Effect of gate installation on continued use by bats of four abandoned mine workings in western Montana

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August 4, 2012 | History

Effect of gate installation on continued use by bats of four abandoned mine workings in western Montana

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In 1996 the Mine Waste Cleanup Bureau of the Montana Department of Environmental Quality installed culvert gate systems in the portals of four abandoned mine adits in western Montana. Two gates were installed at the McDonald ("Ravalli") Mine adits in Lake County, and two more were placed in portals at the Gypsum Mine workings of Lewis and Clark Caverns State Park in Jefferson County. Inspection of these mine adits prior to gate installation revealed that each was used at some time during the year by bats, particularly Townsend's Big-eared Bat (Corynorhinus townsendii), a U.S. Fish and Wildlife Service species of special concern (Harvey et al. 1999). Gates were installed to allow for continued use of each mine working by bats while prohibiting accidental livestock entry and unauthorized access by humans. Gates were built with 13 mm rebar attached at an angle iron gate frame, using recommended vertical spacing at least 5.75 inches and horizontal spacing at least 24 inches (Tuttle and Taylor 1994, Dalton and Dalton 1995). The gate itself was attached to a corrugated metal pipe that was inserted into the mine portal, surrounding the pipe with fill to assure that entry into the mine was through the pipe and gate; the gate was secured with a protected padlock. Although the gate design was supposed to be bat-friendly, no follow-up study has been conducted at any of the sties to determine if bats were still using the sites after gates were in place. The objectives of the work described in this report were two-fold. First, determine the effectiveness of the gate design in its primary function of allowing continued access by bats to the mine workings. Second, gather mine environment data (temperature, relative humidity) continuously over a several month period to aid in characterization of the mine environments where bats occurred.

Publish Date
Language
English
Pages
13

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Published in

Helena, Mont

The Physical Object

Pagination
iii, 13 p. :
Number of pages
13

ID Numbers

Open Library
OL23296754M
Internet Archive
effectofgateinst00hendrich
OCLC/WorldCat
297457190

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August 4, 2012 Edited by ImportBot import new book
April 28, 2010 Edited by Open Library Bot Linked existing covers to the work.
January 23, 2010 Edited by WorkBot add more information to works
December 11, 2009 Created by WorkBot add works page