will officially certify thereon to its correctness; and in addition there must be attached to such plat of survey a certificate or sworn statement by the surveyor, as to the approximate value of the labor performed or improvements made upon the claim of the adverse party, and the plat must indicate the position of any shafts, tunnels, or other improvements, if any such exist upon the claim of the party opposing the application. Upon the foregoing being filed within the sixty days as aforesaid, the register, or in his absence, the receiver, will give notice in writing to both parties to the contest that such adverse claim has been filed, informing them that the party who filed the adverse claim will be required within thirty days from the date of such filing to commence proceedings in a court of competent jurisdiction, to determine the question of right of possession, and to prosecute the same with reasonable diligence to final judgment; and that, should such adverse claimant fail to do so, his adverse claim will be considered waived, and the application for patent be allowed to proceed upon its merits. When an adverse claim is filed as aforesaid, the register or receiver will indorse upon the same the precise date of filing, and preserve a record of the date of notifications issued thereon; and thereafter all proceedings on the application for patent will be suspended, with the exception of the completion of the publication and posting of notices and plat, and the filing of the necessary proof thereof, until the controversy shall have been adjudicated in court, or the adverse claim waived or withdrawn. Tunnels. Tunnels run for the development of a vein or lode, or for the discovery of mines, give the owner or owners the right of possession of all veins or lodes within 3,000 feet from the face of the tunnel to the same extent as if discovered from the surface, _i. e._, 1,500 feet on the lode; and locations on the line of such tunnels of veins or lodes not appearing on the surface, made by other parties after the commencement of the tunnel, and while the same is being prosecuted with reasonable diligence, shall be invalid; but failure to prosecute the work on the tunnel for six months shall be considered an abandonment of the right to all undiscovered veins or lodes on the line of said tunnel. To avail themselves of the benefits of the law, the proprietors of a mining tunnel will be required to give a proper notice of their tunnel location, by erecting a substantial post, bound or monument at the face or commencement thereof, upon which should be posted a good and sufficient notice, giving the names of the party or parties claiming the tunnel right, the actual or proposed course or direction, height and width. At the time of posting notice and marking out the lines of the tunnel, as aforesaid, a full and correct copy of such notice and location must be filed for record with the mining recorder for the district. Placer Claims.