Total reported releases
Total reported releases at Marigold Mining CO have risen 95% since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Marigold Mining CO
Total reported releases 1.3M lb held roughly steady year over year (-4%). Total releases concentrations are up 95% since 2010.
32255 MARIGOLD MINE ROAD - 3 MILES S OF VALMY, Valmy, Nevada · 212220 · Metal Mining · operated by Ssr US Holding
Anomaly engine
Notable Signals
Lead And Lead Compounds
Lead And Lead Compounds at Marigold Mining CO have risen 65% since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
Lead And Lead Compounds
Lead And Lead Compounds concentrations are up 65% since 2010.
Nitrate compounds (water dissociable; reportable only when in aqueous solution)
Nitrate compounds (water dissociable; reportable only when in aqueous solution) concentrations are up 78% since 2012.
Mercury And Mercury Compounds
Mercury And Mercury Compounds concentrations are up 73% since 2010.
Propylene
Propylene concentrations are up 43% since 2012.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Humboldt County County, NV (no Census block groups within 3 miles — falling back to containing county): a population of 17,266. Why we surface this →
14.3%
Low-income
35.9%
People of color
7.7%
Under age 5
15.4%
Over age 64
Source: Census ACS 2018-2022 (5-year), county-level fallback. Indicator-level percentile and EJ-disparity scores are surfaced on the county page and the state page — they describe wider regional exposure burdens, not effects attributable to a single facility.
Source. EPA Toxics Release Inventory · retrieved 2026-05-07. Reporting year 2024. TRI is a federal public-domain dataset under 17 USC §105.
What this is not. TRI quantifies releases reported by the facility under EPCRA §313 — not ambient air or water concentrations measured at receptors. We do not attribute individual health outcomes to specific facilities; that exceeds what the data can support.