ᎠᎳᏏᏅᏙᏗ ᎠᏕᎸ ᏓᎶᏂᎨ ᎤᏲᏨᎯ ᏰᎵᏇ ᎾᏍᏋ achieved ᏂᏛᎴᏅᏓ ᏭᏚᎸᏛ ᏗᎬᏙᏗ ᏓᏲᏓᏅ ᏥᏄᏍᏗ ᎤᏍᏗ ᏥᏄᏍᏗ 0.5 g/1000 kg (0.5 ppm) ᎾᎿ ᎢᎦᏘᎭ ᎢᎬᏁᎸ ᎭᏫᎾᏗᏢ ᎡᏆ ᎠᎯᏗᎨᎢ mined ᏚᏂᏍᏆᏂᎪᏛ, ᏫᏚᏳᎪᏛ ᏭᏚᎸᏛ ᏗᎬᏙᏗ ᏓᏲᏓᏅ ᎭᏫᎾᏗᏢ ᎠᏍᏚᎢᏛ-ᎦᏙ ᎠᏔᎴᏒ ᎠᏆᏤᎵ ᎠᎴ 1–5 g/1000 kg (1-5 ppm), ᏭᏚᎸᏛ ᏗᎬᏙᏗ ᏓᏲᏓᏅ ᎭᏫᎾᏗᏢ ᎭᏫᎾᏗᏢ ᎦᏙᎯ ᎠᎴ ᎠᏍᏓᏯ ᏅᏯ ᎠᏆᏤᎵ ᎠᎴ ᎤᏠᏱᎭ ᎾᎾᎢ ᎠᏂᎦᏲᎵ 3 g/1000 kg (3 ppm) ᎾᎿ ᎢᎦᏘᎭ ᎢᎬᏁᎸ. ᏭᏚᎸᏛ ᏗᎬᏙᏗ ᏓᏲᏓᏅ 30 g/1000 kg (30 ppm) ᎠᎴ ᎤᏠᏱᎭ ᎤᏚᎳᏗ ᏄᎵᏍᏔᏅ ᎤᏓᎷᎸ ᎠᏕᎸ ᏓᎶᏂᎨ ᎨᏒᎢ ᎬᎪᏩᏛᏗ ᎯᎠ ᎤᏰᎸᎭ ᎠᎦᏙᎵ, ᎾᏍᎩ ᎢᎬᏂᏏᏍᎩ ᎭᏫᎾᏗᏢ ᎤᎪᏗᏗ ᎠᏕᎸ ᏓᎶᏂᎨ ᎠᏆᏤᎵ ᏂᎯ ᏫᎵ ᎾᏍᎩ ᏂᎨᏒᎾ ᎠᎪᏩᏛᏗ ᏂᎦᎵᏍᏗᏍᎬᎫ ᎠᏕᎸ ᏓᎶᏂᎨ.