With regard to the extent of surface ground adjoining a lode or vein, and claimed for the convenient working of the same, it is provided that the lateral extent of location, made after May 10th, 1872, shall, in no case, exceed 300 feet on each side of the middle of the vein at the surface, and that no such surface rights shall be limited by any mining regulations to less than 25 feet on each side of the middle of the vein at the surface, except where adverse rights, existing on the 10th of May, 1872, may render such limitations necessary; the end lines of such claims to be in all cases parallel with each other. By the foregoing it will be seen that no lode-claim, located after May 10th, 1872, can exceed a parallelogram 1,500 feet in length by 600 in width, but whether surface ground of that width can be taken depends upon the local regulations, or State or Territorial laws then in force in the mining districts; but no such local regulations, or State or Territorial laws, shall limit a vein or lode-claim to less than 1,500 feet along its course, nor can surface rights be limited to less than 50 feet in width, unless adverse claims, existing on May 10th, 1872, render such lateral limitations necessary. It is provided by the Revised Statutes that the miners of each district may make rules and regulations not in conflict with the laws of the United States, or of the State or Territory in which the districts are situated, governing the location, manner of recording, and amount of work necessary to hold possession of a claim. In order to hold a possessory right to a location made prior to May 10th, 1872, not less than $100 worth of labor must be performed or improvements made thereon, within one year from the date of such location, and annually thereafter; in default of which the claim will be subject to re-location by any one else having the necessary qualifications, unless the original locator, his heirs, assigns, or legal representatives, have resumed work after such failure and before the re-location. The expenditures required upon mining claims may be made from the surface, or in running a tunnel for the development of such claims. The Act of February 11th, 1875, provided that where a person or company has run a tunnel for the purpose of developing a lode or lodes, the money so expended shall be considered as expended on the said lode, and the owner or owners shall not be required to perform work on the surface to hold the claim. Individual proof of citizenship may be made by affidavit. If a company, unincorporated, by the agent’s affidavit; if a corporation, by the filing of a copy of charter or certificate of incorporation. Locators against whom no adverse rights rested on the date of the Act of 1872, shall have, on compliance with general law and recognized custom, the exclusive right to Possession and Enjoyment