9 separate mines listed in referenced UCET article. See link for full details.
Length
Mine #1 ~ 400 feet
Mine #2 ~ 400 feet
Mine #3 ~ Unknown
Mine #4 ~ 150 feet
Mine #5 ~ 300 feet
Mine #6 ~ 200 feet
Mine #7 ~ 40 feet
Mine #8 ~ 10 feet
Mine #9 ~ 50 feet (to cave passage)
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