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Geologist and mining engineer Greg Graham inspects a bat gate at the entrance to the abandoned Gold Stake gold mine. The gate is designed to allow bats to fly in and out of the mine interior while keeping human visitors and other large animals excluded. Greg is opening the gate for a bat survey by biologists. Coleville National Forest, Washington.

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Filename: abandoned_mine_102907BMn-24.jpg
Copyright: Michael Durham
Image Size: 5900x3933 / 6.7MB; Greg Graham abandoned mine adit bat gate bat habitat coleville national forest gold mine gold stake mine mine mine entrance mining engineer
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Geologist and mining engineer Greg Graham inspects a bat gate at the entrance to the abandoned Gold Stake gold mine. The gate is designed to allow bats to fly in and out of the mine interior while keeping human visitors and other large animals excluded. Greg is opening the gate for a bat survey by biologists. Coleville National Forest, Washington.