Fact Sheet for <b>Occurence 5043 - 038 Borvasselva</b>

					Norsk versjon
	THE ORE DATABASE
	Occurence 5043 - 038 Borvasselva
	(Object Id: 279) (Last updated: 18.06.2001)

Drill Cores: Borvasselva

Location

County:

Trøndelag

Municipality:

Raarvihke (5043)

Map 1:50000:

Jomafjellet (1924-1)

Map 1:250000:

Grong

Coordinate system:

EU89-UTM Zone 33

East:

438686 m.

North:

7190243 m.

Longitude:

13.7078870

Latitude:

64.8309830

Show on map

Resource

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

Importance

Raw material meaning:

Not Assessed (reg. 18.02.2015)

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Ag 14 ppm 09.09.1993

Cu 0.6 % 09.09.1993

Pb 0.1 % 09.09.1993

Zn 3.4 % 09.09.1993

Operations

From - To Activity Comments

1970 - 1970 Geophysics

1974 - 1975 Geophysics

1975 - 1975 Geology

1978 - 1978 Pitting

1978 - 1979 Core drilling

1982 - 1983 Geophysics

1982 - 1984 Core drilling

1983 - 1983 Geology

1985 - 1985 Geophysics

1991 - 1991 Sampling

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: Albitisation

Strike/Dip: 360 / 30 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Caledonides

Geotec.unit: Køli Nappe Complex

Tectonic complex: Orklump Nappe

Igneous complex:

Group: Røyrvik Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Carbonate Major mineral (>10%)

Gangue mineral Quartz Subordinate mineral (1-10%)

Gangue mineral Muscovite Subordinate mineral (1-10%)

Gangue mineral Amphibole Subordinate mineral (1-10%)

Gangue mineral Plagioclase Subordinate mineral (1-10%)

Gangue mineral Biotite Accessory mineral (<1%)

Gangue mineral Chlorite Accessory mineral (<1%)

Ore mineral Pyrrhotite Major mineral (>10%)

Ore mineral Pyrite Major mineral (>10%)

Ore mineral Chalcopyrite Subordinate mineral (1-10%)

Ore mineral Sphalerite Subordinate mineral (1-10%)

Ore mineral Arsenopyrite Accessory mineral (<1%)

Ore mineral Cobaltite Accessory mineral (<1%)

Ore mineral Galena Accessory mineral (<1%)

Ore mineral Cubanite Accessory mineral (<1%)

Ore mineral Mackinawite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Wall rock Grønnstein Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Wall rock Fyllitt Sedimentary
Original rock :Argillaceous sediment

Metamorphic facies :Greenschist

Information(s) in free text format

Free text

Beliggenhet. ------------ Nedre del av ei kløft i Borvasselva, ca. 1 km øst for Gåsvann. Forekomsten ble mutet i 1915 av I. Lindmo. Geologi. --------- Feltet ligger i den såkalte Gåsvatn-antiklinalen. Forekomsten opptrer i Røyrvikgruppens grønnsteiner, i samme nivå som Joma-forekomsten og ikke langt fra den overskjøvne Liming-gruppen. Grønnsteinen veksler med Røyrvikgruppens kvartsitter og fyllitter. Disse kan dels være sterkt grafitt-førende, dels være helt uten grafitt. Sammen med grafitt opptrer ofte også små linser av magnetkis. Den massive malmen består av magnetkis og svovelkis, ofte rikelig med kobberkis og lokalt sinkblende og blyglans. Medianverdi for analysene: 0,6 % Cu, 3,4 % Zn, =,1 % Pb, 14 ppm Ag. Malmsonen har en mektighet på 0,2-1 m. I 1983 traff man ved boring en malmkropp på 4-5 m mektighet med 1,12 % Cu, 3,32 %Zn og 56,7 ppm Ag. Dessverre viste dette seg bare å være en "klump" uten interessant utbredelse.

Bibliography:

From NGU's Reference Archive:

Logn, Ø. , 1973

Geologiske, geofysiske og geokjemiske undersøkelser Grongfeltet/Grongprojektet.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.974

Abstract:

Objekt 48: Sandtjern skjerp Objekt 49: Skiftesmyra skjerp Objekt 50: Stordalen-anomaliene

Kihle, Ola , 1976

CP-målinger Skiftesmyr, Rosset "grube" og Borvasselvas skjerp.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1346;18 pages

Singsaas, Per , 1980

Turammålinger Halvvegsvann og Borvasselv

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1710;14 pages

Rønning, Jan Steinar , 1983

Geofysiske målinger ved Borvasselv skjerp

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.2092;26 pages

Abstract:

Rapporten meddeler resultater fra geofysiske målinger på bakken og i borhull ved Borvasselv skjerp sommeren 1983. Videre meddeles resultatene fra laboratoriemålinger av ledningsevne, egenvekt, susceptibilitetm samt resultater fra AMT- og gravimetriske modellberegninger. Hensikten med undersøkelsene var å prøve å kartlegge en kissones forløp i felten. Undersøkelsene har mislyktes i sitt egentlige formål, men det har fremkommet detlajer som fremdeles gjør feltet økonomisk interessant. Det anbefales derfor ytterligere diamantboringer og geofysiske/geologiske undersøkelser.

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).

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

Horbach, R. 1988: Geologisch-petrographische Kartierung und geochemisch-lagerstattenkunliche Untersuchungen am Borvasselv im Bereich der Kieslagerstatte Joma, Mittelnorwegen. Diss. Technische Universitet Clausthal

Fieldsamples

Sample No. Sample type Miscellanrous

LS91109 Bedrock

Sampler: Størseth, L.R.

Comment: Cpy-sl-rik po-malm.

No. of registrated element analyses = 1

LS91110 Bedrock

Sampler: Størseth, L.R.

Comment: Po-diss i foldet klorittskifer.

No. of registrated element analyses = 1

LS91111 Bedrock

Sampler: Størseth, L.R.

Comment: Ordinær po-malm.

No. of registrated element analyses = 1

LS91112 Bedrock

Sampler: Størseth, L.R.

Comment: Cpy-sl-min. i kvartsåre.

No. of registrated element analyses = 1

1009 Bedrock

No. of registrated element analyses = 1

1010 Bedrock

No. of registrated element analyses = 1

1012 Bedrock

No. of registrated element analyses = 1

1013 Bedrock

No. of registrated element analyses = 1

1014 Bedrock

No. of registrated element analyses = 1

1015 Bedrock

No. of registrated element analyses = 1

1024 Bedrock

No. of registrated element analyses = 1

1025 Bedrock

No. of registrated element analyses = 1

1026 Bedrock

No. of registrated element analyses = 1

1027 Bedrock

No. of registrated element analyses = 1

1028 Bedrock

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 5043 - 038 Borvasselva

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#

LS91109 Bedrock 8049 27630 686 166 120 16.9 44.0

LS91110 Bedrock 3042 4348 26 50 70 4.1 4.0

LS91111 Bedrock 9524 25072 728 207 119 18.3 47.0

LS91112 Bedrock 11968 11589 127 13 16 22.2 14.0

1009 Bedrock 677 31338 1080 156 181 7.3 30.0

1010 Bedrock 523 34590 965 334 198 10.2 33.0

1012 Bedrock 12203 12714 338 213 151 32.9 39.0

1013 Bedrock 99999 18821 887 54 26 258.9 35.0

1014 Bedrock 99999 27830 533 63 33 282.0 715.0

1015 Bedrock 18494 7475 68 47 26 19.4 1855.0

1024 Bedrock 3131 19031 630 215 121 12.6 45.0

1025 Bedrock 1522 9768 83 17 14 3.2 20.0

1026 Bedrock 1624 17555 802 216 116 10.6 32.0

1027 Bedrock 32904 25101 547 165 87 41.5 36.0

1028 Bedrock 1538 22035 711 238 133 10.5 93.0

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

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

LS91109 1.0 1.0 2 141.1 7 10.00 2 10 18.55

LS91110 1.0 1.0 2 25.4 19 1.00 9 4 5.64

LS91111 2.0 5.0 5 131.9 3 8.00 2 10 27.44

LS91112 1.0 3.0 6 74.4 1 7.00 2 7 2.84

1009 1.0 2.0 13 202.1 2 14.00 7 16 26.32

1010 1.0 3.0 12 217.1 3 8.00 9 12 30.61

1012 1.0 3.0 6 73.1 3 4.00 4 12 31.55

1013 1.0 2.0 12 135.5 2 6.00 9 25 26.41

1014 1.0 3.0 15 190.0 2 6.00 5 28 26.80

1015 5.0 20.0 11 52.2 1 1.00 2 2 5.30

1024 3.0 3.0 11 114.6 2 5.00 5 4 26.71

1025 4.0 4.0 10 62.8 2 1.00 2 2 1.70

1026 2.0 4.0 16 107.7 3 7.00 7 9 23.54

1027 1.0 2.0 19 161.4 2 7.00 2 16 19.01

1028 1.0 6.0 8 137.0 3 6.00 4 7 27.77

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

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

LS91109 30 94 320 25.19 1.00 5.00 1 21.0 2.00

LS91110 25 42 436 8.29 1.00 5.00 1 49.0 2.00

LS91111 13 65 257 34.12 1.00 5.00 1 48.0 2.00

LS91112 1 19 68 5.56 1.00 5.00 6 2.0 2.00

1009 5 8 98 31.09 3.00 5.00 1 5.0 2.00

1010 8 10 125 31.07 3.00 5.00 3 1.0 2.00

1012 1 4 65 42.16 4.00 5.00 4 1.0 2.00

1013 4 13 177 20.53 2.00 5.00 2 23.0 2.00

1014 10 18 178 21.06 2.00 5.00 2 17.0 2.00

1015 3 10 508 7.23 1.00 5.00 1 66.0 2.00

1024 6 9 128 39.58 4.00 5.00 2 24.0 2.00

1025 7 9 271 13.59 2.00 5.00 1 26.0 2.00

1026 17 28 228 34.29 4.00 5.00 1 27.0 2.00

1027 7 15 115 20.43 3.00 5.00 2 7.0 2.00

1028 8 12 72 35.61 4.00 5.00 2 1.0 2.00

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

Sample No. B*

LS91109 5

LS91110 3

LS91111 6

LS91112 4

1009 3

1010 2

1012 2

1013 2

1014 2

1015 6

1024 2

1025 2

1026 2

1027 2

1028 2

Element/product	Crude ore grade or quality	Reg. date
Ag	14 ppm	09.09.1993
Cu	0.6 %	09.09.1993
Pb	0.1 %	09.09.1993
Zn	3.4 %	09.09.1993

From - To	Activity	Comments
1970 - 1970	Geophysics
1974 - 1975	Geophysics
1975 - 1975	Geology
1978 - 1978	Pitting
1978 - 1979	Core drilling
1982 - 1983	Geophysics
1982 - 1984	Core drilling
1983 - 1983	Geology
1985 - 1985	Geophysics
1991 - 1991	Sampling

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

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

Relationship	Mineral	Amount
Gangue mineral	Carbonate	Major mineral (>10%)
Gangue mineral	Quartz	Subordinate mineral (1-10%)
Gangue mineral	Muscovite	Subordinate mineral (1-10%)
Gangue mineral	Amphibole	Subordinate mineral (1-10%)
Gangue mineral	Plagioclase	Subordinate mineral (1-10%)
Gangue mineral	Biotite	Accessory mineral (<1%)
Gangue mineral	Chlorite	Accessory mineral (<1%)
Ore mineral	Pyrrhotite	Major mineral (>10%)
Ore mineral	Pyrite	Major mineral (>10%)
Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
Ore mineral	Sphalerite	Subordinate mineral (1-10%)
Ore mineral	Arsenopyrite	Accessory mineral (<1%)
Ore mineral	Cobaltite	Accessory mineral (<1%)
Ore mineral	Galena	Accessory mineral (<1%)
Ore mineral	Cubanite	Accessory mineral (<1%)
Ore mineral	Mackinawite	Accessory mineral (<1%)

Relationship	Rock	Origin
Wall rock	Grønnstein	Extrusive Original rock :Basalt
		Metamorphic facies :Greenschist
Wall rock	Fyllitt	Sedimentary Original rock :Argillaceous sediment
		Metamorphic facies :Greenschist

	Abstract:
	Objekt 48: Sandtjern skjerp Objekt 49: Skiftesmyra skjerp Objekt 50: Stordalen-anomaliene

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
LS91109	Bedrock	8049	27630	686	166	120	16.9	44.0
LS91110	Bedrock	3042	4348	26	50	70	4.1	4.0
LS91111	Bedrock	9524	25072	728	207	119	18.3	47.0
LS91112	Bedrock	11968	11589	127	13	16	22.2	14.0
1009	Bedrock	677	31338	1080	156	181	7.3	30.0
1010	Bedrock	523	34590	965	334	198	10.2	33.0
1012	Bedrock	12203	12714	338	213	151	32.9	39.0
1013	Bedrock	99999	18821	887	54	26	258.9	35.0
1014	Bedrock	99999	27830	533	63	33	282.0	715.0
1015	Bedrock	18494	7475	68	47	26	19.4	1855.0
1024	Bedrock	3131	19031	630	215	121	12.6	45.0
1025	Bedrock	1522	9768	83	17	14	3.2	20.0
1026	Bedrock	1624	17555	802	216	116	10.6	32.0
1027	Bedrock	32904	25101	547	165	87	41.5	36.0
1028	Bedrock	1538	22035	711	238	133	10.5	93.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
LS91109	1.0	1.0	2	141.1	7	10.00	2	10	18.55
LS91110	1.0	1.0	2	25.4	19	1.00	9	4	5.64
LS91111	2.0	5.0	5	131.9	3	8.00	2	10	27.44
LS91112	1.0	3.0	6	74.4	1	7.00	2	7	2.84
1009	1.0	2.0	13	202.1	2	14.00	7	16	26.32
1010	1.0	3.0	12	217.1	3	8.00	9	12	30.61
1012	1.0	3.0	6	73.1	3	4.00	4	12	31.55
1013	1.0	2.0	12	135.5	2	6.00	9	25	26.41
1014	1.0	3.0	15	190.0	2	6.00	5	28	26.80
1015	5.0	20.0	11	52.2	1	1.00	2	2	5.30
1024	3.0	3.0	11	114.6	2	5.00	5	4	26.71
1025	4.0	4.0	10	62.8	2	1.00	2	2	1.70
1026	2.0	4.0	16	107.7	3	7.00	7	9	23.54
1027	1.0	2.0	19	161.4	2	7.00	2	16	19.01
1028	1.0	6.0	8	137.0	3	6.00	4	7	27.77

Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
LS91109	30	94	320	25.19	1.00	5.00	1	21.0	2.00
LS91110	25	42	436	8.29	1.00	5.00	1	49.0	2.00
LS91111	13	65	257	34.12	1.00	5.00	1	48.0	2.00
LS91112	1	19	68	5.56	1.00	5.00	6	2.0	2.00
1009	5	8	98	31.09	3.00	5.00	1	5.0	2.00
1010	8	10	125	31.07	3.00	5.00	3	1.0	2.00
1012	1	4	65	42.16	4.00	5.00	4	1.0	2.00
1013	4	13	177	20.53	2.00	5.00	2	23.0	2.00
1014	10	18	178	21.06	2.00	5.00	2	17.0	2.00
1015	3	10	508	7.23	1.00	5.00	1	66.0	2.00
1024	6	9	128	39.58	4.00	5.00	2	24.0	2.00
1025	7	9	271	13.59	2.00	5.00	1	26.0	2.00
1026	17	28	228	34.29	4.00	5.00	1	27.0	2.00
1027	7	15	115	20.43	3.00	5.00	2	7.0	2.00
1028	8	12	72	35.61	4.00	5.00	2	1.0	2.00