movement, but restricts unauthorized human entry.
Work was conducted by a five-person crew.
A total of 40 man-hours were required to fabricate the cupola, bat-gate, and air-flow gate. Earth excavation, culvert
installation, attaching the cupola, and installation of the vent shaft and air-flow gate took 150 man-hours. Site
reclamation, seeding, and associated tasks took 54 man-hours. Equipment used included a trackhoe, portable welder
and cutting torch, shovels and other hand tools, chainsaw, PPE, 300 lbs of mortar, 50 lbs of native seed mix, 6
weed-free straw bales, and 3 padlocks. All equipment and supplies except for seed mix and padlocks were provided
by the contractor. I participated with the State project representative in overseeing the site construction. This
required 7 days of my time, or $2,121 in funds.
White River National Forest contributed $6,500 in funds toward State contract reimbursement, or 13 percent of total
contract cost. CDOW contributed $8,000 and DRMS contributed $36,596. Total cost was $51,096.
Figure 3. A standard bat-gate also protects the lower mine.
Figure 4. The bat-gat project protecting the Townsend's big-eared bats in report in local community newspapers.
Installing the two bat-gates and air-vent shaft enhances approximately 30 acres of bat habitat, based on
20 acres representing the area for a mine opening heavily used by bats (lower adit) plus 10 acres representing
the area for a mine opening used by few bats (middle adit and air-vent, each 5 acres). Characteristics of habitat
that were enhanced are stabilized access to maternity roosting habitat, securing roost sites from human disturbance,
improving air flow to roost sites in the cave and mine, and maintaining roost sites in close proximity to foraging
habitat and water.
PRIMARY PARTNER LIST
Colorado Division of Wildlife - Glenwood Springs, CO; Colorado Division of Reclamation,
Mining, and Safety; Robert Congdon, Maree Love mineral claim holder; Pitkin County Open Space and Trails; and the
of the National Speleological Society.
All photos courtesy White River National Forest.