usgs_earth_mri_geochemcommodityOfficial surveyAuthoritative

USGS Earth MRI geochemistry

USGS

Per-element regional abundance summaries (sample count, detection rate, concentration quantiles) across rock/sediment/soil samples in critical-mineral focus areas

Source

How it's published

Feed (what to expect)

Versioned ScienceBase CSV (v12, growing); live-fetched, re-pull each version.

Cadence: growing compilation, versioned (v12, 2025-04-01)
Access: free anonymous download from ScienceBase
Format: wide CSV (EMRI_Data.csv; 176 analyte columns) + Access DB
Licence: public domain (USGS)
Vintage: v12-20250401
Upstream: https://doi.org/10.5066/P9WHRLXH

Quirks

One wide CSV with a Sample_Type medium column (vs NGDB's per-medium zips); melted + cross-method deduped to one value per (sample, element)
Oxide major columns (Cr2O3_pct, K2O_pct) are skipped; only single-element analytes map to a commodity
Modern actively-versioned successor to the legacy NGDB; same GeochemSummary surface

Critical-mineral focus-area geochemistry; emitted as GeochemSummary (per commodity x element x medium, ppm).

Reconciliation

Role in the canonical graph

Authority tier: Official survey
Provenance: Authoritative
Canonicality: tier 1
Primary for: —
Contributes IDs: —
Name-block matching: trusted
Reconcile profile: default (tier 1)

Schema

What it feeds & emits

Feeds (axes)

Supply

Record kinds

GeochemSummary

Identifier schemes

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