That the boundary line between the counties of Socorro [Catron] and Grant be, and the same is, hereby located, fixed and established as follows: beginning at a point upon the western boundary line of the state of New Mexico where said line is intersected by the line between townships 12 and 13 south of the New Mexico principal base line and running thence eastwardly along the line between said townships 12 and 13 south, to the point where the said line intersects the one hundred and eighth (108th) meridian west of Greenwich.