Frontier Environmental Solutions' logo -- to home page
Frontier Environmental Solutions
Bat Gate at abandoned Mine Enterance
Home
Gate Designs
Our Qualifications
About our Company
Employment
How to Contact Us

Gate Designs for abandoned mines

Gates in Concrete Structures

Bat gates can be installed in concrete structures such as this wine cave.
This structure was designed to allow free access for bats while preserving the historic nature of the opening and existing wooden door.

(Click on picture for larger view.)

Gate before concrete wine cave
[top]
Air Vents

Air Vents

This is one way to cover a shaft that has no bat population but is part of an underground working that supports bats elsewhere. It maintains air flow patterns and thus the existing environment for transient or hibernating bats. This structure was designed to withstand a 5000 lb vehicle either driving on it or attacking it.

(Click on picture for larger view.)

[top]

Foam Closures

This is a mine with no bat populations. It has injured several explorers and has an unsafe oxygen level. The Forest service decided to have us close it.

(Click on picture for larger view.)

Mine to be closed
This polyurethane foam (PUF for short) is a sturdy way to close the shaft. The vent pipe is used to retain some of the airflow for other connected underground workings. This closure required carrying 165, twenty-five pound packs of foam for one-quarter mile.

(Click on picture for larger view.)

Mine filled with foam
The foam will deteriorate in direct sunlight. A foot of dirt as cover prevents the UV light from damaging the foam and hides its presence from vandals.

(Click on picture for larger view.)

Foam covered with dirt
[top]

Special Projects

Landmark "before" Workings around the opening.
This headframe was a favorite landmark of the area. It had been featured in several movies from 1930 through 1990. It was manifestly unsafe but was required to remain on site. The workings around the opening were extremely dangerous but were required to be maintained as is. Additionally, multiple bat sightings required a bat friendly structure.

(Click on picture for larger view.)

Bat gate The old headframe was removed and a bat gate was installed on a new concrete foundation. The structure enclosed all the historic workings and covered the safety hazards.

(Click on picture for larger view.)

Landmark "after" A new headframe was designed using steel I-beams covered with wood. The wood was held in place using steel bands to retain the original appearance. All external dimensions match the original and in a few years, the new wood will weather to the original color.

(Click on picture for larger view.)

[top]


Last updated:2/15/2017
Web by Run-Away-Train
Copyright © 2000 - 2011
____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____