portal sealing
nounPronunciation: /ˈpɔrtəl ˈsiləŋ/
The permanent closure of mine entrances using engineered barriers to prevent unauthorized access and environmental contamination.
Full Definition
Portal sealing involves the construction of permanent barriers at underground mine entrances to achieve multiple objectives including public safety, environmental protection, and regulatory compliance. The sealing design must accommodate site-specific conditions such as mine gas emissions, water discharge, structural stability, and long-term performance requirements. Common sealing methods include concrete bulkheads, engineered backfill, or combination approaches that may incorporate drainage systems, ventilation controls, or monitoring access points. Portal seals must be designed to withstand internal pressures from mine gases or water while preventing unauthorized entry for decades or centuries.
Plain English
Permanently blocking the openings to old underground mines with concrete or other strong materials to keep people out and prevent pollution from escaping.
In Editorial Context
A standard reclamation practice featured in mine closure articles that requires explanation of design considerations, construction methods, and long-term monitoring requirements, often illustrated with before-and-after photos.
Etymology & History
Developed as mine safety regulations required permanent closure of abandoned underground workings to prevent accidents and environmental releases.
Early methods were often temporary; evolved to permanent engineered solutions as environmental concerns and liability issues increased.
Usage
"The abandoned mine inventory identified 47 portals requiring immediate sealing to eliminate safety hazards and prevent further acid mine drainage discharge."
Usage note: Specify whether sealing is designed to be gas-tight, water-tight, or allow controlled venting based on site conditions.
Context: mine closure plans, safety protocols, environmental compliance
Region: international
Also known as
Contrasted with
Don't confuse with
Shaft capping involves vertical openings while portal sealing addresses horizontal or inclined entrances