State officials say caves on state land will remain closed to try to slow the spread of White Nose Syndrome among Tennessee's bat population.
The caves have been closed since July 1, 2009.
Not affected are caves on private land, including commercial caves.
Closed are caves, sinkholes, tunnels and abandoned mines on land owned by the Tennessee Wildlife Resources Agency, the Tennessee Department of Environment and Conservation and the Tennessee Department of Agriculture's Division of Forestry.
The Great Smoky Mountains National Park, U.S. Forest Service, Tennessee Valley Authority and the Nature Conservancy have also closed caves on their lands.