The Tolgus Calciner is situated on the B3300 Portreath Road. This is possibly the best preserved Bruton Calciner in Cornwall, it is a Grade Two listed building dating from 1933.
The condensing chambers are on the hill behind the site leading to a chimney at the top.
The Calciner was used to roast Tin Ore to remove Arsenic. This was an impurity, but if recovered it was sold on as a valuable by-product. The ore was loaded from the second floor of the building onto a slowly rotating hearth, this ensured the material was evenly heated. Beneath this were the furnaces, these would heat the ore to a stage where the impurities were released. The Arsenic was released as a vapour, this would condense is a long flue leading to a chimney on the hill. Workers would then remove the Arsenic from the flue where it would be bagged up and sold on. This was not a pleasant job without protective clothing.
The images on this page were taken in the mid 1990’s.
There is now a new page of images taken in 2013.