Road Construction Delays on Park Roads for 2014 Season
Expect occasional 15-minute to 1-hour delays in Sequoia and Kings Canyon National Parks on weekdays only (times vary), including delays to/from the General Sherman Tree, Crystal Cave, and Grant Grove. More »
Vehicle Length Limits in Sequoia National Park (if Entering/Exiting Hwy 198)
Planning to see the "Big Trees" in Sequoia National Park? If you enter/exit via Hwy. 198, and your vehicle is longer than 22 feet (combined length), please pay close attention to vehicle length advisories for your safety and the safety of others. More »
You May Have Trouble Calling Us
We are experiencing technical problems receiving incoming phone calls. We apologize for the inconvenience. Please send us an email to SEKI_Interpretation@nps.gov or check the "More" link for trip-planning information. More »
Mine Assessment Overview
Photo by Joel Despain
Today we are interested in mines for a different reason than wealth. Their presence in the parks is an important part of the history of the area, but their presence can also be dangerous for both people and the environment. All of the old mining sites in Sequoia are now abandoned and so come under the auspices of the Abandoned Mineral Lands Office of the National Park Services Geologic Resources Division, based in Denver, Colorado. This office has provided funding to assess the mines for hazards to both human health and safety and for their effects on the environment. Mine shafts and adits are often unstable, may contain toxic fumes or may suddenly end in deep drop-offs. They can be very dangerous places for the unprepared. The unusual chemistry of the rocks that are excavated at mines can often lead to acid mine drainage and heavy metal contamination. Both of these conditions can lead to poisonous environments near mines and contaminated water miles down stream from the mine site.
Did You Know?
The small gravity-defying cave formations found in Sequoia and Kings Canyon caves are known as helictites. They form due to the capillary action of acidic solutions and are composed of the minerals calcite and aragonite.