The mineral industry of Bhutan was small and dominated by the production of cement, coal, dolomite, and limestone, and was insignificant to its economy, which grew by 6% in 2001. Estimated production totals, in tons, for 2001 were: limestone, 280,000; dolomite, 265,000; cement, 160,000; gypsum, 55,000; quartzite, 53,000; ferrosilicon, 16,000; and talc, 3,800. Marble and slate were quarried for use as a dimensional stone; production totals in 2001 were estimated at 4,000 and 9,000 sq m, respectively. Dolomite has constituted an important export to India since 1960, and almost all the ferrosilicon output is exported to India. For centuries, silver and iron have been mined in Bhutan for handicrafts. Deposits of beryl, copper, graphite, lead, mica, pyrite, tin, tungsten, and zinc have also been found. A graphite-processing plant was established at Paro Dzong.