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row_uid large_string	analyte large_string	value float64	source_file large_string
AnalyticMethod_Biblio.csv::0	AM_PUB_YEAR	1,996	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::1	AM_PUB_YEAR	2,017	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::2	AM_PUB_YEAR	2,017	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::3	AM_PUB_YEAR	2,017	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::4	AM_PUB_YEAR	2,017	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::5	AM_PUB_YEAR	2,017	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::6	AM_PUB_YEAR	2,017	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::7	AM_PUB_YEAR	2,017	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::8	AM_PUB_YEAR	2,015	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::9	AM_PUB_YEAR	2,015	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::10	AM_PUB_YEAR	2,015	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::11	AM_PUB_YEAR	2,015	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::12	AM_PUB_YEAR	2,015	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::13	AM_PUB_YEAR	2,015	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::14	AM_PUB_YEAR	2,015	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::15	AM_PUB_YEAR	1,987	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::16	AM_PUB_YEAR	1,996	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::17	AM_PUB_YEAR	1,987	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::18	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::19	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::20	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::21	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::22	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::23	AM_PUB_YEAR	1,981	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::24	AM_PUB_YEAR	1,993	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::25	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::26	AM_PUB_YEAR	1,987	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::27	AM_PUB_YEAR	1,984	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::28	AM_PUB_YEAR	1,977	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::29	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::30	AM_PUB_YEAR	1,975	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::31	AM_PUB_YEAR	1,990	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::32	AM_PUB_YEAR	1,976	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::33	AM_PUB_YEAR	1,987	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::34	AM_PUB_YEAR	1,970	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::35	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::36	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::37	AM_PUB_YEAR	1,996	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::38	AM_PUB_YEAR	1,996	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::39	AM_PUB_YEAR	1,986	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::40	AM_PUB_YEAR	1,986	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::41	AM_PUB_YEAR	1,986	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::42	AM_PUB_YEAR	1,986	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::43	AM_PUB_YEAR	1,986	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::44	AM_PUB_YEAR	1,986	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::45	AM_PUB_YEAR	1,990	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::46	AM_PUB_YEAR	1,996	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::47	AM_PUB_YEAR	1,996	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::48	AM_PUB_YEAR	1,996	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::49	AM_PUB_YEAR	1,996	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::50	AM_PUB_YEAR	2,007	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::51	AM_PUB_YEAR	1,975	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::52	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::53	AM_PUB_YEAR	1,987	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::54	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
AnalyticMethod_Biblio.csv::55	AM_PUB_YEAR	2,002	AnalyticMethod_Biblio.csv
BV_Ag_Mo.csv::0	Ag_ppm	12.5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::1	Ag_ppm	9.4	BV_Ag_Mo.csv
BV_Ag_Mo.csv::2	Ag_ppm	13.1	BV_Ag_Mo.csv
BV_Ag_Mo.csv::3	Ag_ppm	13.6	BV_Ag_Mo.csv
BV_Ag_Mo.csv::4	Ag_ppm	95.5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::5	Ag_ppm	23.6	BV_Ag_Mo.csv
BV_Ag_Mo.csv::6	Ag_ppm	10.7	BV_Ag_Mo.csv
BV_Ag_Mo.csv::7	Ag_ppm	1.5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::8	Ag_ppm	11.5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::9	Ag_ppm	8.4	BV_Ag_Mo.csv
BV_Ag_Mo.csv::10	Ag_ppm	17.1	BV_Ag_Mo.csv
BV_Ag_Mo.csv::11	Ag_ppm	9.2	BV_Ag_Mo.csv
BV_Ag_Mo.csv::12	Ag_ppm	9	BV_Ag_Mo.csv
BV_Ag_Mo.csv::13	Ag_ppm	7.5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::14	Ag_ppm	6.1	BV_Ag_Mo.csv
BV_Ag_Mo.csv::15	Ag_ppm	8.7	BV_Ag_Mo.csv
BV_Ag_Mo.csv::16	Ag_ppm	20.1	BV_Ag_Mo.csv
BV_Ag_Mo.csv::17	Ag_ppm	32.9	BV_Ag_Mo.csv
BV_Ag_Mo.csv::18	Ag_ppm	26.6	BV_Ag_Mo.csv
BV_Ag_Mo.csv::19	Ag_ppm	39.2	BV_Ag_Mo.csv
BV_Ag_Mo.csv::20	Ag_ppm	19.4	BV_Ag_Mo.csv
BV_Ag_Mo.csv::21	Ag_ppm	8.8	BV_Ag_Mo.csv
BV_Ag_Mo.csv::22	Ag_ppm	2.6	BV_Ag_Mo.csv
BV_Ag_Mo.csv::23	Ag_ppm	22	BV_Ag_Mo.csv
BV_Ag_Mo.csv::24	Ag_ppm	20.2	BV_Ag_Mo.csv
BV_Ag_Mo.csv::25	Ag_ppm	1.3	BV_Ag_Mo.csv
BV_Ag_Mo.csv::26	Ag_ppm	0.6	BV_Ag_Mo.csv
BV_Ag_Mo.csv::27	Ag_ppm	1	BV_Ag_Mo.csv
BV_Ag_Mo.csv::28	Ag_ppm	1.3	BV_Ag_Mo.csv
BV_Ag_Mo.csv::29	Ag_ppm	5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::30	Ag_ppm	5.6	BV_Ag_Mo.csv
BV_Ag_Mo.csv::31	Ag_ppm	5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::32	Ag_ppm	50	BV_Ag_Mo.csv
BV_Ag_Mo.csv::33	Ag_ppm	1.5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::34	Ag_ppm	5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::35	Ag_ppm	0.3	BV_Ag_Mo.csv
BV_Ag_Mo.csv::36	Ag_ppm	0.2	BV_Ag_Mo.csv
BV_Ag_Mo.csv::37	Ag_ppm	0.1	BV_Ag_Mo.csv
BV_Ag_Mo.csv::38	Ag_ppm	0.5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::39	Ag_ppm	0.1	BV_Ag_Mo.csv
BV_Ag_Mo.csv::40	Ag_ppm	1.5	BV_Ag_Mo.csv
BV_Ag_Mo.csv::41	Ag_ppm	0.6	BV_Ag_Mo.csv
BV_Ag_Mo.csv::42	Ag_ppm	50	BV_Ag_Mo.csv
BV_Ag_Mo.csv::43	Ag_ppm	70	BV_Ag_Mo.csv

End of preview.

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NGDOD — National Geochemical Database on Ore Deposits: Legacy Data

1,558,396 samples, 5,398,750 measurements. Nearly 30,000 historic ore and ore-related rock samples from U.S. mineral deposits and mining districts, covering 15 mineral system types and 42 mineral deposit types. Modernized from the USGS ScienceBase data release into two linked GeoParquet tables for AI, API, and GIS use.

Scope

No geological reinterpretation or machine-learning modelling was performed — this is a structural modernization only, preserving the original geochemical measurements, spatial information, and provenance.

geoparquet/samples.parquet — one row per sample: identifying/metadata columns (including mineral system/deposit type where present), latitude, longitude, point geometry (EPSG:4326)
geoparquet/measurements.parquet — long format: one row per (sample, analyte), join back to samples on row_uid
metadata.json — provenance, citation, counts, standardization notes, known caveats

Why two tables instead of one wide table

The legacy database mixes many analytical methods with inconsistent per-method columns across historic submissions. Splitting sample metadata from analyte measurements (long format) avoids hundreds of mostly-empty columns and is the standard structure for programmatic geochemistry access.

Caveats

Analyte vs. identifying/metadata columns were split per source table using keyword heuristics on column names (see ID_COLUMN_HINTS in the build notebook), not a hand-verified data dictionary — cross-check analyte column meanings against USGS documentation files bundled in the raw download before treating this as authoritative for a specific element or deposit type.

Source & Citation

Granitto, M., Hofstra, A.H., Schmidt, D.E., and Khoury, R.M., 2021, National Geochemical Database on Ore Deposits: Legacy data: U.S. Geological Survey data release, https://doi.org/10.5066/P944U7S5

License

CC0 1.0 Universal

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