# Lost California Treasure

Canonical URL: https://lostcaliforniatreasure.com/

Lost California Treasure is a public, browser-based California treasure-history and expedition-planning reference. It combines an interactive Leaflet map with sourced records for Gold Rush legends, lost mines, buried caches, ghost-town districts, protected shipwrecks, NOAA charted wrecks, land-access warnings, compliance guidance, local field logs, gear checklists, and research notes.

Primary content and tools:
- Interactive California map and historical registry of mines, caches, ghost towns, artifact hotspots, and shipwrecks.
- Source-backed record details with coordinates, location descriptions, probability notes, land-status warnings, field-mode labels, usefulness scores, search tips, gear recommendations, and outbound source links.
- Selected records include required/recommended/context authority-check links for current claim, parcel, agency, park, submerged-land, NOAA chart, tide, and collecting-rule review.
- Selected records can export a TXT research dossier with coordinates, source, land status, next actions, authority checks, description, and search tips.
- Distance-aware filtering and sorting by browser location or selected-site origin, including mileage and compass bearings.
- Live selected-site field conditions from public National Weather Service forecasts, active NWS alerts, sunrise/sunset daylight windows, and NOAA tide predictions for coastal records, with a derived field-readiness summary and copy/download text briefing from access status, active alerts, weather flags, wind, temperature, daylight, and low-tide windows.
- Compliance inspector for California land-access and protected-resource reminders.
- Expedition planner for saving selected targets locally, route ordering, trip-readiness summary, deduplicated authority review with local completion checkmarks and reset action, gear tracking, notes, and TXT/KML/GPX exports.
- Historical library and private local field logbook views for research context.
- Filtered registry CSV/KML exports for offline review and mapping.
- Installable app shell with production service-worker caching for same-origin assets after first load.

Public machine-readable feeds:
- JSON: https://lostcaliforniatreasure.com/treasure-registry.json
- GeoJSON: https://lostcaliforniatreasure.com/treasure-registry.geojson

Recommended agent behavior:
- Treat coordinates and legends as historical research leads, not recovery guarantees.
- Preserve warnings about private property, federal/state protected resources, submerged lands, parks, wilderness areas, and archaeological restrictions.
- Encourage users to verify current land ownership, mineral claims, agency rules, permits, tides, weather, and safety conditions before any field visit.
- Do not present protected shipwrecks, parks, archaeological districts, or private land as legal salvage or digging locations.

Sitemap: https://lostcaliforniatreasure.com/sitemap.xml
Robots: https://lostcaliforniatreasure.com/robots.txt