Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Okel Tor Mine, Harewood, Calstock, Cornwall, England, UKi
Regional Level Types
Okel Tor MineMine (Abandoned)
Harewood- not defined -
CalstockCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Latitude & Longitude (WGS84):
50° 29' 57'' North , 4° 11' 34'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SX444689
Type:
Mine (Abandoned) - last checked 2023
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Calstock790 (2017)1.0km
Bere Alston2,164 (2018)1.9km
Gunnislake4,044 (2017)3.1km
Buckland Monachorum779 (2018)4.4km
Tavistock12,280 (2018)6.5km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
British Micromount Society, Devon and Cornwall Branch MeetingsLiskeard, Cornwall20km
Mindat Locality ID:
881
Long-form identifier:
mindat:1:2:881:0
GUID (UUID V4):
0
Other/historical names associated with this locality:
Okeltor Works


On the north bank of the River Tamar, first worked in about 1848.

Merged with Cotehele Consols about 1 1/2 miles to the west in 1882, the amalgamation was short lived and the company was wound up. Working on a reduced scale continued at Okel Tor until 1887.

ref: Mines and Miners of Cornwall XV - A K Hamilton Jenkin (1969)

The site is easily accessible along the riverside road from Calstock. The road then turns into the Tamar Valley Trail which climbs up the hillside above the site close to Engine Shaft. Though this gives a partial view of the stack etc at engine shaft, the buildings are largely obscured by trees.
A footpath turns off the trail through the main mine site and drops down steps at the far end to the river bank. This ends at a marshy area which was the settling ponds and now shows evidence of mine drainage presumably indicating the presence of a blocked adit.
Most of the site is however fenced and private.

The name 'Okeltor Works' appears on both the 1881 and 1905 6 inch to the mile Ordnance Survey maps, with the suffix 'tin, copper and arsenic'.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


7 valid minerals.

Detailed Mineral List:

Arsenopyrite
Formula: FeAsS
Cassiterite
Formula: SnO2
Chalcopyrite
Formula: CuFeS2
Childrenite
Formula: Fe2+Al(PO4)(OH)2 · H2O
'Chlorite Group'
Galena
Formula: PbS
Pyrite
Formula: FeS2
Sphalerite
Formula: ZnS
References:
Virginia Maine collectionIdentified by Virginia Maine: Visual Identification

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Sphalerite2.CB.05aZnS
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Arsenopyrite2.EB.20FeAsS
Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
Group 8 - Phosphates, Arsenates and Vanadates
Childrenite8.DD.20Fe2+Al(PO4)(OH)2 · H2O
Unclassified
'Chlorite Group'-

List of minerals for each chemical element

HHydrogen
H ChildreniteFe2+Al(PO4)(OH)2 · H2O
OOxygen
O CassiteriteSnO2
O ChildreniteFe2+Al(PO4)(OH)2 · H2O
AlAluminium
Al ChildreniteFe2+Al(PO4)(OH)2 · H2O
PPhosphorus
P ChildreniteFe2+Al(PO4)(OH)2 · H2O
SSulfur
S ArsenopyriteFeAsS
S ChalcopyriteCuFeS2
S GalenaPbS
S PyriteFeS2
S SphaleriteZnS
FeIron
Fe ArsenopyriteFeAsS
Fe ChalcopyriteCuFeS2
Fe ChildreniteFe2+Al(PO4)(OH)2 · H2O
Fe PyriteFeS2
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
SnTin
Sn CassiteriteSnO2
PbLead
Pb GalenaPbS

Geochronology

Geologic TimeRocks, Minerals and Events
Phanerozoic
 Paleozoic
  Permian
   Guadalupian
ⓘ Major polymetallic mineralization~270 MaCornwall, England, UK
   Cisuralian
ⓘ Porphyry dikes intruded (latest age)~275 MaCornwall, England, UK
ⓘ Greisenization (latest age)~280 MaCornwall, England, UK
ⓘ Porphyry dikes intruded (earliest age)~280 MaCornwall, England, UK
ⓘ Formation of metallized pegmatites~285 MaCornwall, England, UK
ⓘ Greisenization (earliest age)~285 MaCornwall, England, UK
ⓘ Emplacement of major plutons~295 MaCornwall, England, UK

Other Regions, Features and Areas containing this locality


This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

 
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