Until the discovery of petroleum—the preeminent segment of the Yemeni economy—the mineral industry had been limited to the production of cement, dimension stone, gypsum, and salt. In 2000, production of cement amounted to 1.4 million tons; dimension stone, 2.5 million cu m; marble, 86,000 sq m; gypsum, 100,000 tons; and salt, 150,000 tons. The government was focusing on creating conditions favorable to foreign investment, to develop the nation's mineral resources. The government had exclusive domain over the precious stone and hydrocarbon industries; mining legislation guaranteed the rights of private property for all other commodities. ZincOx Resources, of the United Kingdom, continued evaluating the Al-Jabail zinc deposit, which Anglo American Corp. had explored in the late 1990s.