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Great Rock Mine, Hennock, Teignbridge, Devon, England, UK

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Latitude & Longitude (WGS84): 50° 37' 14'' North , 3° 39' 30'' West
Latitude & Longitude (decimal): 50.62081,-3.65839
GeoHash:G#: gbvruz0p9
UK National Grid Reference:SX827815
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate


An extensive mine complex producing micaceous Hematite for use in rust preventing paint until about 1950. Peak production of about 2500 tons / year was achieved in the 1940's one of the biggest uses being the Navy's battleship grey paint. The last record of mining as late as 1969. The sett comprises 5 east-west lodes worked principally by adits with few shafts. These can be viewed from the public footpath. The workings are barred and reported to be very unsafe. The high quality of the ore gained it the term 'Shining ore' which was adopted by the geological survey.
Ref: Richardson P.H.G. (1991) Mines of Dartmoor & the Taymar Valley after 1913, Devon Books, Tiverton.
Ref: Atkinson M. (1978) Dartmoor Mines (Mines of the granite mass), Dept Economic History, Exeter University.

Regions containing this locality

Devon and Cornwall metalliferous mining district, England, UK

Mining District - 752 mineral species & varietal names listed

Dartmoor National Park, Devon, England, UK

National Park - 234 mineral species & varietal names listed

Dartmouth and Teign Valley Mining District, Devon, England, UK

Mining District - 77 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


1 valid mineral.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Hematite'4.CB.05Fe2O3
var: Specularite4.CB.05Fe2O3

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Unclassified Minerals, Rocks, etc.
var: Specularite-Fe2O3

List of minerals for each chemical element

OOxygen
O HematiteFe2O3
O Hematite (var: Specularite)Fe2O3
FeIron
Fe HematiteFe2O3
Fe Hematite (var: Specularite)Fe2O3

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

Late Carboniferous
298.9 - 323.2 Ma



ID: 3157936
Clackmannan Group

Age: Pennsylvanian (298.9 - 323.2 Ma)

Stratigraphic Name: Clackmannan Group

Lithology: Major:{sandstone}, Minor{siltstone,mudstone}

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: 2033931
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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