Eureka County, Nevada — Digital Twin

A comprehensive spatial, temporal, legal, economic, environmental, and demographic knowledge base for Eureka County, Nevada.

Eureka County sits in central Nevada — 4,180 square miles of basin and range, from the Diamond Mountains to the Sulphur Spring Range. Formed in 1873 from Lander County at the height of the Eureka Mining District boom, it peaked at 7,086 residents in 1880 and holds roughly 1,855 today. The county operates with no zoning, no building codes, and no building permits — one of the lightest regulatory environments in the United States.

This repository aims to be a machine-readable mirror of the county: every parcel, every statute, every watershed, every mine, every road. Not a summary — a clone.

Structure

eureka-co-nevada/
├── spatial/           Boundaries, terrain, parcels, hydrology, soils, imagery
├── scripts/           Data processing: clean, enrich, analyze (19 Python scripts)
├── map/               MapLibre viewer + PMTiles build (eureka.symbiont.systems)
├── temporal/          Historical timeline, change records, land patents
├── legal/             County code, NRS, ordinances, governance, water rights
├── economic/          Mining operations, ranching, county budget, tax base
├── environmental/     Climate, ecology, wildfire, water basin status
├── infrastructure/    Roads, power, telecommunications, airport
├── demographics/      Census, population, settlement patterns
├── research/          Cross-domain spatial analysis
└── sources/           Dataset manifest, provenance, fetch logs

Spatial Data

24 vector layers cleaned, enriched, and tiled through an 11-session overhaul:

• 674→256 fields (62% schema reduction) across all layers
• SSURGO soils enriched with 7 NRCS properties (830 mukeys, 100% hit rate)
• USGS wells enriched with NWIS depth, water level, aquifer data (781 wells)
• Tax parcels classified by owner type, value metrics derived
• Mining claims parsed: 27,496 active + 106,543 closed, legal descriptions extracted
• PMTiles: 236 MB vector tileset, all 24 layers, zoom 6-14
• NAIP 2022: 434 tiles, 140 GB, 60cm RGBIR COG with VRT mosaic
• 10m DEM: County-wide with hillshade and slope derivatives

Map Viewer

Interactive map at map/index.html — MapLibre GL JS with PMTiles protocol, Esri imagery basemap, layer toggles, feature inspector. Layers grouped by domain: Ownership, Extraction, Hydrology, Infrastructure, Ecology, Reference.

Cross-Domain Analysis

Three research documents from spatial joins across cleaned data:

• Mining claims × water features (99.6% of active claims within 1km of water)
• Ownership class × soil properties (hydric rating, drainage)
• Terrain suitability by PLSS township (154 townships classified)

Scope

• Spatial extent: Eureka County boundary (FIPS 32-011)
• Temporal extent: 1860s (mining district formation) through present
• Coordinate reference: EPSG:4326 (WGS84) for storage, EPSG:32611 (UTM 11N) for analysis
• Update cadence: Varies by domain — legal/governance annually, spatial as new data releases

Provenance

Every dataset tracked in sources/manifest.csv with origin URL, format, license, fetch date, and spatial/temporal coverage.

Related Repositories

• azura-terraforming — Site-specific research for the 39-acre Azura parcel in Crescent Valley
• eureka-land — CLI tool for querying BLM/State Lands/assessor parcel data
• groundwork — GIS platform used for spatial analysis

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Authored by Rowan Valle. By Symbiont Systems LLC.