Netural Drainage Transition (NDT)
nounPronunciation: /ˈnjuːtrəl ˈdreɪnɪdʒ ˈtrænzɪʃən/
The period and point at which mine drainage changes from acidic to neutral pH, indicating that acid-generating potential has been depleted or remediation efforts have succeeded. This transition is a critical indicator of reclamation progress.
Plain English
The point where acidic mine water becomes neutral, showing that acid-forming minerals are exhausted or treated.
Etymology & History
Usage
"Monitoring data indicated neutral drainage transition occurred five years after reclamation implementation."
Style guide notes: When referencing NDT, specify timeframe and monitoring duration to demonstrate sustainability.
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Related Terms
Frequently Asked Questions
What does neutral drainage transition indicate?
Either sulfide minerals are depleted or treatment systems have successfully neutralized acid formation.
How is NDT monitored and confirmed?
Through regular pH and metal concentration sampling; sustained neutral readings over multiple seasons confirm transition.
Why Test Candidates on This?
NDT is an important reclamation endpoint metric used to evaluate long-term site remediation effectiveness.
Required skill level: Mid