Minister Al-Naimi went on to say that 21 concessions have been granted for large mining operations; another 20 for smaller mines, 17 for exploration, and 15 for surveys. The Ministry has identified some 1,270 sources of precious stones, and 1,170 sources of other valuable minerals. Investment, whether domestic or foreign, is still limited. Projects for the mining of for example phosphates, magnesium, and bauxite deposits are, however, part of the Saudi government's initiative to diversify its economic resources.