Norsk versjon
	THE ORE DATABASE
	Deposit Area 621 - 009
	(Last updated 30.sep.2019)

Importance

Public:

Little Importance (reg. 18.02.2015)

Economical:

Minor interest , (Confirmed 16.feb.2005 by Havard Gautneb)

Products

	Element/product	Crude ore grade or quality
	NI	0.6 %

Operations

	From - To	Activity	Comments
	1874 - 1877	Regular production

Mineralization

	Era:	Proterozoic	Period:	Mesoproterozoic
	Dating:		Method:
	Genesis:	Orthomagmatic formation	Form:	Lens
	Main texture:	Structureless	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Mesoproterozoic

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

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Hornblende	Major mineral (>10%)
	Gangue mineral	Plagioclase	Subordinate mineral (1-10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Pentlandite	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Hematite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Metagabbro	Intrusive Original rock :Gabbro
			Metamorphic facies :Amphibolite
	Wall rock	Augen gneiss	Intrusive Original rock :Granite
			Metamorphic facies :Amphibolite

Information(s) in free text format

Free text

The Ramstad Ni-Cu deposit consists of minor mine workings over length of around 1 km in N-S direction, approximately 4 km north of Prestfoss. It was operated in the years 1874-1877, and 1200-1300 t of ore with a total amount of 7 t nickel were produced (Paulsen 1942). The average ore grade was 0.5-0.6 % Ni, and the nickel content in massive sulphide ore was 2.6 % Ni. The mineralizations occur mainly as disseminations of sulphides in well foliated metagabbro. The metagabbro most probably comprises several lenses and boudines enclosed within granitic gneiss, that partly comprises augen gneiss. The metagabbro lenses are a few meter thick and some tens of meter long. The gneiss is transacted by the major fracture breccia zone a few meter east of the gabbroic bodies. The main mine workings comprises a 25 m long and 5-10 m wide, N-S orientated open pit in metagabbro along the western side of a minor valley. The northern wall is up to 8 m high, and it comprises metagabbro with dissemination of pyrrhotite and chalcopyrite (Sample JS_K1706).The volume of the dump material in the south is approximately 250-300 m3, and granitic augen gneiss occurs south of the dump.

Photo(s) from the Deposit area:

Photo no. 1 showing Ramstadfeltet, hovedgruva"

Bibliography:

From NGU's Reference Archive:

Poulsen, A.O. , 1942

	Nikkelforekomster i Sigdal.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 64;7 pages

	Abstract:
	Rapporten beskriver to forekomster kort geologisk og konkluderer med at det bør utføres magnetometriske målinger og geologisk kartlegging for å kunne bedømme eventuelle malmkvanta. Forts. Lok.nr. 10271

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS_K1706	Dump	Sampler :J.S. Sandstad Comment :Po+cpy diss in bands/stringers in foliated metagabbro No. of registrated element analyses = 1
	JS_K1707	Dump	Sampler :J.S. Sandstad Comment :Py+cpy diss/bands in foliated metagabbro No. of registrated element analyses = 1
	JS_K1708	Dump	Sampler :J.S. Sandstad Comment :Massive py bands in metagabbro No. of registrated element analyses = 1

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

Name of Locality : Ramstad S

(Object Id : 0621,009,01,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6355900

Latitude:

60.0788450

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

535366 m.

Y-coord:

6660362 m.

Commodity

	Main Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Sub Type:	Nickel
			Element(s):	Ni Cu

Production

	Activity:	Pitting	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:	30 m3

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Hornblende	Major mineral (>10%)
	Gangue mineral	Plagioclase	Subordinate mineral (1-10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Pentlandite	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Metagabbro	Intrusive Original rock :Gabbro

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :348 / 10	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

A minor trench is located 150 m SSW of the main pit in a lens of strongly foliated metagabbro within granitic gneiss. The length of the walls is 6x2 m, and the high in the north is up to 2 m. Dissemination of pyrrhotite and chalcopyrite occur along the foliation in the metagabbro (Sample JS_K1705).

Photo(s) from the Deposit area:

Photo no. 1 showing Dagbrudd"

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS_K1705	Dump	Sampler :J.S. Sandstad Comment :Po+cpy+py diss in medium grained, foliated metagabbro No. of registrated element analyses = 1

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

Name of Locality : Ramstad 2

(Object Id : 0621,009,02,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6364670

Latitude:

60.0805100

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

535413 m.

Y-coord:

6660547 m.

Commodity

	Main Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Sub Type:	Nickel
			Element(s):	Ni Cu

Production

	Activity:	Pitting	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:	30 m3

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Plagioclase	Major mineral (>10%)
	Gangue mineral	Hornblende	Major mineral (>10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Pentlandite	Subordinate mineral (1-10%)
	Ore mineral	Ilmenite	Accessory mineral (<1%)
	Ore mineral	Hematite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Metagabbro	Intrusive Original rock :Gabbro
			Metamorphic facies :Amphibolite

Information(s) in free text format

Free text

Two minor E-W orientated trenches occur just north of the main Ramstad pit. Granitic gneiss is exposed west of the trenches and the major breccia is located east of their dumps. The northernmost of these trenches is 1-2 m wide, 10 m long and up to 3 m high. The mineralization is dominated by disseminations, lenses and bands of pyrite and minor chalcopyrite in the metagabbro (Samples JS_K1707/08).

Name of Locality : Ramstad N

(Object Id : 0621,009,03,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6372660

Latitude:

60.0837390

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

535454 m.

Y-coord:

6660907 m.

Commodity

	Main Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Sub Type:	Nickel
			Element(s):	Ni Cu

Production

	Activity:	Pitting	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:	210 m3

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Hornblende	Major mineral (>10%)
	Gangue mineral	Epidote	Accessory mineral (<1%)
	Gangue mineral	Chlorite	Accessory mineral (<1%)
	Gangue mineral	Titanite	Accessory mineral (<1%)
	Gangue mineral	Quartz	Accessory mineral (<1%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Pentlandite	Accessory mineral (<1%)
	Ore mineral	Hematite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Metagabbro	Intrusive Original rock :Gabbro
			Metamorphic facies :Amphibolite
	Wall rock	Granitic gneiss	Intrusive Original rock :Granite
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :10 / 25	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Approximately 350 m north of the main Ramstad pit a minor water-filled shaft with length of the walls, 6x5 m is located within a 10-12 m thick lens of metagabbro in the granitic gneiss. Similar, disseminated pyrrhotite-chalcopyrite-pyrite mineralization in metagabbro as in the major pit are found (Sample JS_K1709).

Photo(s) from the Deposit area:

Photo no. 1 showing Ramstad N, Oksåsen" Photo no. 2 showing Ramstad N, Oksåsen"

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS_K1709	Dump	Sampler :J.S. Sandstad Comment :Cpy-po-py diss in foliated metagabbro No. of registrated element analyses = 1

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

Name of Locality : Eivindgruva

(Object Id : 0621,009,04,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6332790

Latitude:

60.0745360

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

535242 m.

Y-coord:

6659880 m.

Commodity

	Main Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Sub Type:	Nickel
			Element(s):	Ni Cu

Production

	Activity:	Pitting	Reserves:
	Prod. method:	Underground mining	Production:
	Prod. status:	Disused, closed	Volume of dump:	10 m3

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Plagioclase	Major mineral (>10%)
	Gangue mineral	Hornblende	Major mineral (>10%)
	Gangue mineral	Chlorite	Accessory mineral (<1%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Pentlandite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Metagabbro	Intrusive Original rock :Gabbro
			Metamorphic facies :Amphibolite
	Wall rock	Granitic augen gneiss	Intrusive Original rock :Granite
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :245 / 65	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

The small Eivind 'mine', is located nearly 700 m SSW of the main Ramstad pit. It consists of a 6x2 m water-filled pit/shaft surrounded by 8-10 m3 of dump material. An 20-40 cm thick sulphide ore with almost massive, fine grained pyrrhotite with aggregates of chalcopyrite in an amphibole rich matrix is exposed (Sample JS_K1704). The metagabbro lens has probable a length of few tens of meter, and medium to coarse grained, granitic augen gneiss (foliation 245°/65°) is exposed just south of the pit. The nickel content in the analysed samples from the Ramstad deposit varies between 0.13-1.10 % Ni with the highest value in the sample from the Eivind mine.

Photo(s) from the Deposit area:

Photo no. 1 showing Eivindgruva" Photo no. 2 showing Eivindgruva, malmstuff"

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS_K1704	Dump	Sampler :J.S. Sandstad Comment :Semi-massive po with cpy aggregates in amphibole matrix No. of registrated element analyses = 1

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

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Analyse Results

from

Deposit Area 621 - 009 Ramstad

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#
JS_K1704	Dump	3580	74	32	717	10950	5.4	12.0
JS_K1705	Dump	3630	68	8	357	4660	1.1	8.0
JS_K1706	Dump	5840	100	11	213	2630	2.4	5.0
JS_K1707	Dump	2700	77	11	347	2700	.9	14.0
JS_K1708	Dump	5960	84	6	802	4240	1.8	17.0
JS_K1709	Dump	19500	88	9	136	1250	6.6	196.0

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

Sample No.	Pt#	Pd#	As*	Fe%	P*	Ti*
JS_K1704	40.0	73.0	-1	25.30	290	3080
JS_K1705	-5.0	98.0	-1	17.80	300	3100
JS_K1706	-5.0	21.0	-1	12.70	350	3770
JS_K1707	-5.0	32.0	3	15.30	390	3730
JS_K1708	173.0	139.0	-1	21.10	340	4040
JS_K1709	15.0	8.0	-1	10.80	390	4310

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The fact sheet was created on 14.05.2024

Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no

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