As for your question, a placer claim is ONLY for the loose, placer material on that claim. A hard rock claim is ONLY for the minerals that are bound within the rock. You can choose to file a hard rock claim over the remainder of the placer claim, if you wished, but you would have to work something out with the current claim holder as to access. However, anything that is hard rock and within the boundary of your claim is yours. If you have to access your hard rock through the portion that overlaps, then again, you must work things out with the placer holder.
EDIT: Btw, if it sounds like I know what I'm talking about, I don't!! Clay Diggins or one of the other more knowledgeable people can better answer your question, although I "believe" my post is correct.
This is a common misunderstanding kcm. Each type of claim transfers ownership of ALL the valuable locatable minerals within their boundary. Lode claims own any placer material found on the claim and placer claims have exclusive rights to the lodes they may discover.
The difference in these two claim types (there are 4 claim types total) is that placer claims are made on the basis of a discovery of a valuable placer deposit and lode claims are made on the basis of a discovery of a valuable lode deposit. Once the claim has been located the locator is entitled to
all the valuable locatable minerals found on the claim whether they be lode or placer in nature.
You can not locate a valid lode claim on the basis of the discovery of placer material and you can not locate a valid placer claim on the basis of the discovery of a lode. The type of mineral discovery determines the type of claim but the type of claim does not limit the exclusive right of the locator to all the minerals within the claim no matter whether they be placer or lode in nature.
No valid placer claim can ever be made over a valid preexisting lode claim. In some very limited circumstances a valid lode claim can (and sometimes should) be made over a valid preexisting placer claim. No uninvited prospector can prospect on either type of claim.
Once a claim has been patented all this doesn't make any difference. Patented claims become private property the day the patent is granted. They are no longer mining claims nor are they a subject of the federal mining laws discussed above.
These private properties have all the rights given in the patent document. Among those is the right to sell any portion of the property in any way the patent holder wishes. Often these private properties sell off their surface estate so developers can build houses while the patent owner retains or sells separately the subsurface mineral rights. That's why, in most cases, when you buy a house land or a farm you don't get the mineral rights.
To be very clear here - unless your deed specifically states that you are purchasing full mineral rights in a property you don't have any right to the minerals even though you "own" the house or property. If there is no sale of mineral rights spelled out in the deed you didn't buy the minerals - someone else has the rights to the minerals on and below the surface. Very few residential properties in the western states come with mineral rights.
So let's say you do have a deed with already paid for mineral rights. Then the type of mining you might be able to do is controlled by the original patent grant, the deed restrictions and local zoning laws. Those will be different for each private property. Federal mining law has nothing to do with your rights to mine patented property.
As winners already pointed out a patent granted for a lode claim usually allows you to follow the existing discovery underground outside the long sides of the patent but not outside the short ends. A patent granted for a placer claim restricts your future mining rights to the boundaries of the patent.
Virtually all (99.999%) of the private land in the western states was created by patent grants. Mining claim patents include the mineral rights. Most other patents do not. Wherever you live in the western states you will be living on patented land. Whatever land rights came with that patent grant are spelled out in detail in the patent itself.
Goldwasher and winners already made most of these points. You will find wisdom and knowledge you can rely on in those gentleman's posts.
Heavy Pans