Fact Sheet for <b>Occurence 5043 - 002 Selbekkskjerpene</b>

					Norsk versjon
	THE ORE DATABASE
	Occurence 5043 - 002 Selbekkskjerpene
	(Object Id: 228) (Last updated: 16.05.2006)

Location

County:

Trøndelag

Municipality:

Raarvihke (5043)

Map 1:50000:

Røyrvik (1924-4)

Map 1:250000:

Grong

Coordinate system:

EU89-UTM Zone 33

East:

421612 m.

North:

7192008 m.

Longitude:

13.3472450

Latitude:

64.8432520

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:

Operations

From - To Activity Comments

1969 - 1969 Geophysics Company/Institution :NGU

1969 - 1969 Geochemistry Company/Institution :NGU

1969 - 1969 Geology Company/Institution :NGU

1990 - 1991 Sampling Company/Institution :NGU

1993 - 1993 Geology Company/Institution :NGU

Mineralization

Era: Paleozoic Period: Ordovician

Genesis: Volcex Form: Irregular

Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)

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

Strike/Dip: 125 / 30 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Caledonides

Geotec.unit: Køli Nappe Complex

Tectonic complex: Gjersvik Nappe

Igneous complex: Skorovass Complex

Group: Gjersvik Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Chlorite Subordinate mineral (1-10%)

Ore mineral Pyrite Major mineral (>10%)

Ore mineral Magnetite Major mineral (>10%)

Lithology:

Relationship Rock Origin

Wall rock Greenstone Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Structures

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

Wall rock Foliation Strike/Dip :125 / 25 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Mineraliseringen ligger i en liten bekk ca. 500 m sør for elva fra Bjørkvatnet, og ca. 500 m fra dennes utløp fra vannet, i sørkant av myrdrag ved kote 520. Fire små skjerp langs den samme sonen over en lengde på 250 m er registrert av Grongprosjektet i 1969 (Logn 1971). Mineraliseringen er en båndet jernformasjon som består av vekslende oksid- og sulfidfacies. Massiv, finkornet magnetitt i lag som er mindre enn 1 m mektig med varierende mengder disseminert pyritt, dels pyritt i striper, dominerer. I forekomstlokaliteten finnes også en få dm-mektig semi-massiv pyritt sone. Varierende mengde disseminert pyritt finnes også i omvandlet, bleket grønnstein langs denne sonen. Magnetittførende chert, blåkvarts, er også observert. Jernformasjonen ligger tektonostratigrafisk under mørk, Fe-Ti rik grønnstein og over lys grønnstein. Jernformasjonen opptrer trolig på samme stratigrafiske nivå som andre jernformasjoner øst og nord for Bjørkvatnet. Porfyriske ganger som er tilknyttet en større granodioritt på Sæterlifjellet i sør gjennomskjærer jernformasjon.

Bibliography:

From NGU's Reference Archive:

Oftedahl, Christoffer , 1958

Oversikt over Grongfeltets skjerp og malmforekomster.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.202;1-75 + fo pages

Abstract:

Ore occurences of the Grong area: In the period 1910-1918 a great number of ore occurences were discovered in the Grong area. The late state geologist Steinar Foslie mapped the area in the years 1922-1931. Foslie also mapped all claims and occurences and made special field investigations in a few cases. This book presents a survey of all occurences chiefly based on the field observations of Foslie. In addition the present author has done some field work in connection with the three large deposits, Joma, Skorovass, and Gjersvik. The map, Plate 1, shows the areal geology and the location of the occurrences, numbered from 1 to 131. the ore of the occurrences is chiefly pyrite. The larger occurrences also contain some chalcopyrite and sphalerite etc. and the smaller occurrences contain ither pure pyrite with some magnetite. The Joma deposit (No. 1), contains about 15.5 mill. tons of ore. The ore zone forms an arc and is situated within a thick series of greenstones (Fig. 1). The Skorovass mine (No. 2), contains about 7,5 mill. tons of ore. The deposit is situated in a greenstone complex (Fig. 7), and is immediately surrounded by asid tuffs of quartz keratophyric composition (Table 1).

Logn, Ø. , 1971

Geologiske, geofysiske og geokjemiske undersøkelser Grongfeltet/Grongprosjektet.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.905;12 pages

Abstract:

Under oppdrag 905 ble det utført undersøkelser på en rekke objekter. Det vises til NGU Rapport nr. 84.091: Statusrapport for geofysikk utført i Nord-Trøndelag fylke (1984).

Fieldsamples

Sample No. Sample type Miscellanrous

HK90-222 Bedrock

Sampler: Karlstrøm, H.

Comment: Massive magnetite with few pyrite grains and pyrite along fractures.

No. of registrated element analyses = 1

HK90-223 Bedrock

Sampler: Karlstrøm, H.

Comment: Strong pyrite disseminations in strongly silicified greenstone with transition to thin pyrite bands in less altered greenstone.

No. of registrated element analyses = 1

HK90-224 Bedrock

Sampler: Karlstrøm, H.

Comment: Strong pyrite dissemination in fine graind quartzitic rock (silicified greenstone?).

No. of registrated element analyses = 1

HK90-225S Bedrock

Sampler: Karlstrøm, H.

Comment: Chip sample.

No. of registrated element analyses = 1

LS91075 Bedrock

Sampler: Størseth, L.R.

Comment: Fine grained massive pyrite ore with magnetite crystals.

No. of registrated element analyses = 1

LS91076 Bedrock

Sampler: Størseth, L.R.

Comment: Semi-massive, pyrite ore with greenstone.

No. of registrated element analyses = 1

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

Name of Locality: Skjerp 1

(Object Id: 539 2,01,00)

Location

County: Trøndelag Municipality: Raarvihke (5043)

Map 1:50000: Røyrvik (1924-4) Map 1:250000: Grong

Coordinate system: EU89-UTM Zone 33

East: 421512 m. North: 7192048 m.

Longitude: 13.3451150 Latitude: 64.8435870

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: Historical production:

Operations

From - To Activity Comments

1991 - 1991 Sampling Company/Institution :NGU

1993 - 1993 Geology Company/Institution :NGU

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Chlorite Subordinate mineral (1-10%)

Ore mineral Pyrite Major mineral (>10%)

Ore mineral Magnetite Major mineral (>10%)

Lithology:

Relationship Rock Origin

Wall rock Calcareous greenstone Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Wall rock Dark greenstone Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Structures

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

Host rock Mineral banding Strike/Dip :120 / 20 Syn-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

Ved en mindre bekkefoss ligger et lite skjerp. Tektonostratigrafisk øverst finnes mørk, jern-titan rik grønnstein. Den ligger over en 40-50 cm mektig sone med finkornet, massiv svovelkis som fører få cm brede magnetitt bånd nederst. Jernformasjonen ligger over en lys, kalkrik grønnstein.

Fieldsamples

Sample No. Sample type Miscellanrous

LS91072 Bedrock

Sampler: Størseth, L.R.

Comment: Coarse grained, semi-massive pyrite in greenstone.

No. of registrated element analyses = 1

LS91073 Bedrock

Sampler: Størseth, L.R.

Comment: Fine grained pyrite dissemination in greenstone.

No. of registrated element analyses = 1

LS91074 Bedrock

Sampler: Størseth, L.R.

Comment: Pyrite mineralization with magnetite band.

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 5043 - 002 Selbekkskjerpene

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#

HK90-222 Bedrock 69 90 6 1 8 .1 3.0

HK90-223 Bedrock 48 135 5 7 30 .2 14.0

HK90-224 Bedrock 30 114 6 8 33 .2 13.0

HK90-225S Bedrock 55 142 5 6 19 .2 9.0

LS91072 Bedrock 119 113 11 7 33 .2 11.0

LS91073 Bedrock 17 128 5 8 34 .4 10.0

LS91074 Bedrock 117 67 13 6 16 .2 2.0

LS91075 Bedrock 26 201 2 12 32 .6 171.0

LS91076 Bedrock 81 598 2 12 36 .4 57.0

LS91077 Bedrock 94 253 13 10 35 1.0 80.0

LS91078 Bedrock 210 294 2 5 72 1.4 45.0

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

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

HK90-222 1.0 5.0 9 .6 19 1.00 2 2 .94

HK90-223 1.0 2.0 77 .4 14 6.00 2 2 9.66

HK90-224 2.0 2.0 109 .4 16 6.00 3 2 10.42

HK90-225S 1.0 3.0 60 .6 24 5.00 4 2 10.14

LS91072 5.0 2.0 97 1.5 12 2.00 2 2 31.30

LS91073 4.0 3.0 96 .2 24 7.00 2 2 8.07

LS91074 6.0 5.0 20 .2 7 1.00 2 2 1.97

LS91075 6.0 4.0 162 .2 9 4.00 2 2 26.63

LS91076 4.0 4.0 254 5.7 7 14.00 2 2 17.35

LS91077 4.0 4.0 170 .2 7 1.00 2 2 28.03

LS91078 8.0 1.0 266 .2 7 6.00 3 2 18.92

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

Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*

HK90-222 67 39 520 30.69 4.00 5.00 1 16.0 10.00

HK90-223 20 8 579 15.66 3.00 5.00 1 3.0 2.00

HK90-224 17 10 505 12.95 3.00 5.00 1 3.0 3.00

HK90-225S 40 25 705 24.80 3.00 5.00 1 8.0 5.00

LS91072 34 18 580 24.79 1.00 5.00 1 14.0 3.00

LS91073 30 16 723 12.16 1.00 5.00 1 4.0 3.00

LS91074 139 62 539 39.53 2.00 5.00 1 18.0 10.00

LS91075 57 16 1664 27.61 1.00 5.00 1 5.0 2.00

LS91076 72 19 2244 31.39 1.00 5.00 1 4.0 2.00

LS91077 36 8 1807 25.31 1.00 5.00 1 2.0 2.00

LS91078 45 11 2341 27.98 1.00 5.00 1 2.0 2.00

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

Sample No. B*

HK90-222 2

HK90-223 2

HK90-224 2

HK90-225S 2

LS91072 2

LS91073 2

LS91074 2

LS91075 4

LS91076 2

LS91077 3

LS91078 3

From - To	Activity	Comments
1969 - 1969	Geophysics	Company/Institution :NGU
1969 - 1969	Geochemistry	Company/Institution :NGU
1969 - 1969	Geology	Company/Institution :NGU
1990 - 1991	Sampling	Company/Institution :NGU
1993 - 1993	Geology	Company/Institution :NGU

Era:	Paleozoic	Period:	Ordovician
Genesis:	Volcex	Form:	Irregular
Main texture:	Banded	Min. distribution:	Semi-massive (20-50 % ore minerals)

	Province:	Caledonides
	Geotec.unit:	Køli Nappe Complex
	Tectonic complex:	Gjersvik Nappe
	Igneous complex:	Skorovass Complex

Relationship	Mineral	Amount
Gangue mineral	Quartz	Major mineral (>10%)
Gangue mineral	Chlorite	Subordinate mineral (1-10%)
Ore mineral	Pyrite	Major mineral (>10%)
Ore mineral	Magnetite	Major mineral (>10%)

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

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :125 / 25	Post-mineralisation ;...Effect :Modifies

	Abstract:
	Under oppdrag 905 ble det utført undersøkelser på en rekke objekter. Det vises til NGU Rapport nr. 84.091: Statusrapport for geofysikk utført i Nord-Trøndelag fylke (1984).

	Activity:	Exploration	Reserves:
	Operating method:		Historical production:

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
HK90-222	Bedrock	69	90	6	1	8	.1	3.0
HK90-223	Bedrock	48	135	5	7	30	.2	14.0
HK90-224	Bedrock	30	114	6	8	33	.2	13.0
HK90-225S	Bedrock	55	142	5	6	19	.2	9.0
LS91072	Bedrock	119	113	11	7	33	.2	11.0
LS91073	Bedrock	17	128	5	8	34	.4	10.0
LS91074	Bedrock	117	67	13	6	16	.2	2.0
LS91075	Bedrock	26	201	2	12	32	.6	171.0
LS91076	Bedrock	81	598	2	12	36	.4	57.0
LS91077	Bedrock	94	253	13	10	35	1.0	80.0
LS91078	Bedrock	210	294	2	5	72	1.4	45.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
HK90-222	1.0	5.0	9	.6	19	1.00	2	2	.94
HK90-223	1.0	2.0	77	.4	14	6.00	2	2	9.66
HK90-224	2.0	2.0	109	.4	16	6.00	3	2	10.42
HK90-225S	1.0	3.0	60	.6	24	5.00	4	2	10.14
LS91072	5.0	2.0	97	1.5	12	2.00	2	2	31.30
LS91073	4.0	3.0	96	.2	24	7.00	2	2	8.07
LS91074	6.0	5.0	20	.2	7	1.00	2	2	1.97
LS91075	6.0	4.0	162	.2	9	4.00	2	2	26.63
LS91076	4.0	4.0	254	5.7	7	14.00	2	2	17.35
LS91077	4.0	4.0	170	.2	7	1.00	2	2	28.03
LS91078	8.0	1.0	266	.2	7	6.00	3	2	18.92

Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
HK90-222	67	39	520	30.69	4.00	5.00	1	16.0	10.00
HK90-223	20	8	579	15.66	3.00	5.00	1	3.0	2.00
HK90-224	17	10	505	12.95	3.00	5.00	1	3.0	3.00
HK90-225S	40	25	705	24.80	3.00	5.00	1	8.0	5.00
LS91072	34	18	580	24.79	1.00	5.00	1	14.0	3.00
LS91073	30	16	723	12.16	1.00	5.00	1	4.0	3.00
LS91074	139	62	539	39.53	2.00	5.00	1	18.0	10.00
LS91075	57	16	1664	27.61	1.00	5.00	1	5.0	2.00
LS91076	72	19	2244	31.39	1.00	5.00	1	4.0	2.00
LS91077	36	8	1807	25.31	1.00	5.00	1	2.0	2.00
LS91078	45	11	2341	27.98	1.00	5.00	1	2.0	2.00