Section 4
SEC. 4. Section 25 of Presidential Decree No. 463, as amended by Section 14 of Presidential Decree No. 1385, is further amended to read, as follows: “SEC. 25. Group Development. – The claim owner/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 the most advantageous and beneficial in the development and operation of said mining claims; Provided, That any expenditure 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: Provided, further, That if the expenditure incurred for any claim is less than that required in any year, the difference shall be paid and accrue to the Bureau of Mines and Geo-Sciences to be used exclusively for the purposes mentioned in Section 95 of the Decree.''