Fact Sheet for <b>Occurence 5043 - 025 Halvveisberget</b>

					Norsk versjon
	THE ORE DATABASE
	Occurence 5043 - 025 Halvveisberget
	(Object Id: 263) (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:

421882 m.

North:

7193388 m.

Longitude:

13.3521780

Latitude:

64.8556930

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Resource

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

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

1911 - 1911 Pitting

1991 - 1991 Sampling Company/Institution :NGU

1996 - 1996 Inspection Company/Institution :NGU

Mineralization

Era: Paleozoic Period: Ordovician

Genesis: Volcex Form: Layer

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

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

Strike/Dip: 40 / 80 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Caledonides

Geotec.unit: Køli Nappe Complex

Tectonic complex: Gjersvikdekket

Igneous complex:

Group: Gjersvikgruppen Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Chlorite Subordinate mineral (1-10%)

Ore mineral Magnetite Major mineral (>10%)

Ore mineral Pyrite Major mineral (>10%)

Lithology:

Relationship Rock Origin

Wall rock Grønnstein Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Structures

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

Host rock Mineral banding Strike/Dip :30 / 80 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Det ligger en rekke skjerp i ekshalitthorisonter mellom Bjørkvatnet og Gjersvika. De viktigste er beskrevet her. Hovedskjerpet ligger i en forsenkning 200 m sørsørvest for det høyeste punktet på hovedveien. Bjørkvatnet SØ ligger i munningen av Bjørkvatnet og er lett å finne. Storfossen ligger i selve fossen rett nordvest for et sandtak. Forekomsten ble oppdaget i 1911 av Peder Gjersvik og Ole Haabnes, og ble "litt minert" samme år. I dette området finnes en rekke ekshalitthorisonter som består dels av massiv svovelkis (vasskis), massiv magnetitt og magnetitt- og sulfidførende chert/kvartsitt (blåkvarts). De er normalt 0.5-2 m mektige og kan vanligvis følges få titalls meter langs strøket, men kan ha en utstrekning på få hundre meter. Disse jernformasjonene ligger i grønnstein, og i området finnes en rekke felsiske intrusive og ekstrusive bergarter. Det er ikke mulig å avgjøre om ekshalittene tilhører nøyaktig det samme stratigrafiske nivået. I hovedskjerpet opptrer få dm mektige lag i veksling som består av ren svovelkis, svovelkisdisseminasjon i klorittrik bergart, svovelkisdisseminasjon i chert og ren magnetitt. Ganger med hydrotermal kvarts skjærer disse lagene. Forekomsten i munningen av Bjørkvatnet har en noe mer uregelmessig form som gir et komplekst stratigrafisk forhold mellom kis og blåkvarts. Massiv kis herfra er dessuten noe anriket på gull. Storfossenforekomsten er relativt flattliggende og inneholder lite kis. Den består hovedsakelig av massive magnetitt med enkelte chertlinser og er opptil 1.5 m mektig. Forøvrig finnes en rekke magnetitthorisonter 0.2-0.5 m mektige i dette området.

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).

Fieldsamples

Sample No. Sample type Miscellanrous

HK90-208 Bedrock

Sampler: Karlstrøm, H.

Comment: Grovkornet py som bånd og impr. i gr.sk.

No. of registrated element analyses = 1

HK90-209 Bedrock

Sampler: Karlstrøm, H.

Comment: Massiv, fink. py med små korn av mt.

No. of registrated element analyses = 1

HK90-210 Bedrock

Sampler: Karlstrøm, H.

Comment: Mt-båndet, massiv, fink. py-min.

No. of registrated element analyses = 1

HK90-211S Bedrock

Sampler: Karlstrøm, H.

Comment: Samleprøve

No. of registrated element analyses = 1

JS93129 Dump

Sampler: Sandstad, J.S./...Stored: Løkken

Comment: massive pyrite - diss. py in chert - diss. py chlorite-rich rock.

No. of registrated element analyses = 1

LS91104 Bedrock

Sampler: Størseth, L.R.

Comment: Båndet grov-finkrystallin py.

No. of registrated element analyses = 1

LS91105 Bedrock

Sampler: Størseth, L.R.

Comment: Mt-båndet vasskis.

No. of registrated element analyses = 1

NT0301.01 Dump

Sampler: Sandstad, J.S./...Stored: løkken

Comment: pyrite ore, massive, fine grained, partly banded

No. of registrated element analyses = 1

NT0301.02 Dump

Sampler: Sandstad, J.S./...Stored: Løkken

Comment: pyrite diss. in magnetite-chlorite-chert exhalite

No. of registrated element analyses = 1

NT0301.03 Dump

Sampler: Sandstad, J.S./...Stored: Løkken

Comment: magnetite, massiv, very fine grained, chert lenses

No. of registrated element analyses = 1

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

Name of Sample point: Halvveisberget vest

(Object Id: 6936 25,00,01)

Location

County: Trøndelag Municipality: Raarvihke (5043)

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

Coordinate system: EU89-UTM Zone 33

East: 421722 m. North: 7193298 m.

Longitude: 13.3488540 Latitude: 64.8548480

Show on map

Resource

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

Element(s): Kis Fe

Fieldsamples

Sample No. Sample type Miscellanrous

LS91092 Bedrock

Sampler: Størseth, L.R.

Comment: Massiv kis.

No. of registrated element analyses = 1

LS91093 Bedrock

Sampler: Størseth, L.R.

Comment: Py-åre i grønnstein.

No. of registrated element analyses = 1

NT0301.04 Bedrock

Sampler: Sandstad, J.S./...Stored: Løkken

Comment: magnetite, massive, fine grained

No. of registrated element analyses = 1

NT0301.05 Bedrock

Sampler: Sandstad, J.S./...Stored: Løkken

Comment: pyrite ore, massive, fine grained, quartz rich matrix

No. of registrated element analyses = 1

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

Name of Sample point: Prøvepunkt 2

(Object Id: 626 25,00,02)

Location

County: Trøndelag Municipality: Raarvihke (5043)

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

Coordinate system: EU89-UTM Zone 33

East: 422632 m. North: 7193723 m.

Longitude: 13.3678080 Latitude: 64.8588720

Show on map

Resource

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

Element(s): Kis Fe

Fieldsamples

Sample No. Sample type Miscellanrous

LS91133 Bedrock

Sampler: Størseth, L.R.

Comment: Py-dissemin. i omv. grønnstein.

No. of registrated element analyses = 1

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

Name of Locality: Bjørkvatnet SØ

(Object Id: 481 25,01,00)

Location

County: Trøndelag Municipality: Raarvihke (5043)

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

Coordinate system: EU89-UTM Zone 33

East: 421032 m. North: 7192758 m.

Longitude: 13.3346070 Latitude: 64.8498420

Show on map

Resource

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

Element(s): Kis Fe

Resources and production

Activity: Pitting Reserves:

Operating method: Historical production:

Fieldsamples

Sample No. Sample type Miscellanrous

LS91089 Bedrock

Sampler: Størseth, L.R.

Comment: Vasskis.

No. of registrated element analyses = 1

LS91090 Bedrock

Sampler: Størseth, L.R.

Comment: Vasskis-kvarts.

No. of registrated element analyses = 1

LS91091 Bedrock

Sampler: Størseth, L.R.

Comment: Grovk. py i tilknytning til kvartsåre.

No. of registrated element analyses = 1

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

Name of Locality: Storfossen

(Object Id: 482 25,02,00)

Location

County: Trøndelag Municipality: Raarvihke (5043)

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

Coordinate system: EU89-UTM Zone 33

East: 422742 m. North: 7192498 m.

Longitude: 13.3707930 Latitude: 64.8479100

Show on map

Resource

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

Element(s): Kis Fe

Resources and production

Activity: Pitting Reserves:

Operating method: Historical production:

Fieldsamples

Sample No. Sample type Miscellanrous

JS96028 Bedrock

Sampler: Sandstad, J.S./...Stored: Løkken

Comment: BIF, massive magnetite, chert lenses, py diss.

No. of registrated element analyses = 1

LS91079 Bedrock

Sampler: Størseth, L.R.

Comment: Py-diss. i mt-bånd.

No. of registrated element analyses = 1

LS91080 Bedrock

Sampler: Størseth, L.R.

Comment: Fattig py-diss. i omv. grønnstein.

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 5043 - 025 Halvveisberget

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#

HK90-208 Bedrock 70 193 9 13 25 .2 16.0

HK90-209 Bedrock 47 94 13 3 17 .6 104.0

HK90-210 Bedrock 377 1266 55 7 26 1.2 61.0

HK90-211S Bedrock 121 182 13 6 22 .5 61.0

JS93129 Dump 44 128 16 17 37 .6 46.0

JS96028 Bedrock 51 158 -3 9 43 -.3 2.0

LS91079 Bedrock 44 79 5 4 21 .3 8.0

LS91080 Bedrock 34 46 3 3 10 .3 15.0

LS91089 Bedrock 52 69 5 165 195 .4 90.0

LS91090 Bedrock 101 21 2 106 51 .3 32.0

LS91091 Bedrock 137 14 2 59 41 1.0 34.0

LS91092 Bedrock 99 125 41 9 28 .5 374.0

LS91093 Bedrock 77 415 2 5 19 .3 41.0

LS91104 Bedrock 61 171 16 15 30 .2 27.0

LS91105 Bedrock 72 139 18 12 38 .4 48.0

LS91133 Bedrock 32 10 4 27 81 .2 3.0

NT0301.01 Dump 42 108 22 6 23 .5 86.0

NT0301.02 Dump 67 236 15 18 34 -.3 10.0

NT0301.03 Dump 7 175 -3 5 25 -.3 2.0

NT0301.04 Bedrock 24 216 16 3 15 -.3 4.0

NT0301.05 Bedrock 109 171 55 6 34 .4 176.0

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

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

HK90-208 2.0 7.0 60 1.9 4 2.00 2

HK90-209 3.0 6.0 36 1.2 6 1.00 6

HK90-210 5.0 6.0 33 4.5 5 1.00 2

HK90-211S 3.0 5.0 43 1.3 7 2.00 3

JS93129 6.0 4.0 55 -1.0 5 23.00 -20 -5

JS96028 4.0 5.0 -1.0 -2 1.7 5 -1.00 2

LS91079 6.0 3.0 6 1.8 10 1.00 2

LS91080 3.0 2.0 21 .2 9 1.00 2

LS91089 5.0 4.0 48 .2 8 18.00 4

LS91090 3.0 1.0 3 .2 10 37.00 4

LS91091 3.0 2.0 3 .2 3 2.00 2

LS91092 4.0 5.0 226 .2 4 2.00 5

LS91093 6.0 2.0 93 1.0 3 6.00 2

LS91104 5.0 6.0 43 .3 3 5.00 2

LS91105 4.0 5.0 25 .2 4 4.00 2

LS91133 1.0 1.0 3 .2 23 3.00 2

NT0301.01 3.0 4.0 -1.0 31 -.2 8 -1.00 -2

NT0301.02 5.0 7.0 4.0 52 .8 5 1.00 8

NT0301.03 1.0 1.0 -1.0 4 .6 6 1.00 6

NT0301.04 2.0 2.0 -1.0 2 -.2 3 1.00 6

NT0301.05 4.0 6.0 -1.0 244 -.2 6 1.00 -2

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

Sample No. Bi* S% V* Cr* Mn* Fe% Th* U* W*

HK90-208 2 19.18 133 33 1166 27.38 4.00 5.00 1

HK90-209 2 30.69 36 10 284 23.71 3.00 5.00 1

HK90-210 5 30.18 102 13 419 32.66 5.00 5.00 1

HK90-211S 3 28.71 92 19 575 29.11 4.00 5.00 1

JS93129 13 28.50 74 214 570 9.99 -20

JS96028 -2 .06 140 37 3868 26.48 10.00 -5.00 -2

LS91079 2 3.79 128 14 1579 28.52 1.00 5.00 1

LS91080 2 1.11 24 9 931 7.34 1.00 5.00 1

LS91089 9 18.31 18 23 721 25.50 1.00 5.00 1

LS91090 7 7.28 27 18 184 20.70 1.00 5.00 1

LS91091 6 7.87 25 12 130 22.62 1.00 5.00 1

LS91092 4 32.50 72 8 310 25.84 1.00 5.00 3

LS91093 2 14.10 89 18 2165 23.78 1.00 5.00 1

LS91104 2 18.31 108 33 1062 27.23 3.00 5.00 1

LS91105 3 28.10 96 18 693 29.86 2.00 5.00 1

LS91133 2 3.32 65 162 418 4.65 1.00 5.00 1

NT0301.01 -2 40.50 45 8 292 19.08 -2.00 -5.00 -2

NT0301.02 -2 12.83 209 48 1388 24.93 -2.00 -5.00 -2

NT0301.03 -2 .26 209 38 1161 22.67 -2.00 -5.00 -2

NT0301.04 4 .21 223 42 647 27.30 -2.00 -5.00 -2

NT0301.05 3 37.24 99 14 296 19.35 -2.00 -5.00 -2

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

Sample No. Sr* Y* La* B* Te*

HK90-208 15.0 16.00 2

HK90-209 2.0 2.00 2

HK90-210 3.0 2.00 2

HK90-211S 5.0 6.00 2

JS93129 4.0 6.0 -1.00 -10.00

JS96028 15.0 17.00 -3

LS91079 17.0 8.00 2

LS91080 6.0 2.00 3

LS91089 3.0 2.00 5

LS91090 1.0 2.00 5

LS91091 1.0 2.00 3

LS91092 3.0 2.00 3

LS91093 4.0 2.00 2

LS91104 10.0 10.00 2

LS91105 3.0 2.00 2

LS91133 3.0 2.00 2

NT0301.01 4.0 -1.00 5

NT0301.02 20.0 16.00 -3

NT0301.03 13.0 18.00 5

NT0301.04 8.0 10.00 -3

NT0301.05 3.0 1.00 3

From - To	Activity	Comments
1911 - 1911	Pitting
1991 - 1991	Sampling	Company/Institution :NGU
1996 - 1996	Inspection	Company/Institution :NGU

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

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

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

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

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Mineral banding	Strike/Dip :30 / 80	Post-mineralisation ;...Effect :Modifies

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
HK90-208	Bedrock	70	193	9	13	25	.2	16.0
HK90-209	Bedrock	47	94	13	3	17	.6	104.0
HK90-210	Bedrock	377	1266	55	7	26	1.2	61.0
HK90-211S	Bedrock	121	182	13	6	22	.5	61.0
JS93129	Dump	44	128	16	17	37	.6	46.0
JS96028	Bedrock	51	158	-3	9	43	-.3	2.0
LS91079	Bedrock	44	79	5	4	21	.3	8.0
LS91080	Bedrock	34	46	3	3	10	.3	15.0
LS91089	Bedrock	52	69	5	165	195	.4	90.0
LS91090	Bedrock	101	21	2	106	51	.3	32.0
LS91091	Bedrock	137	14	2	59	41	1.0	34.0
LS91092	Bedrock	99	125	41	9	28	.5	374.0
LS91093	Bedrock	77	415	2	5	19	.3	41.0
LS91104	Bedrock	61	171	16	15	30	.2	27.0
LS91105	Bedrock	72	139	18	12	38	.4	48.0
LS91133	Bedrock	32	10	4	27	81	.2	3.0
NT0301.01	Dump	42	108	22	6	23	.5	86.0
NT0301.02	Dump	67	236	15	18	34	-.3	10.0
NT0301.03	Dump	7	175	-3	5	25	-.3	2.0
NT0301.04	Bedrock	24	216	16	3	15	-.3	4.0
NT0301.05	Bedrock	109	171	55	6	34	.4	176.0

Sample No.	Pt#	Pd#	Rh#	As*	Cd*	Ba*	Mo*	Sn*	Sb*
HK90-208	2.0	7.0		60	1.9	4	2.00		2
HK90-209	3.0	6.0		36	1.2	6	1.00		6
HK90-210	5.0	6.0		33	4.5	5	1.00		2
HK90-211S	3.0	5.0		43	1.3	7	2.00		3
JS93129	6.0	4.0		55	-1.0	5	23.00	-20	-5
JS96028	4.0	5.0	-1.0	-2	1.7	5	-1.00		2
LS91079	6.0	3.0		6	1.8	10	1.00		2
LS91080	3.0	2.0		21	.2	9	1.00		2
LS91089	5.0	4.0		48	.2	8	18.00		4
LS91090	3.0	1.0		3	.2	10	37.00		4
LS91091	3.0	2.0		3	.2	3	2.00		2
LS91092	4.0	5.0		226	.2	4	2.00		5
LS91093	6.0	2.0		93	1.0	3	6.00		2
LS91104	5.0	6.0		43	.3	3	5.00		2
LS91105	4.0	5.0		25	.2	4	4.00		2
LS91133	1.0	1.0		3	.2	23	3.00		2
NT0301.01	3.0	4.0	-1.0	31	-.2	8	-1.00		-2
NT0301.02	5.0	7.0	4.0	52	.8	5	1.00		8
NT0301.03	1.0	1.0	-1.0	4	.6	6	1.00		6
NT0301.04	2.0	2.0	-1.0	2	-.2	3	1.00		6
NT0301.05	4.0	6.0	-1.0	244	-.2	6	1.00		-2

Sample No.	Bi*	S%	V*	Cr*	Mn*	Fe%	Th*	U*	W*
HK90-208	2	19.18	133	33	1166	27.38	4.00	5.00	1
HK90-209	2	30.69	36	10	284	23.71	3.00	5.00	1
HK90-210	5	30.18	102	13	419	32.66	5.00	5.00	1
HK90-211S	3	28.71	92	19	575	29.11	4.00	5.00	1
JS93129	13	28.50	74	214	570	9.99			-20
JS96028	-2	.06	140	37	3868	26.48	10.00	-5.00	-2
LS91079	2	3.79	128	14	1579	28.52	1.00	5.00	1
LS91080	2	1.11	24	9	931	7.34	1.00	5.00	1
LS91089	9	18.31	18	23	721	25.50	1.00	5.00	1
LS91090	7	7.28	27	18	184	20.70	1.00	5.00	1
LS91091	6	7.87	25	12	130	22.62	1.00	5.00	1
LS91092	4	32.50	72	8	310	25.84	1.00	5.00	3
LS91093	2	14.10	89	18	2165	23.78	1.00	5.00	1
LS91104	2	18.31	108	33	1062	27.23	3.00	5.00	1
LS91105	3	28.10	96	18	693	29.86	2.00	5.00	1
LS91133	2	3.32	65	162	418	4.65	1.00	5.00	1
NT0301.01	-2	40.50	45	8	292	19.08	-2.00	-5.00	-2
NT0301.02	-2	12.83	209	48	1388	24.93	-2.00	-5.00	-2
NT0301.03	-2	.26	209	38	1161	22.67	-2.00	-5.00	-2
NT0301.04	4	.21	223	42	647	27.30	-2.00	-5.00	-2
NT0301.05	3	37.24	99	14	296	19.35	-2.00	-5.00	-2