Section 4
SEC. 4. Section 37 of Presidential Decree No. 463, as amended by Section 8 of Presidential Decree No. 1677, is further amended to read as follows: "SEC. 37. Program of Work.—A claimowner shall, upon the filing of an application for mining lease, undertake exploration, development and/or mining activities thereon in accordance with the approved program of work: Provided, That within the period of FIVE (5) YEARS, reckoned from the date of the grant of the lease contract thereon, the mining area shall be placed in actual commercial production: And provided, further. That failure to do so within the period aforestated shall constitute automatic abandonment of the mining- claims. The program of work shall be for a period of FIVE (5) YEARS, and the claimowner shall, at the start of every calendar year and during the existence of the mining lease, submit to the Bureau of Mines and Geo-Sciences for the approval of the Director an annual work program describing in detail the kind and nature of mining activities to be undertaken thereon for that particular year. Any deviation from, the approved work program shall be with the approval of the Director. Holders of existing mining leases shall submit a revised, or updated program within six (6) months from the date of approval of this Decree. The Regulations shall prescribe in detail the contents of the work program."