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Calcining Plant at Treskerby Mine

A Grade II Listed Building in Redruth, Cornwall

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Latitude: 50.2489 / 50°14'56"N

Longitude: -5.2034 / 5°12'12"W

OS Eastings: 171721

OS Northings: 43678

OS Grid: SW717436

Mapcode National: GBR Z4.PJ7X

Mapcode Global: VH12K.R0JJ

Plus Code: 9C2P6QXW+HJ

Entry Name: Calcining Plant at Treskerby Mine

Listing Date: 24 May 1993

Grade: II

Source: Historic England

Source ID: 1253199

English Heritage Legacy ID: 436352

Location: Redruth, Cornwall, TR16

County: Cornwall

Civil Parish: Redruth

Built-Up Area: Redruth

Traditional County: Cornwall

Lieutenancy Area (Ceremonial County): Cornwall

Church of England Parish: St Day

Church of England Diocese: Truro

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The following building shall be added to the list:-

SW 74 SW
1535-0/6/10002 Calcining Plant at
Treskerby Mine
- II

Calcining plant. Late C19. Calciner built of coursed granite blocks with
galleting to mortar; St Day brick dressings to openings; labyrinth built
of rubble with similar dressings to openings; stack of coursed granite
with stepped cornice to St Day brick flue.
PLAN: calciner of square plan sited to NE of labyrinth with baffles
which is connected to stack to SW.
Calciner has segmental-arched openings to 3 sides, including entry for
removal of ash to NE and former furnace entrance wits splayed sides to
former iron doors to SE. The interior has circular-plan walls which
encased riddler sitting on squared walls to ash box at lower level; to
SW corner is a hole for the exit of gases into the labyrinth.
The labyrinth has lost its original brick roof where the gases condensed
and the arsenic was scraped off; some springers to originally
segmental-vaulted ceiling remain; narrow round-arched access doors at
regular intervals; there is a splayed opening for draught inlet at NW
end and slots for portcullis doors for the control of gases; granite
lintels over final baffle area next to stack.
Treskerby mine was an important producer of 18th and 19th century copper
ore. The calcining plant here, exceptional for its completeness as an
example of this building type, probably reflects a late re-use of this
site, when copper burrows would have been re-crushed and calcined for

Listing NGR: SW7172143678

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