BLM had nothing to do with claims before 1976 Goldwasher. Locators just needed to record with the County back then.
The story smells for several reasons.
- Mining claim taxes are on the minerals - not the land, they do not count towards land parcel taxes.
- No County has the power to issue a property deed based on adverse possession. Only a court of law can decide for an adverse interest.
- Adverse possession has to be open and notorious - the property owner has to know that the land is being used adverse to their interest.
- Occupation of the land is required for adverse possession - occupation includes things like building houses, growing crops and improvement to the land. Mining claims do not occupy the land they occupy the minerals. Mining minerals is not occupation or an improvement to the land.
More than likely the story told is a mishmash of the 1968 California case where a tax sale of a patented mine property included three former mining claims was contested. The San Bernardino tax assessor messed up the tax bills on one of the patents because of a split school tax district and the owners who lost the land to the tax sale objected that the former mining "claim" was not part of the sale. They sued and lost the case and the land anyway. There was never any adverse possession but this story is so similar to the actual tax sale case I imagine that's how it got started.
Here's an example of an attempted adverse possession case in California based on a mining claim
Brown v. Murphy. Obviously the court shows that adverse possession can't be had just by mining the minerals on a property.
Heavy Pans