Invest News DetailToday's Zaman - A recent Mining Exploration Institute (MTA) report has revealed that there are 49 types of metals and minerals of commercial value, amounting to 50 billion tons, in underground reserves in Turkey. Turkey stands 28th among 132 countries in mine production and 10th in terms of metal and mineral diversity. Turkey hosts 77 of 90 different types of commercial metals and minerals that currently exist in the world. The MTA report shows that dolomite (white marble) ranks first with 15.8 billion tons in reserves. Turkey also has a marble reserve of 13.9 tons, 8.3 tons of lignite coal, 5.7 billion of rock salt, 1.2 billion tons of hard coal, a blister copper reserve of 1.9 billion tons and 1.5 billion tons of pumice. Sources note that the market value of Turkey's non-extracted metal and mineral reserves exceeds $2.5 trillion.