portal
nounPronunciation: /ˈpɔːrtəl/
The surface entrance to an underground mine workings. A critical feature requiring assessment and closure during mine reclamation.
Full Definition
The surface entrance or opening that provides access to underground mine workings, including shafts, adits, and tunnels. In abandoned mine reclamation, portals represent potential safety hazards and environmental concerns requiring careful evaluation, documentation, and appropriate closure methods. Portal conditions significantly influence reclamation strategies and closure techniques. The term encompasses both the physical opening and the immediate surrounding area that may require remediation.
Plain English
The opening or entrance to an underground mine that needs to be safely sealed during cleanup and restoration work.
In Editorial Context
A key subject in abandoned mine reclamation content, often featured in safety discussions, closure method comparisons, and before-and-after documentation of reclamation progress.
Etymology & History
Originally referred to architectural entrances; adopted by mining industry to describe mine entrances as mining operations expanded underground in the 18th-19th centuries.
Meaning has expanded from simple entrance to include the complex engineering and environmental considerations surrounding mine openings in reclamation contexts.
Usage
"The reclamation team identified twelve abandoned portals requiring immediate closure to prevent unauthorized access and wildlife entrapment."
Usage note: Always specify the type of portal (adit, shaft, tunnel) when technical precision is required.
Context: mine closure plans, safety assessments, reclamation documentation, environmental impact studies
Region: international
Also known as
Contrasted with
Don't confuse with
Often confused with 'adit' which is specifically a horizontal entrance, while portal is the general term for any mine entrance.