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Holmbush Mine, Callington United Mines (incl. Emmens United Mines), Stoke Climsland, Callington District, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 31' 29'' North , 4° 19' 4'' West
Latitude & Longitude (decimal): 50.52472,-4.31778
GeoHash:G#: gbuzmtxzu
UK National Grid Reference:SX358720
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate


Holmbush, Redmoor, Kelly Bray where usually worked in conjunction. The small mines of West Holmbush, East Holmsbush (Lady Beam), and South Kelly Bray were occasionally included.

The mine is quite old and was probably at work in the early 1600's, possibly mostly on the lead lode, and again in the late 1700's. From about the late 1830's the amalgamation of the mines may have started under various names to the final closure in 1892.
Holmbush mine developed five ENE-WSW copper-tin lodes of which only Holmbush and Flopjack was developed to any depth. A N-S lead lode was also worked. Where the lead lode intersects the E-W lodes it displaces them 15mts north on the east side. The lead lode was worked by levels driven north and south from the other two E-W lodes lodes between the 90 and 132 fathom levels. The two E-W lodes about 185mts apart where developed by a number of shafts to a depth of 390 mts.
The dumps were worked in 1919-21
Ref: Richardson P.H.G. (1991) Mines of Dartmoor & the Taymar Valley after 1913, Devon Books, Tiverton.
Dines 1956.
Hamilton Jenkin XV 1969.

There is a dump beside the Kelly Bray to Stoke Climsland road where the 2 engine houses have been partly restored and made safe. This dump has been partly cleared on the field side. Back a little towards Kelly Bray a small unmade track leads down into the valley. Beside this is another dump which has been almost completely cleared. Along the valley floor there is a very substantial dump which does not appear to have been touched by the reworking carried out in the early 1920s.
The grid reference marks the engine house ruin at Hitchins Shaft.


Mineral List


30 valid minerals. 1 (TL) - type locality of valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

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

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Early Carboniferous
323.2 - 358.9 Ma



ID: 3133623
Early Carboniferous limestone

Age: Mississippian (323.2 - 358.9 Ma)

Lithology: Major:{limestone}, Minor{claystone,siltstone}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Early Carboniferous
323.2 - 358.9 Ma



ID: 3192903
Paleozoic sedimentary rocks

Age: Mississippian (323.2 - 358.9 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Late Devonian
358.9 - 382.7 Ma



ID: 2034644
Upper Devonian Rocks (Undifferentiated)

Age: Late Devonian (358.9 - 382.7 Ma)

Lithology: Mudstone, siltstone and sandstone

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

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Dines, H.G. (1956): The metalliferous mining region of south-west England. HMSO Publications (London), Vol. 2, pp. 625-626.

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