mineral	Sphalerite	Subordinate mineral (1-10%)

Relationship	Rock	Origin
Wall rock	Amphibole-chlorite schist	Extrusive Original rock :Basalt
		Metamorphic facies :Greenschist

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :60 / 20	Post-mineralisation ;...Effect :Controls

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
Fruhaugen-1	Dump	5590	45800	154	71	22	6.3	142.0
ST0172.01	Dump	5252	8293	56	122	23	3.8	135.0
ST0172.02	Dump	3557	99999	157	97	9	.5	192.0
399711	Dump	1633	46000	139	30	34	1.4	47.0
399712	Dump	12000	71000	121	103	24	5.7	347.0
399713	Dump	1824	8266	89	74	44	2.3	107.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
Fruhaugen-1	2.5	1.0	105	93.9	40	2.26	37	1	12
ST0172.01	1.0	2.0	77	21.2	14	1.00		-3	22
ST0172.02	1.0	1.0	80	299.9	15	8.00		-3	54
399711			289	82.4	29	8.00		3	36
399712			449	166.9	15	5.00		3	27
399713			163	20.0	14	22.00		3	18

Sample No.	Se*	Ga*	Ge*	In*	S%	V*	Cr*	Mn*	Fe%
Fruhaugen-1	20.00	12.30	0.19	15.75	10.00	19	33	88	27.60
ST0172.01					14.00	4	5	73	13.15
ST0172.02					22.40	6	7	143	18.02
399711						25	428	331	5.17
399712						10	276	224	9.60
399713						7	366	182	20.50

Sample No.	Th*	U*	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*
Fruhaugen-1	0.81	0.30	1	21.3	3.9	1.1	17	2.10	0.15
ST0172.01	4.00	-8.00	5		1.0
ST0172.02	6.00	-8.00	-2		1.0
399711					3.0
399712					3.0
399713					3.0

Sample No.	Cs*	La*	Ce*	B*	Li*	Be*	Sc*	Ti*	Te*
Fruhaugen-1	0.49	1.00	2.16		4	0	2.40	570	1.79
ST0172.01		-1.00		11
ST0172.02		-1.00		-3
399711		2.00						60
399712		0.50						30
399713		0.50						30