Fact Sheet for <b>Occurence 3238 - 010 Knepphauglia</b>

					Norsk versjon
	THE ORE DATABASE
	Occurence 3238 - 010 Knepphauglia
	(Object Id: 6526) (Last updated: 19.12.2022)

Location

County:

Akershus

Municipality:

Nannestad (3238)

Map 1:50000:

Nannestad (1915-3)

Map 1:250000:

Hamar

Coordinate system:

EU89-UTM Zone 32

East:

603450 m.

North:

6674410 m.

Longitude:

10.8657680

Latitude:

60.1933930

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Resource

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

Importance

Raw material meaning:

Not Assessed (reg. 18.02.2015)

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Mineralization

Era: Paleozoic Period: Permian

Genesis: Skarn formation Form: Lens

Main texture: Structureless Min. distribution: Semi-massive (20-50 % ore minerals)

Main grain size: Fine grained (< 1 mm) Main alteration: Skarn formation

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Oslo Region

Geotec.unit: Akershus Graben

Tectonic complex:

Igneous complex: Nordmarka-Hurdal Batholith

Group: Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Pyroxene Major mineral (>10%)

Gangue mineral Calcite Accessory mineral (<1%)

Ore mineral Sphalerite Major mineral (>10%)

Ore mineral Pyrrhotite Subordinate mineral (1-10%)

Ore mineral Pyrite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Host rock Hedenbergite skarn Sedimentary
Original rock :Limestone

Metamorphic facies :Contact

Wall rock Hornfels Sedimentary
Original rock :Argillaceous sediment

Metamorphic facies :Contact

Information(s) in free text format

Free text

Forekomsten ligger i en ca. 500x150 m stor xenolitt av hornfels, som er omdannede kambriske til undersiluriske alunskifre med kalksteinslinser, i forskjellige permiske dypbergarter i lia vest for Bjertnessjøen. Den består av en tilnærmet fullstendig gjengrodd dagskjæring og innerst i denne sees kun svart hornfels i veggen som er opptil 6 m høy. Fin- til grovkornet sinkblende finnes disseminert og i semimassive årer og linser i pyroksenskarn i blokker på tippen som har et volum på ca. 70 kbm.

Bibliography:

From NGU's Reference Archive:

Olerud, Svein , 1984

Metallogeny of the Elsjø area, northern Oslo Region, Norway.

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.64 (4);325-334 pages

Abstract:

The Elsjø area is situated in the northern part of the Oslo Region and consists of a 2 km² inlier of Palaeozoic metasediments. Cambro-Ordovician shales and limestones are enclosed in Permian intrusives and are contact metamorphosed and altered by metasomatic processes. The present investigation has defined three mineralisation types of interest: The heavy-metal content of the Alum shale, sphalerite-bearing skarn lenses within the Alum shale and molybdenite mineralisation in the underlying Permian granites. The Alum shale of the Elsjø area has a maximum thickness of more than 150 metres as a result of overthrusting and folding during the Caledonian orogeny. The highest heavy-metal content is in Upper Cambrian strata. The greatest average content is in 10.6 m thick layer with 160 ppm U, 200 ppm Mo, 930 ppm V, 11.6 % C and 2.8 % S. The Alum shale also contains lenses of hedenbergite-garnet skarn lenses with sphalerite mineralisation; these are alteration products of marble lenses in the shale. Similar sphalerite-bearing skarn mineralisation is also found in other stratigraphic levels on shear zones. The Palaeozoic sedimentary rocks are underlain by three types of Permian granites. Molybdenite occurs as scattered disseminations in the phyllic alteration zones of the granite. Propylitic alteration is common in both the underlying intrusives and in the Palaeozoic sediments. The molybdenite mineralisation has similarities with porphyry molybdenum type occurrences, but can also be interpreted as a roof zone mineralisation in the granites.

Fieldsamples

Sample No. Sample type Miscellanrous

JS-OS2148 Dump

Sampler: Sandstad/Mansur/...Stored: Løkken/...Size(kg): 2

Comment: Semi-massive sphalerite lenses/dissemination in green skarn

No. of registrated element analyses = 1

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

Name of Locality: Knepphauglia sør

(Object Id: 38201 10,01,00)

Location

County: Akershus Municipality: Nannestad (3238)

Map 1:50000: Nannestad (1915-3) Map 1:250000: Hamar

Coordinate system: EU89-UTM Zone 32

East: 603555 m. North: 6674295 m.

Longitude: 10.8675840 Latitude: 60.1923260

Show on map

Resource

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

Element(s): Zn

Resources and production

Activity: Pitting Reserves:

Operating method: Historical production:

Mineralogy

Relationship Mineral Amount

Gangue mineral Pyroxene Major mineral (>10%)

Gangue mineral Calcite Subordinate mineral (1-10%)

Ore mineral Sphalerite Major mineral (>10%)

Ore mineral Pyrite Subordinate mineral (1-10%)

Ore mineral Pyrrhotite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Host rock Hedenbergite skarn Sedimentary
Original rock :Limestone

Metamorphic facies :Contact

Wall rock Hornfels Sedimentary
Original rock :Argillaceous sediment

Metamorphic facies :Contact

Information(s) in free text format

Free text

Forekomsten består av en 10 m lang og 2-3 m bred dagkjæring med retning 235° og har en 3 m høy vegg i SV. I skjerpet finnes svart hornfels, grafitt-granatskarn (gravhola), svartskifer og kalkstein i veksling, men det er lite sulfidmineralisering. Sinkblende årer i pyroksenskarn og massiv magnetkis med spredte korn av svovelkis finnes i blokker på tippen som har et volum på ca. 60 kbm.

Fieldsamples

Sample No. Sample type Miscellanrous

JS-OS2146 Dump

Sampler: Sandstad/Mansur/...Stored: Løkken/...Size(kg): 2

Comment: Sphalerite vein in skarn with pyrite dissemination

No. of registrated element analyses = 1

JS-OS2147 Dump

Sampler: Sandstad/Mansur/...Stored: Løkken/...Size(kg): 2

Comment: Massiv pyrrhotite med dissemination av Pyrite+chalcopyrite

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 3238 - 010 Knepphauglia

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-OS2146 Dump 573 14300 27 82 364 1.2 10.0

JS-OS2147 Dump 765 28100 36 112 453 1.9 13.0

JS-OS2148 Dump 329 87900 16 27 54 2.5 6.0

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

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

JS-OS2146 -2.5 14.0 8 113.5 30 55.40 2 0 1

JS-OS2147 -2.5 11.0 10 246.0 60 88.70 2 0 2

JS-OS2148 5.0 9.0 7 375.0 10 124.00 4 0 51

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

Sample No. Se* Ga* Ge* In* S% V* Cr* Mn* Fe%

JS-OS2146 12.00 8.73 0.33 12.40 9.99 240 15 1385 22.10

JS-OS2147 16.00 9.35 0.27 28.50 9.99 200 12 1310 20.80

JS-OS2148 11.00 10.10 0.18 4.97 6.40 275 23 19150 12.50

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

Sample No. Th* W* Rb* Sr* Y* Zr* Nb* Ta* Cs*

JS-OS2146 2.88 2 5.5 28.1 42.0 18 2.00 0.12 0.09

JS-OS2147 2.10 3 10.9 24.8 22.6 26 2.90 0.19 0.10

JS-OS2148 4.63 1 3.4 115.0 27.6 42 4.90 0.32 0.17

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

Sample No. La* Ce* Li* Be* Na* Mg* Al* P* K *

JS-OS2146 157.50 207.00 43 4 3800 4100 13000 2190 1500

JS-OS2147 89.10 103.50 21 2 2400 2200 9700 1390 2700

JS-OS2148 41.50 68.70 49 8 1600 11800 23000 4510 500

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

Sample No. Ca* Sc* Ti* Te* Hf* Re* Tl*

JS-OS2146 23000 3.70 510 20.10 0.50 0 0

JS-OS2147 16100 2.50 710 24.30 0.70 0 0

JS-OS2148 ###### 4.40 1400 4.51 1.10 0 0

Era:	Paleozoic	Period:	Permian
Genesis:	Skarn formation	Form:	Lens
Main texture:	Structureless	Min. distribution:	Semi-massive (20-50 % ore minerals)

	Province:	Oslo Region
	Geotec.unit:	Akershus Graben
	Tectonic complex:
	Igneous complex:	Nordmarka-Hurdal Batholith

Relationship	Mineral	Amount
Gangue mineral	Pyroxene	Major mineral (>10%)
Gangue mineral	Calcite	Accessory mineral (<1%)
Ore mineral	Sphalerite	Major mineral (>10%)
Ore mineral	Pyrrhotite	Subordinate mineral (1-10%)
Ore mineral	Pyrite	Subordinate mineral (1-10%)

Relationship	Rock	Origin
Host rock	Hedenbergite skarn	Sedimentary Original rock :Limestone
		Metamorphic facies :Contact
Wall rock	Hornfels	Sedimentary Original rock :Argillaceous sediment
		Metamorphic facies :Contact

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
JS-OS2146	Dump	573	14300	27	82	364	1.2	10.0
JS-OS2147	Dump	765	28100	36	112	453	1.9	13.0
JS-OS2148	Dump	329	87900	16	27	54	2.5	6.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
JS-OS2146	-2.5	14.0	8	113.5	30	55.40	2	0	1
JS-OS2147	-2.5	11.0	10	246.0	60	88.70	2	0	2
JS-OS2148	5.0	9.0	7	375.0	10	124.00	4	0	51

Sample No.	Se*	Ga*	Ge*	In*	S%	V*	Cr*	Mn*	Fe%
JS-OS2146	12.00	8.73	0.33	12.40	9.99	240	15	1385	22.10
JS-OS2147	16.00	9.35	0.27	28.50	9.99	200	12	1310	20.80
JS-OS2148	11.00	10.10	0.18	4.97	6.40	275	23	19150	12.50

Sample No.	Th*	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*	Cs*
JS-OS2146	2.88	2	5.5	28.1	42.0	18	2.00	0.12	0.09
JS-OS2147	2.10	3	10.9	24.8	22.6	26	2.90	0.19	0.10
JS-OS2148	4.63	1	3.4	115.0	27.6	42	4.90	0.32	0.17

Sample No.	La*	Ce*	Li*	Be*	Na*	Mg*	Al*	P*	K *
JS-OS2146	157.50	207.00	43	4	3800	4100	13000	2190	1500
JS-OS2147	89.10	103.50	21	2	2400	2200	9700	1390	2700
JS-OS2148	41.50	68.70	49	8	1600	11800	23000	4510	500