[1] The drill hall was designed in the Victorian Free style, built in local granite and was completed in late 1862.

Above that, in the swept back section of the gable, there was a small roundel containing three artillery pieces surrounded by olive leaves and surmounted by the number "13", identifying the corps which it accommodated.

It was a substantial two-storey stone building, which has been described by the Drill Hall Project as "of no great architectural merit".

[3] The 13th (St Just) Cornwall Artillery Volunteer Corps formed the guard of honour for a visit by the Prince and Princess of Wales to Botallack Mine in 1867.

2 Heavy Battery, Cornwall Royal Garrison Artillery – Defended Ports, which was responsible for coastal defence.