Blue Circle Cement Quarry, Eastgate, Weardale, North Pennines, Co. Durham, England, UK
|Latitude & Longitude (WGS84):||54° 43' 40'' North , 2° 4' 39'' West|
|Latitude & Longitude (decimal):||54.72786,-2.07765|
|UK National Grid Reference:||NY950370|
|Other regions containing this locality:||Northern Pennine Orefield, England, UK|
The Pennines, England, UK
|Köppen climate type:||Cfb : Temperate oceanic climate|
The Blue Circle Cement Quarry works an exposure of the Great Limestone on the south side of the Wear River, between the villages of Eastgate and Westgate. The quarry was in operation from the mid 1960's until closure in 2002. It is the third source, along with the Heights Quarry and Rogerley Mine, of emerald green fluorite in Weardale. Fluorite crystals from the Cement Quarry are often paler green than either the Heights or Rogerley, and usually have a purplish gray cast due to internal purple color zones. Yellow, pale blue and purple fluorite are also found. Mineralization is found in flats associated with ore-bearing veins in exposures of the Great Limestone. No studies of mineralization in the quarry have been published, but it is likely that mineralization occurs along an extension of the Heights West Cross Vein on the south side of the River Wear.
8 valid minerals.
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
298.9 - 323.2 Ma
|Late Carboniferous sandstone|
|Bashkirian - Visean|
315.2 - 346.7 Ma
323.2 - 358.9 Ma
|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.