The court, in an action for the recovery of a mine or mining claim where a patent is applied for, and the contest is pending in the land office of the United States, may, upon motion of either party to the suit, require the jury to return a special verdict, if tried by a jury; if not, then by a judge trying the same shall make a special finding as to the particular interest each party owns in the mine or claim in dispute, under and by virtue of the mining laws of the United States, which special verdict or finding shall be entered into the judgment and upon the record of the court trying the same: provided, however, there shall be no special verdict by the court or jury, except where the evidence shows both parties to the suit to have a bona fide interest in the mine or claim sued for: and, provided further, that no third person who may have entered upon such mining claim or any part thereof, for the purpose of locating or claiming the same before or during such litigation in the district court growing out of any contest in any United States land office in this state, shall acquire any interest either at law or in equity in the claim or any part thereof in dispute, and shall be deemed and declared a trespasser or trespassers, unless he or they have been, or may, during the pendency of such litigation in the district court resulting from such contest in the United States land office, by a proper application to the court, be made party or parties to such suit adverse to either of such litigants, or both, or shall have taken such legal steps to assert his or their claim in a court of competent jurisdiction within six months after the commencement of such contest in the United States land office.