Portreath Harbour Including Slipway To South South West

Portreath Harbour, built between 1760 and the 1860s, is constructed from killas and slate rubble, with dressed granite blocks. It comprises an outer harbour and two basins aligned on a north-west/south-east axis. The harbour's curved sides are formed by excavated natural rock. A short bullnose on the north side has a flight of steps secured by iron staples on its outer face. The south side features a long, curved pier, primarily of large dressed granite blocks, with lower sections showing earlier vertically-set rubble masonry. A gated slipway on the south-south-west side likely dates to the 1860s.

At the inner end, a short passage with slotted sides leads to the "new basin," begun in 1800 and designed to accommodate up to 25 vessels. This basin is rectangular, approximately 280 feet long and 95 feet wide, with side walls of large killas and slate rubble, interspersed with dressed granite blocks, and a recessed flight of steps at the north-west corner. Another passage opens into the "inner basin," constructed in 1846 and measuring approximately 200 feet long and 100 feet wide. This basin has side walls of large dressed granite blocks, a flight of steps at the north-west corner, and a slipway at the centre of the inner end.

The harbour's development was driven by the Basset family, facilitating the import of coal and the export of copper and tin ores, and was linked to inland mining areas by a tramroad connected to the Portreath Incline.