Metal detecting is prohibited in National Parks and also on many public lands including city and state parks.
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State Park Metal Detecting Rule and Regulation Detail:There is no specific law against use of metal detectors. However, they may not be used for mineralogical or historical / archeological collection.
While you can't pan for gold in Yosemite National Park, you can still strike it rich at quite a few places within Mariposa County. Below, you will find a guide to gold panning locations around Yosemite and Mariposa County.
(Bear spray/pepper spray is not allowed in Yosemite.) If you have food out and are having trouble scaring the bear away, pack up all your food and leave the area.
The Yosemite Museum has a small geological collection that represents the overarching geology of the park. Ranger-naturalists from the Yosemite Field School collected many of the park's specimens during the first half of the 20th century. (Collecting rocks within national parks is illegal without a research permit.)
If visitors spot a bear while in the park, it is a black bear-not a brown or grizzly bear. The last known grizzly bear was shot outside the Yosemite region in the early 1920s; the species no longer exists in California despite its presence on the California state flag.
No matter which season you are planning to visit Yosemite, layers will be important. During the spring, summer, or fall, we recommend wearing a base of shorts and a tank top or t-shirt then layering from there. Cargo pants that have removable sections are great.
All climbers staying overnight on big wall climbs in Yosemite must have a wilderness climbing permit. If you are doing a day climb, you don't need a wilderness climbing permit.
Officials also say building them disturbs small insects, reptiles, and microorganisms that live on the underside of these rocks. Not every cairn should be destroyed, though. “When used appropriately, rock cairns are great for navigation, safety, and delineating a new or hard-to-follow trail,” Yosemite officials noted.