Pentire Mine 3D Viewer

Designed by Ben Sumpter. A research viewer combining the surveyed underground workings of Pentire Mine with LiDAR terrain and the developing historical reconstruction of Pentire / Pentire Glaze.

3D underground survey

• Source: Pentire.svx / processed Pentire.3d, Survex survey data in British National Grid.
• Survey campaigns: 3 February 2019 and 28 October 2019.
• Control: fixed datum E194191 N80123, Z 5 m OD.
• Geometry: 145 processed survey legs and 150 stations. The webapp uses the loop-adjusted XYZ coordinates stored in the `.3d` file; underground Z is never draped to the DTM.
• KML: the supplied February 2019 KML is retained as an earlier first-campaign export; the later `.3d` is the complete source for the runtime model.

Terrain

Environment Agency 1 m LiDAR DTM tiles E190000_N075000 and E190000_N080000 are first mosaicked into one seamless 1 m raster, then sampled to a 4 m runtime mesh clipped to the supplied Pentire study boundary. This removes the artificial N=80000 tile-edge trench present in v0.1. Surface research/context vectors are draped to the merged DTM; underground Survex geometry is not.

Historical interpretation

The surface markers combine mapped/observed locations and explicit research hypotheses. Every marker exposes a confidence statement in Inspect. In particular, Whim Shaft → later Engine Shaft, the South Hill pumped shaft, and Derrick Shaft remain evidence-led interpretations rather than silent renamings.

Cost Book Explorer

The Cost Book panel embeds the complete diplomatic transcription through manuscript p.237, monthly cost-sheet totals, reconstructed workforce/career data, merchant bills, meetings and mapped-site mention indexes. Range calculations keep authoritative monthly totals separate from analytical subsets such as extracted labour and merchant rows.

Coordinate system

EPSG:27700 / British National Grid. Elevations are metres OD. No vertical exaggeration is used.

Surface context

User-supplied OSM road, waterway and building GeoPackages, the definitive public-rights-of-way layer, tithe record points, and OSGB c.1900 historic map points are clipped/registered to the study area and draped over the merged LiDAR surface. The supplied tithe file contains point locations rather than parcel polygons, so no tithe or field boundary is fabricated. BGS 1:625,000 bedrock and superficial geology is embedded as an offline terrain overlay.

Online mapping

Optional BGS, Esri, NLS and OpenStreetMap layers require network access and retain their providers' attribution. BGS/Esri requests are made directly in EPSG:27700; Web-Mercator tile layers use a local EPSG:27700→3857 affine registration with sub-metre maximum fitting error across the study area, then texture directly onto the terrain mesh. The core terrain and mine survey run offline.

Sources & credits

• Cost book: Kresen Kernow, AD2341/T/6, Pentire Glaze / Pentire United Silver Lead Mines Cost Book (1850–1856). Diplomatic transcription and structured extraction used by the Cost Book Explorer.
• Underground survey: Survex survey, 3 February 2019: Ben Sumpter, Pat Moret, Richard Bond, Pete Harrison and Tallan Bellman; additional survey 28 October 2019: Ben Sumpter and Pat Moret. Runtime geometry uses the processed Pentire.3d in EPSG:27700.
• Terrain: Environment Agency 1 m LiDAR DTM, National LIDAR Programme; source tiles E190000_N075000 and E190000_N080000.
• Geology: British Geological Survey, Geology 1:625,000 V5 and supplied QGIS layer definitions. Contains British Geological Survey materials © UKRI.
• Roads, buildings & waterways: OpenStreetMap data © OpenStreetMap contributors, ODbL; user-supplied extracts clipped to the study area.
• Public rights of way: Cornwall Council definitive Public Rights of Way data, user-supplied extract for St Minver Highlands.
• Tithe records: user-supplied Pentire Tithe extract; record links identify TheGenealogist tithe index/transcriptions. Original indexed wording is retained alongside normalized fields. An archival tithe-map reference has not yet been supplied.
• OSGB c.1900 historic map features: user-supplied Pentire OSGB1900 point extract. The source final_text descriptions and pin identifiers are preserved verbatim; exact underlying map edition/archive citation has not yet been supplied.
• Historic mine plan/section: Terry Davey, 2011, user-supplied Pentire Mine plan and section (image filenames AD2431_T_6_1 and AD2431_T_6_2).
• Surface interpretation: OS/grid locations and archaeological identifications supplied during this research project; confidence statements are retained in the viewer.
• Online optional layers: BGS, Esri, National Library of Scotland and OpenStreetMap; provider attribution is displayed dynamically whenever a layer is loaded.