Archaeological monitoring and recording were undertaken by South West Archaeology Ltd. (SWARCH) on behalf of a Private client, ahead of the proposed residential development and associated landscaping works at land north-east of Dean House, Leedstown, Hayle, Cornwall. The monitoring took place during trenching works looking to ascertain the extent and condition of the historical mining works within the proposed development boundary. The works were undertaken in accordance with a Written Schene of Investigation (Boyd 2023) drawn up in consultation with HEP Archaeology at Cornwall Council. During the site visit six narrow trenches were opened, with the aim of exploring the extent of previous mining works and locating the feature marked as a shaft on the 2nd Edition OS Map. Scrub and debris partially obscured portions of the site, mostly along the eastern edge, partially limiting the available area able to be investigated. The trenches were opened by a 0.8m toothed bucket. A shallow topsoil was present across the surface of the site, with an average depth of 0.1m. The topsoil overlay a deposit of mining waste material of varying depth from 0.4m to a maximum depth of c.0.9m in trenches 4 and 5; the mining waste comprised mostly of rubble and stone, with occasional modern rubbish such as 20th century glass bottles noted. Below this waste lay a buried soil layer, likely the previous topsoil layer before the site was levelled with mining waste, this also varied across the site with an average depth of 0.2m. The natural lay directly below this buried topsoil and comprised an orangey-brown silty-clay. The shaft was located within trench 5, with the mining feature measuring c.2.6m wide narrowing to c.1.6m. The shaft was excavated to an approximate depth of 3m, and had been infilled with a mix of mining waste material and modern debris, including metal and plastic waste. Additional machine work occurred following SWARCH monitoring and this demonstrated that this mining feature stopped at c.4m depth (Wheal Jane Consultancy comms.) and is not therefore a true mining shaft, but a deep and large prospection pit or shaft abandoned at a very early stage of excavation. No features or remains of archaeological significance were present within the excavated areas of the site area, with modern disturbances the only other features noted. The monitored excavations were recorded via GPS (Figure 1), and whilst the investigations are concentrated on only one part of the site, the...