Secondary Sulfide Oxidation
nounPronunciation: /ˌsɛkənderi ˈsʌlfaɪd ˌɒksɪˈdeɪʃən/
The chemical process where sulfide minerals exposed during mining become oxidized to produce sulfuric acid and iron compounds, occurring long after initial mine closure. This delayed reaction can persist for decades and contaminate groundwater and surface water with acidic, metal-laden discharge.
Plain English
Delayed chemical breakdown of sulfide minerals in mines that creates acid and metals in water.
Etymology & History
Usage
"Secondary sulfide oxidation continued to contaminate the watershed a decade after pit closure, requiring extended water treatment."
Style guide notes: Distinguish 'secondary' as temporal (delayed) rather than definitional; use precise chemical terminology.
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Related Terms
Frequently Asked Questions
Why does sulfide oxidation continue after mine closure?
Exposed sulfides continue reacting with oxygen and water indefinitely without active management intervention.
What water quality parameters indicate secondary oxidation?
Low pH, elevated iron, copper, zinc, and sulfate concentrations signal ongoing sulfide oxidation processes.
Why Test Candidates on This?
Critical for understanding long-term water quality risks and justifying perpetual treatment obligations in reclamation design.
Required skill level: Senior