Fact Sheet for Deposit Area 1102

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit Area 1102 - 301
	(Last updated 09.mai.2011)

Name of Deposit Area : Stølsfjell

(Object Id : 1102,301,00,00)

Location

County :

Rogaland (11)

Municipality :

Sandnes (1102)

Map 1:50000:

Høle (1212-1)

Map 1:250000:

Stavanger

Marking point:

Longitude:

5.9769460

Latitude:

58.8483330

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

325593 m.

Y-coord:

6527103 m.

Commodity

Main Type:

Talc

Sub Type:

Talc (Soapstone)

Production

Activity:	Mining	Reserves:
Prod. method:	Open pit and underground mining	Production:
Prod. status:	Disused, closed	Volume of dump:

Importance

Public: Not Assessed (reg. 16.03.2017)

Economical: Could be significant , (Confirmed 08.mar.2001 by Havard Gautneb)

Operations

From - To Activity Comments

1960 - 1965 Regular production Company/Institution :Norwegian Talc

Mineralization

Era: Period:

Dating: Method:

Genesis: Form:

Main texture: Min. distribution:

Main grain size:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Not defined Talc Major mineral (>90%)

Information(s) in free text format

Description

Location The deposit Stølsfjell, also named Nordland, is situated in Høle, some 20 km SE of the city of Stavanger. Description According to Mortenson (1945) the location is in the hills which can be reached by following a 4 km long road from the east end of Tengesdalsvatn. This is a rare type of occurrence for Norway as talc/soapstone here is formed by metasomatism of dolomitic calcite marble. The deposit and its mode of occurrence is described in detail by (Mortensen 1945). According to Dahl (1981) there has here been production during shorter periods covering a time span of several centuries, - more recent ones around 1900 and in the 1930s. All together c. 500 m³ rock has been quarried, most of which has been used as "talc" of various qualities. The talc occurs as pure, pale green and irregularly folded layers, interbedded with layers richer in chlorite or even chlorite and mica. The whole lensoid deposit is surrounded by granites. Remaining talc in the quarry is strongly cracked according to Dahl (1981). According to Mortensen (loc.cit.) minor layers or lenses of serpentine or talc occurs in the marble, but they have always shown to be small and little persistent. Mining has been concentrated basically on these minor accumulations of talc. Bugge (1929) reports up to 60 cm wide bands of light talc within a 5-6 m wide zone of chlorite schist within a 15x15 m cut in the quarry.

Bibliography:

From NGU's Reference Archive:

Mortensen, Odd , 1945

Vannholdige magnesiasilikater dannet ved metasomatose av dolomitiske kalkstener.

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; Olaf Holtedahl på 60-årsdagen 24. juni 1945.; No.25 (1-4);266-284 pages

Abstract:

In the present paper is described a small area consisting mainly of limestones with comparatively high contents of the hydrous silicates of magnesia, viz. serpentine, talc, and tremolite. Besides the presence of these minerals as an integrating part of the carbonate rocks, they also occur as small rock-forming lenses and layers. The mineralogical composition of some samples of the rocks mentioned is given. These rocks constitute the central part of the area.

Bugge, Arne , 1929

Beretning om arbeidet i 5-årsperioden 1924-28. Geologisk kartlegging. Stipendiereiser. Kraftanlegg. Fundamentering. Brønnboring. Befaringer av mineral og ertsforekomster: asbest og talkum ved Faleide. Iakttagelser mellom Lom og Nordfjord. Erts og mi

;Norges geologiske undersøkelse;ÅRSMELDING; TIDSSKRIFTARTIKKEL;NGU; No.133;11-19 pages

	From - To	Activity	Comments
	1960 - 1965	Regular production	Company/Institution :Norwegian Talc

	Era:		Period:
	Dating:		Method:
	Genesis:		Form:
	Main texture:		Min. distribution:

	Province:
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

	Relationship	Mineral	Amount
	Not defined	Talc	Major mineral (>90%)