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Lemon's West Shaft, Wheal Unity, St Day, Gwennap, Cornwall, England, UKi
Regional Level Types
Lemon's West ShaftGroup of Shafts
Wheal UnityMine
St Day- not defined -
GwennapCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Key
Latitude & Longitude (WGS84):
50° North , 5° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~4km
Locality type:
Group of Shafts
Köppen climate type:


Although this location is correctly called Lemon's West Shaft of Wheal Unity, it is sometimes called Wheal Gorland by the English Government environmental protection body Natural England. In a bid to protect the minerals remaining in the mine dump the site was given legal protection and listed as a Site of Special Scientific Interest (SSSI)in June 1988. The legal documentation for this process was produced using the name Wheal Gorland. The mineral vein worked from this shaft is probably the same one worked from Bawden's Shaft of Wheal Gorland which was just the other side of the road only 90 metres away. To collect from this mine dump you need permission from the St. Day Rugby Club who are owners of the site, the owners of the mineral rights for the metalliferous minerals within the dump and written consent from Natural England as protecting authority. The site does contain examples of exceptionally rare minerals such as Liroconite and Clinoclase but the dump is in a very poor state of preservation. Following the removal of the neighbouring dump associated with Bawden's Shaft of Wheal Gorland the attention of mineral collectors moved to Lemon's West. Some holes were dug by collectors but the real damage was done when contractors moved a large area of dump to expose the mine shaft for capping. The country rock is quite soft so the ground around the shaft was removed prior to a large concrete plug being created. The mine dump, layer of top soil from under the dump, country rock and any nearby rubbish was pushed back and the dump profile restored. The area was left to vegetate and the current status today is described by Natural England as declining. Minerals do not remain stable in the long term in this unnatural environment with humus present. The South West Branch of The Russell Society successfully negotiated permission from Natural England to rescue minerals by digging two trenches using an excavator 14-15th July 2017.

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
British IslesGroup of Islands
Devon and Cornwall metalliferous mining district, England, UKMining District
Camborne-Redruth and St Day Mining District, Cornwall, England, UKMining District

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


3 valid minerals.

Detailed Mineral List:

Cassiterite
Formula: SnO2
Reference: David Ifold collection
Clinoclase
Formula: Cu3(AsO4)(OH)3
Reference: David Ifold collection
Liroconite
Formula: Cu2Al(AsO4)(OH)4 · 4H2O
Reference: David Ifold collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
Group 8 - Phosphates, Arsenates and Vanadates
Clinoclase8.BE.20Cu3(AsO4)(OH)3
Liroconite8.DF.20Cu2Al(AsO4)(OH)4 · 4H2O

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
AX2
Cassiterite4.4.1.5SnO2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)3(XO4)Zq
Clinoclase41.3.1.1Cu3(AsO4)(OH)3
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)3(XO4)Zq·xH2O
Liroconite42.2.1.1Cu2Al(AsO4)(OH)4 · 4H2O

List of minerals for each chemical element

HHydrogen
H LiroconiteCu2Al(AsO4)(OH)4 · 4H2O
H ClinoclaseCu3(AsO4)(OH)3
OOxygen
O LiroconiteCu2Al(AsO4)(OH)4 · 4H2O
O ClinoclaseCu3(AsO4)(OH)3
O CassiteriteSnO2
AlAluminium
Al LiroconiteCu2Al(AsO4)(OH)4 · 4H2O
CuCopper
Cu LiroconiteCu2Al(AsO4)(OH)4 · 4H2O
Cu ClinoclaseCu3(AsO4)(OH)3
AsArsenic
As LiroconiteCu2Al(AsO4)(OH)4 · 4H2O
As ClinoclaseCu3(AsO4)(OH)3
SnTin
Sn CassiteriteSnO2

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

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.
 
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