A Tin mine near the summit of Boswin Downs, approx 700 yards NE of Porkellis Chapel. Incorporates the ancients mines of Wheal Puffet and St Christophers. Reopened for a short while in 1907. Today (2011) heavily overgrown. Main shaft still open. Concrete base of stamps still visible in the overgrowth plus a number of well preserved buddles.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Cassiterite

ⓘ 'Tourmaline'

1 valid mineral.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Granite

Entries shown in red are rocks recorded for this region.

Igneous rock
- Normal crystalline igneous rock
  - Coarse-grained ("plutonic") crystalline igneous rock

Detailed Mineral List:

ⓘ Cassiterite

Formula: SnO₂

References:

Bernie Millington Collection

ⓘ 'Tourmaline'

Formula: AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z

References:

Bernie Millington Collection

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Cassiterite	4.DB.05	SnO₂
Unclassified
ⓘ	'Tourmaline'	-	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z

List of minerals for each chemical element

B	Boron
B	ⓘ Tourmaline	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
O	Oxygen
O	ⓘ Cassiterite	SnO₂
O	ⓘ Tourmaline	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
Sn	Tin
Sn	ⓘ Cassiterite	SnO₂

Geochronology

Geologic Time

Rocks, Minerals and Events

ⓘ Major polymetallic mineralization

~270 Ma

Cornwall, England, UK

Cisuralian

ⓘ Porphyry dikes intruded (latest age)	~275 Ma	Cornwall, England, UK
ⓘ Greisenization (latest age)	~280 Ma	Cornwall, England, UK
ⓘ Porphyry dikes intruded (earliest age)	~280 Ma	Cornwall, England, UK
ⓘ Formation of metallized pegmatites	~285 Ma	Cornwall, England, UK
ⓘ Greisenization (earliest age)	~285 Ma	Cornwall, England, UK
ⓘ Emplacement of major plutons	~295 Ma	Cornwall, England, UK

Other Regions, Features and Areas containing this locality

British and Irish IslesGroup of Islands

Eurasian PlateTectonic Plate

Rheno-Hercynian BeltOrogenic Belt

EuropeContinent

England
- Cornwall
  - Wendron and Falmouth Mining DistrictMining District
- Devon and Cornwall metalliferous mining districtMining District

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

Wendron Tin, A K Hamilton Jenkin

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