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Bojewan Placers, Sancreed, Cornwall, England, UKi
Regional Level Types
Bojewan PlacersGroup of Placers
SancreedCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Key
Latitude & Longitude (WGS84):
50° 5' 12'' North , 5° 35' 35'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SW430270
Locality type:
Group of Placers
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Mousehole697 (2017)3.9km
Penzance19,872 (2017)5.3km
Madron626 (2017)5.5km
St Just1,957 (2017)7.5km
Marazion1,294 (2017)9.5km


H G Dines, The Metalliferous Mining Region of South-West England Vol 1, p105.

An alluvial deposit, near Bojewans, at the confluence of a valley that reaches the coast at Lamorna (above GR approximate only). A tin bearing gravel, with mainly cassiterite of the wood tin variety, frequently occurring coating quartz crystals

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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


Mineral List


4 valid minerals.

Detailed Mineral List:

Cassiterite
Formula: SnO2
Reference: Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
Cassiterite var: Wood Tin
Formula: SnO2
Reference: Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
Pyrrhotite
Formula: Fe7S8
Reference: No reference listed
Quartz
Formula: SiO2
Siderite
Formula: FeCO3
Reference: [Embrey & Symes, 1987, 123 - "Minerals of Cornwall and Devon"]

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
var: Wood Tin4.DB.05SnO2
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Siderite5.AB.05FeCO3

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
Group 4 - SIMPLE OXIDES
AX2
Cassiterite4.4.1.5SnO2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Siderite14.1.1.3FeCO3
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Cassiterite
var: Wood Tin
-SnO2

List of minerals for each chemical element

CCarbon
C SideriteFeCO3
OOxygen
O SideriteFeCO3
O CassiteriteSnO2
O QuartzSiO2
O Cassiterite (var: Wood Tin)SnO2
SiSilicon
Si QuartzSiO2
SSulfur
S PyrrhotiteFe7S8
FeIron
Fe PyrrhotiteFe7S8
Fe SideriteFeCO3
SnTin
Sn CassiteriteSnO2
Sn Cassiterite (var: Wood Tin)SnO2

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

British IslesGroup of Islands
Eurasian PlateTectonic Plate
UK

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