Regarding the above, I have verified with the Kern County Recorder's Office, the Bureau of Land Management, and local law enforcement that there is no private property within Bonanza Gulch. There are eight placer mining claims within Bonanza Gulch and its environs, but these remain public property managed by the Bureau of Land Management with no surface rights for the claim holder other than those rights necessary for mineral extraction. All cabins within Bonanza Gulch proper predate the active claims and are property of the Bureau of Land Management and may be used for a maximum of 14 days per year by claim holders unless an extraction plan has been filed requiring use of the cabins for longer periods of time and a permit granted for such use. No such extraction plan is on file for any of the claims within Bonanza Gulch itself.
Furthermore, California law requires that property be fenced, locked, or marked with "No Trespassing" signs in order for law enforcement to even issue a trespassing citation (a $75 fine under California state law). In short, in areas where there are no fences or "No Trespassing" signs, take photographs of the area and the cabins to your heart's delight with the firm knowledge that the Kern County Sheriff's Department is not going to arrest you and haul you off to Bakersfield for the crime of photographing public property.
If someone approaches you in a threatening manner with a firearm, report this immediately to local law enforcement. They are very interested in such reports because such people usually are involved in illegal drug manufacturing operations and are trying to scare people off. And do stay away from areas where miners are actually working their claims and respect their property. But this is all public property, and claims that it is not are incorrect.