Fact Sheet for <b>Occurence 4201

					Norsk versjon
	THE ORE DATABASE
	Occurence 4201 - 005 Ekorndalen
	(Object Id: 5279) (Last updated: 18.06.2001)

Location

County:

Agder

Municipality:

Risør (4201)

Map 1:50000:

Tvedestrand (1612-2)

Map 1:250000:

Arendal

Coordinate system:

EU89-UTM Zone 32

East:

503440 m.

North:

6511650 m.

Longitude:

9.0594370

Latitude:

58.7449130

Show on map

Resource

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

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Test mining	Reserves:
	Operating method:	Underground mining	Historical production:

Operations

From - To Activity Comments

1901 - 1913 Test mining

2000 - 2000 Sampling Company/Institution :NGU

Mineralization

Era: Proterozoic Period: Mesoproterozoic

Genesis: Hydrothermal vein Form: Lens

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

Main grain size: Fine grained (< 1 mm) Main alteration: No country rock alteration

Strike/Dip: 206 / 80 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Proterozoic Period: Mesoproterozoic

Province: South Norwegian Basement Province

Geotec.unit: Bamble Complex

Tectonic complex:

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Feldspar Major mineral (>10%)

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Biotite Accessory mineral (<1%)

Ore mineral Pyrite Major mineral (>10%)

Ore mineral Chalcopyrite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Host rock Biotite gneis Sedimentary

Metamorphic facies :Amphibolite

Wall rock Quartzite Sedimentary
Original rock :Quartz sandstone

Metamorphic facies :Amphibolite

Structures

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

Host rock Schistosity Strike/Dip :200 / 75 Syn-mineralisation ;...Effect :Modifies

Host rock Foliation Strike/Dip :210 / 80 Syn-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

Forekomsten ligger ca. 20 m fra vannkanten ved nordvestenden av Vormlitjenna og nåes best fra en skytebane i nordenden av vannet. Den består av en 33 m lang stoll med retning 208° fra åpningen. Etter 23 m svinger stollen mer i vestlig retning. Forekomsten ble oppdaget før 1880 og mindre forsøksdrift ble utført i 1901 og 1913. Stollen følger en svakt sulfidmineralisert, kvarts-feltspat pegmatittgang som ligger i biotittgneis med foliasjon 210°/80°. Pyritt og små mengder kobberkis utgjør sulfidene. Gangen er opptil 1.4 m bred med retning 206°/80° og kan følges sammenhengende i ca. 12 meters lengde innover. Videre innover sees spredte kvartslinser. Ved åpningen domineres gangen av grønnlig feltspat og stedvis sees mindre mengder biotitt. Sørøst for åpningen opptrer grovkornet kvartsitt i ligg av biotittgneissen mens middelskornet gabbro finnes i knauser 25 m nordøst for åpningen.

Photo(s) from the Deposit area:

Photo no. 1 showing Stollinngangen i Ekorndalen"

Bibliography:

From NGU's Reference Archive:

Fieldsamples

Sample No. Sample type Miscellanrous

AA0107.01 Bedrock

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

Comment: Svak disseminasjon av finkornet pyritt og kobberkis i grovkornet kvarts-feltspat+biotitt gang.

No. of registrated element analyses = 1

AA0107.02 Bedrock

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

Comment: Svak disseminasjon og sprekkefyllinger av pyritt og kopperkis kvartsgang.

No. of registrated element analyses = 1

AA0107.03 Bedrock

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

Comment: Disseminasjon av pyritt langs biotitt-hornblende bånd og i omgivende kvartsitt.

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 4201 - 005 Ekorndalen

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#

AA0107.01 Bedrock 44 20 3 7 11 .2 1.0

AA0107.02 Bedrock 1039 16 4 21 21 .2 9.0

AA0107.03 Bedrock 408 13 6 34 24 .2 3.0

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

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

AA0107.01 1.0 1.0 2 .1 149 3.00 2 2 .04

AA0107.02 1.0 4.0 2 .1 77 4.00 2 2 .35

AA0107.03 1.0 4.0 3 .1 85 3.00 2 2 .60

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

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

AA0107.01 13 77 96 1.58 1.00 4.00 1 28.0 6.00

AA0107.02 4 109 59 1.50 1.00 4.00 2 70.0 3.00

AA0107.03 17 95 130 2.34 5.00 4.00 1 16.0 36.00

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

Sample No. B*

AA0107.01 3

AA0107.02 8

AA0107.03 3

From - To	Activity	Comments
1901 - 1913	Test mining
2000 - 2000	Sampling	Company/Institution :NGU

Era:	Proterozoic	Period:	Mesoproterozoic
Genesis:	Hydrothermal vein	Form:	Lens
Main texture:	Structureless	Min. distribution:	Disseminated (<20 % ore minerals)

	Province:	South Norwegian Basement Province
	Geotec.unit:	Bamble Complex
	Tectonic complex:
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Feldspar	Major mineral (>10%)
Gangue mineral	Quartz	Major mineral (>10%)
Gangue mineral	Biotite	Accessory mineral (<1%)
Ore mineral	Pyrite	Major mineral (>10%)
Ore mineral	Chalcopyrite	Accessory mineral (<1%)

Relationship	Rock	Origin
Host rock	Biotite gneis	Sedimentary
		Metamorphic facies :Amphibolite
Wall rock	Quartzite	Sedimentary Original rock :Quartz sandstone
		Metamorphic facies :Amphibolite

Location:	Type:	Orientation(360 gr.):	Relation to min.:
Host rock	Schistosity	Strike/Dip :200 / 75	Syn-mineralisation ;...Effect :Modifies
Host rock	Foliation	Strike/Dip :210 / 80	Syn-mineralisation ;...Effect :Controls

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
AA0107.01	Bedrock	44	20	3	7	11	.2	1.0
AA0107.02	Bedrock	1039	16	4	21	21	.2	9.0
AA0107.03	Bedrock	408	13	6	34	24	.2	3.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
AA0107.01	1.0	1.0	2	.1	149	3.00	2	2	.04
AA0107.02	1.0	4.0	2	.1	77	4.00	2	2	.35
AA0107.03	1.0	4.0	3	.1	85	3.00	2	2	.60

Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
AA0107.01	13	77	96	1.58	1.00	4.00	1	28.0	6.00
AA0107.02	4	109	59	1.50	1.00	4.00	2	70.0	3.00
AA0107.03	17	95	130	2.34	5.00	4.00	1	16.0	36.00