Issuance of a notice of trespass may occur if an unpatented claim/site is:
- Used for a homesite, place of business, or for other purposes not reasonably related to mining or milling activities
- Used for the mining and sale of leasable minerals or mineral materials, such as sand, gravel and certain types of building stone or
- Located on land that for any reason have been withdrawn from location after the effective date of the withdrawal.
Trespass actions are taken by the Field Office.