Norsk versjon
THE NATURAL STONE DATABASE
Deposit Area 301 - 617
(Last updated 16.feb.2010)

Name of Deposit Area : Ravnkollen 1
(Object Id : 0301,617,00,00)

Location
County : Oslo (03) Municipality : Oslo (0301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Marking point: Longitude: 10.8867640 Latitude: 59.9653140
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-coord: 605339 m. Y-coord: 6649050 m.

Commodity
Main Type: Granite and other igneous rocks Sub Type: Syenite
Brickstone(Y/N): N
Production
Activity: Stone quarrying Reserves:
Prod. method: Open pit mining Production:
Prod. status: Disused, closed Volume of dump:

Importance
Public: Little Importance (reg. 18.02.2015)
Economical: Minor interest , (Confirmed 29.sep.2004 by Leif Furuhaug)
Historical: Yes , (Confirmed 29.sep.2004 by Leif Furuhaug)

Deposit rock
Lithology: Weathering colour:
Era: Period:
Dating: Method:
Genesis: Form:
Main texture:
Main grain size: Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Period:
Province:
Geotec.unit:
Tectonic complex:
Igneous complex:
Group: Formation:

Information(s) in free text format
Description
Det er brutt ut stein over et større område på platået på toppen av Ravnkollen. Total lengde er 220 m. Det er brutt stein på omtrent hele denne strekningen, men avsenkningen er stort sett mindre enn 1 m. På et mindre område på 10 m x 10 m er det gått lenger ned, avsenkningen er her 3 m.
Location
Flere mindre brudd på toppen av Ravnekollen.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddområde"

Bibliography:
From NGU's Reference Archive:
Oxaal, John , 1916
Norsk granit
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.76;1-220 pages
Abstract:
This work is a report of granite and the granite industry in Norway. It contains a description of the various fields of granite and similar rocks from a scientific as well as from a technical and economical standpoint. The geological occurrence of the various rocks, their chemical and mineralogical composition, are thoruoughlyoughly treated, also the questions of practical interest, as the quality and other technical properties, further the problems of location and conditions for transport, conditions for quarrying and otherquestions of interest in the utilization of the various occurrences of granite. Granite: This chapter consideres first the mineralogical and chemical composition of the granite, and the various types of granite resulting from the varying composition; thereafter the most important structural types and how these are dependent on the geological appearance of the rock. Lakkolites and other froms assumed by granite masses when injected into the crust of the earth, are mentioned; some examples of beautifully formed lakkolites are also mentioned. The question of sheet structure and rift in the granite are of great importance in its utilization, and are of interest both practically and theoretically.

Name of Locality : Ravnkollen 2
(Object Id : 0301,617,01,00)

Location
County : Oslo (03) Municipality : Oslo (0301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Marking point: Longitude: 10.8868520 Latitude: 59.9636960
EU89-UTM Zone 32
X-coord: 605350 m. Y-coord: 6648870 m.

Commodity
Main Type: Granite and other igneous rocks Sub Type: Syenite
Brickstone(Y/N):
Production
Activity: Stone quarrying Reserves:
Prod. method: Open pit mining Production:
Prod. status: Disused, closed Volume of dump:

Importance
Historical: Yes , (Confirmed 09.feb.2010 by Leif Furuhaug)

Information(s) in free text format
Description
Størrelsen på det opprinnelige bruddet er umulig å anslå da det i dag er begravd av rasmasse. Det er fremdeles stor rasfare nær inntil bebyggelse her. Bruddet var drevet til ca. 1960, de siste årene som pukkverk.
Location
Bruddet ligger i nordøstre ende av bebyggelsen på Ammerud rett under en stupbratt fjellside fra Ravnekollen.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddet"

Name of Locality : Ravnkollen 3
(Object Id : 0301,617,02,00)

Location
County : Oslo (03) Municipality : Oslo (0301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Marking point: Longitude: 10.8880350 Latitude: 59.9627720
EU89-UTM Zone 32
X-coord: 605418 m. Y-coord: 6648769 m.

Commodity
Main Type: Granite and other igneous rocks Sub Type: Syenite
Brickstone(Y/N):
Production
Activity: Stone quarrying Reserves:
Prod. method: Open pit mining Production:
Prod. status: Disused, closed Volume of dump:

Importance
Historical: Yes , (Confirmed 09.feb.2010 by Leif Furuhaug)

Information(s) in free text format
Description
Det er her brutt på en groruditt-gang. Bergarten er i sammensetning en granitt, men ser helt annerledes ut (mørk grønn). I steinalderen ble groruditt brukt som erstatning for flint som ikke fantes her i landet. Groruditten er solid og har skarpe kanter, og egnet seg derfor til å lage redskaper av. Derfor har vi mistanke om at dette er et meget gammelt brudd fra vikingetiden.
Location
Bruddet ligger helt syd på Ravnekollen. En vei tar av fra hovedveien til Romsås mot vest og går opp mot Ravnkollen. Bruddet ligger like etter der denne veien tar av.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddet"

Name of Locality : Ravnkollen 4
(Object Id : 0301,617,03,00)

Location
County : Oslo (03) Municipality : Oslo (0301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Marking point: Longitude: 10.8885160 Latitude: 59.9617770
EU89-UTM Zone 32
X-coord: 605449 m. Y-coord: 6648659 m.

Commodity
Main Type: Granite and other igneous rocks Sub Type: Syenite
Brickstone(Y/N):
Production
Activity: Stone quarrying Reserves:
Prod. method: Open pit mining Production:
Prod. status: Disused, closed Volume of dump:


Information(s) in free text format
Description
Størrelsen er ca. 10 m x 10 m og 5 m avsenkning. Bruddet ligger i en bratt skrent, og mye stor blokk er rast ned i bunnen.
Location
Bruddet er beliggende lengst sør på Ravnekollen øst for Ammerud.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddet"


The fact sheet was created on 28.03.2024

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