You might want to back up and read the mining law salty.
A lode claim can only be located for valuable mineral in place (hardrock).
A placer claim can only be located for unconsolidated material (not still in place).
Both types of claims encompass
all valuable minerals wherever they may be found within the bounds of the claim.
If the claim owner finds loose unconsolidated (placer) valuable minerals on their valid lode claim those minerals belong to the lode owner.
If the claim owner finds mineral in place (lode) on their valid placer claim those minerals belong to the placer claim owner.
There is no such language or concept in the mining laws as a limited depth to a placer claim just as there is no such concept as a limit to the depth of a lode claim.
Here's a link to the
General Mining Act of 1872. Notice that right there in the beginning of Section 2 it states:
You will find one small exception to that right when it comes to patenting placer claims as described in Section 11 of the same law.
You won't find anywhere in the law that a placer claimant is restricted to mining placer material. If it's within the bounds of the claim the valuable minerals belong to the locator no matter what form they take.
The difference in a placer and lode claim
when they are located is what type of mineral discovery the initial claim is based on. Past that point other discoveries on the same claim do not limit the rights to the claimants ownership of
all the minerals within the claim no matter how or where the claimant discovers them.
The Supreme Court explained it well in the important case of Clipper v Eli 194 U.S. 220 in 1904:
Their are several other Supreme Court decisions quoted in Clipper v Eli stating the same thing. It's a very old principle of law.
Understanding the differences between lode and placer discoveries is critical to properly locating a claim but once that claim is located the same rights apply to both the placer locator and the lode locator. Neither is limited in their ownership of any and all valuable minerals found within their claim.
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