Portal Closure
nounPronunciation: /ˈpɔːr.təl ˈkloʊ.ʒər/
The process of sealing, capping, or otherwise securing an underground mine entrance to prevent unauthorized access and control air/water flows. Portal closure designs range from simple gating to complex engineered structures with ventilation and water management components.
Plain English
Sealing or blocking mine entrances to prevent public access and control water and air movement.
Etymology & History
Usage
"The abandoned coal mine's portal closure included a reinforced steel grate to allow bat passage while restricting human entry."
Style guide notes: Specify closure type (gate closure, seal closure, capping) when describing particular installations.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
Why allow bats to pass through closed mine portals?
Many bat species use abandoned mines for hibernation; proper closure designs permit wildlife access while restricting human entry.
What materials are used in portal closure construction?
Steel grates, reinforced concrete, masonry, and specialized gates are common, selected based on site hydrogeology and stability.
Why Test Candidates on This?
Portal closure design and materials selection demonstrate understanding of safety, environmental, and engineering requirements.
Required skill level: Mid