Section 10
SEC. 10. Subject to any existing rights, all valuable mineral deposits in public or in private land not closed to mining location, and the land in which they are found, excepting coal, petroleum, and other mineral oils and gas, which are now governed by special laws, shall be free and open to exploration, occupation, location, and lease, by citizens of the Philippines of legal age, or by associations, or by corporations organized and constituted under the laws of the Philippines: Provided, That at least sixty per centum of the capital of such associations or corporations shall at all times be owned and held by citizens of the Philippines.