RT null T1 Hg Toolkit Example data request letter annex mining-smelters industry January 2017 A1 United Nations Environment Programme, K1 mining industry SN Not Available YR 2017 FD 2017-01 LK https://wedocs.unep.org/handle/20.500.11822/14785 UL https://wedocs.unep.org/handle/20.500.11822/14785 DS UN Environment Document Repository RD Nov 5, 2026