Group Development.
Section 25
SEC. 25. Group Development. - The claim owner or lessee may concentrate all the annual work obligations on any one or more of several contiguous or geologically related mining claims in one province, if it can be shown to the Director that such concentration of work will be most advantageous and beneficial in the development and operation of said mining claims: Provided, That any expenditure in any calendar year in excess of the minimum amount required for work obligations per hectare may be carried forward and credited to the work obligations of the group claims for the succeeding year or years: Provided, further, That, if the expenditure incurred for any claim is less than that required in any year, the difference shall be paid to the Bureau of Mines which shall accrue to its Mines Special Fund.