Historic England research records

Historic England Research Records

Trevellas Coombe Calciner System
Hob Uid: 1457065
Location : Cornwall St. Agnes
Grid Ref : SW7273505185
Summary : Trevellas Coombe Calciner System is a poorly preserved late nineteenth century reverberatory calciner and condensing system, situated on the dressing floors of a tin mine. It would have been used for the extraction of arsenic from tin ore. A wheelpit near the chimney may have operated a powered scrubber, but is probably residual from an earlier tin dressing floor. The site had suffered from extensive erosion by 1994.Calciners were structures used to extract arsenic from mined ores by controlled heating. By heating the ore under oxidising conditions the arsenic content could be sublimed off as a vapour, which cooled and condensed to form a white 'soot' or powder. The refined arsenic had a variety of uses such as: metal alloy, clarifying glass, medicinal purposes and to create pigment in paint. Trevellas Coombe Calciner System is contained within the World Heritage Site of the Cornwall and West Devon Mining Landscape.
More information : Trevellas Coombe Calciner System is a poorly preserved late nineteenth century reverberatory calciner and condensing system, situated on the dressing floors of a tin mine. It would have been used for the extraction of arsenic from tin ore. A wheelpit near the chimney may have operated a powered scrubber, but is probably residual from an earlier tin dressing floor. The site had suffered from extensive erosion by 1994. [1] Calciners were structures used to extract arsenic from mined ores by controlled heating. By heating the ore under oxidising conditions the arsenic content could be sublimed off as a vapour, which cooled and condensed to form a white 'soot' or powder. The refined arsenic had a variety of uses such as: metal alloy, clarifying glass, medicinal purposes and to create pigment in paint. [2] Trevellas Coombe Calciner System is contained within the World Heritage Site of the Cornwall and West Devon Mining Landscape. [3]

Sources :

Source Number : 1
Source :
Source details : Cranstone, D and Hedley, I. 1995: The Arsenic Industry, Cornwall, Site Assessment Number 16A
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Source Number : 2
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Source details : Cranstone, for the Monuments Protection Programme 1993: The Arsenic Industry.
Page(s) : 13-14
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Source Number : 3
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Source details : 1:2500, 2007
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Monument Types:

Monument Period Name : Victorian
Display Date : Buillt late C19
Monument End Date : 1900
Monument Start Date : 1867
Monument Type : Condenser, Flue, Reverberatory Calciner, Arsenic Calciner, Condensing Flue, Chimney, Wheel Pit, Dressing Floor
Evidence : Structure, Extant Building

Components and Objects:

Related Records from other datasets:

External Cross Reference Source : National Monuments Record Number
External Cross Reference Number : SW 75 SW 68
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Related Warden Records :

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Relationship type : General association

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Historic England Research Records

Trevellas Coombe Calciner System