Subsurface signal report
Mount Rushmore National Memorial, South Dakota
01 · What's Below
02 · Water
03 · The Land Above
- FEMA flood zone X — Outside the 100-year and 500-year floodplains. FEMA classifies this as minimal flood hazard area.
- 27 wildfire perimeters recorded within 5 miles (most recent 2015)
- No mapped landslide occurrences within 2 miles
- 25 EPA-tracked sites within 10 miles — most are routine monitored facilities
- No industrial-mineral activity recorded nearby
04 · Ownership & Rights
01What's Below
Rare Earth Elements
Magnets · defense tech · EV motors · semiconductor doping
Data: USGS Earth MRI
Battery metals
Grid storage · EV batteries · stainless steel
Data: USGS Earth MRI
Semiconductor & high-tech
AI chips · solar panels · LCDs · telecom
Data: USGS Earth MRI
Specialty critical minerals
Aerospace alloys · catalysts · steel-making · niche industrial
Data: USGS MRDS · USGS Critical Mineral Deposits v2 · USGS Earth MRI
Bedrock context · Macrostrat
Harney Peak Granite
Layered granite, pegmatitic granite, and pegmatite. Leucocratic, peraluminous, plagioclase-microcline-quartz-muscovite S-type granite. Tourmaline and biotite common, but biotite mainly in inner part of central mass. Central mass consists of hundreds of intrusions. More than 24,000 separate bodies of pegmatite and granite are known between the central mass and the line defining the outer limit of pegmatite and granite bodies. Several hundred zoned pegmatites in a peripheral zone contain deposits of feldspar, mica, beryl, and other rare-element minerals. Emplacement age of 1,715 ± 3 Ma for the main granite based on concordant U-Pb date for monazite (Redden and others, 1990), but the emplacement of some pegmatite bodies may have continued for ~10 million years.
Source: Macrostrat · Macrostrat (USGS-derived geologic map)
02Water
Groundwater context · USGS NWIS
Outside named principal-aquifer footprint
USGS does not classify this location under one of the named US principal aquifers. Local groundwater may still be present in unmapped or minor aquifers.
USGS monitoring wells nearby (50)
- 002S06E08ADB · Pennington County, SDUSGS 432333103252401
- 001S04E11ADD · Pennington County, SDUSGS 433840103360001
- 004S04E04B · Custer County, SDUSGS 434406103391301
- 004S05E06ABA · Custer County, SDUSGS 434414103333801
- 003S04E33CCDB · Custer County, SDUSGS 434420103391401
+ 45 more within 10 mi
Water salinity · USGS WQP
Median chloride: 8 mg/L · Fresh
| Parameter | Min | Median | Max | Unit |
|---|---|---|---|---|
| Chloride | 1 | 8 | 240 | mg/L |
| Total Dissolved Solids | 40 | 192 | 1970 | mg/L |
| Specific conductance | 0 | 281 | 2620 | uS/cm |
Salinity readings are from nearby USGS monitoring wells and reflect aquifer conditions, not the chemistry of your specific tap or well.
Sources: USGS NWIS · USGS Principal Aquifers · USGS Water Quality Portal
Water-demand context · News (Perplexity) · USGS
1 data center within 25 mi
On Lower Cretaceous aquifers
Coverage may be incomplete — some private, unmarked, or recently-built facilities may not appear.
News-sourced records are aggregated from public reporting (citations linked per record). GeoLocity does not independently verify project status or operator claims. Coverage of announced or recently-broken-ground facilities depends on public news availability.
County industrial water use · USGS 2015
Pennington County, SD
0.00 B gal/yr industrial (2015)
0 gal/person/year industrial per capita
USGS classification: “industrial” is SIC-code-based and primarily reflects manufacturing. Data center cooling is not explicitly categorized and may not be isolated in this figure. Most recent USGS dataset: 2015.
Future iterations may add: cooling-method classification per facility, permitted-but-not-yet-built data centers via state environmental permit databases, and per-facility water-withdrawal volumes where operators voluntarily disclose.
Sources: USGS Water Use Data · Perplexity sonar-pro
03The Land Above
Flood zone · FEMA NFHL
Zone X
Outside the FEMA 100-year floodplain
Outside the 100-year and 500-year floodplains. FEMA classifies this as minimal flood hazard area.
Source: FEMA Flood Map Service Center · Study: 46103C_FIRM1
Wildfire history · NIFC
This parcel is within a recorded fire perimeter (15 Pile Burning, 2015)
Historical federal fire-perimeter records — not a risk forecast or insurance determination.
Largest recorded fire nearby: 17,975.89 acres
Source: NIFC — National Interagency Fire Center · NIFC (National Interagency Fire Center) interagency fire perimeters
Environmental context · EPA
Environmental records within ~10 mi
Most are routine regulatory registrations — not evidence of contamination
In assessment / redevelopment: 3 Brownfields sites — land being assessed or redeveloped.
Routine registrations: 22 registered facilities (toxic-release reporters and hazardous-waste handlers) — common in any developed area.
To confirm conditions for a specific parcel, a Phase I Environmental Site Assessment by a licensed environmental professional is the standard tool.
Closest sites (top 5)
- US NATL PARK SERVICE MOUNT RUSHMORE NMEM · TRI facility0.4 miSD
- MOUNT RUSHMORE NATIONAL PARK · Hazardous-waste handler0.4 miSD
- XANTERRA PARKS AND RESORTS INC · Hazardous-waste handler2.3 miSD
- RUSHMORE FOREST PRODUCTS INC · Hazardous-waste handler5.7 miSD
- BLACK HILLS NATIONAL FOREST HILL CITY SHOP · Hazardous-waste handler6.8 miSD
Source: EPA Envirofacts · Brownfields, Superfund (NPL), TRI, RCRA layers
04Ownership & Rights
Federal-land mineral activity · BLM MLRS
Active federal cases nearby
Mining claims and federal mineral leases recorded within ~10 mi
Largest cases by acreage (top 5)
- WT 27320,580 acActive
- PINK PANTHER #113,030 acActive
- SDMT1053392483,520 acClosed
- RUBY 653,050 acActive
- RUBY 622,860 acActive
Mineral rights status
Unverified
Mineral-rights status defaults to 'unverified' — GeoLocity does not pull deed history. The state-default block below summarizes the state's framework for mineral-rights ownership when available. Confirm specific ownership with a licensed title professional.
Informational screening only — not legal advice. Confirm ownership with a licensed title professional before relying on any rights-status finding.