A steel grate safeguard at the Markey Mine in Utah allows mine ventilation patterns to continue unimpeded, an important consideration if bats inhabit portions of the mine. Note that safeguard construction protected the historic snow shed outside the mine entry.
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A cable net mine safeguard installed at the Annex Mine in Colorado. The window in this safeguard allows for bat populations to enter while excluding human visitation from the interior of the mine.
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Native rock bulkhead completed at the Peggy Mine in Colorado. Rocks collected near the mine are mortared together at the mine portal to prevent access to the interior of the mine.