). ▁It ▁is ▁a ▁joint ▁vent ure ▁of ▁Al co a , ▁Rio ▁T into , ▁and ▁D ado ▁M ining ▁holding ▁a ▁ 5 1 % ▁share , ▁and ▁the ▁Gu ine an ▁government ▁holding ▁a ▁ 4 9 % ▁share . ▁Its ▁exports ▁of ▁b aux ite ▁are ▁the ▁largest ▁in ▁the ▁world , ▁reported ly ▁in ▁excess ▁of ▁ 1 3 . 5 ▁million ▁t onnes ▁in ▁ 2 0 0 8 . ▁ ▁Guinea ▁has ▁large ▁res erves ▁of ▁iron ▁ore ▁with ▁high ▁potential ▁for ▁extra ction . ▁These ▁largely ▁remains ▁un t apped , ▁and ▁its ▁quality ▁grade ▁is ▁more ▁than ▁ 6 0 %. ▁Rio ▁T into ' s ▁joint ▁sector ▁enter prise ▁in ▁the ▁iron ▁ore ▁sector ▁is ▁the ▁Sim and ou ▁mine ▁project , ▁with ▁a ▁value ▁estimated ▁at ▁$ 6 ▁billion . ▁In ▁ 2 0 1 2 , ▁Sim and ou ▁mine ▁was ▁project ed ▁to ▁produce ▁ 9 0 ▁million ▁tons ▁of ▁iron ▁ore ▁ann ually . ▁The ▁Mount ▁N im ba ▁mine , ▁also ▁in ▁the ▁iron ▁ore ▁sector , ▁is ▁located ▁in ▁the ▁N z ér ék or é ▁Region , ▁while ▁the ▁Kal ia ▁mine ▁is ▁in ▁the ▁Far an ah ▁Region . ▁ ▁Diam ond ▁potential ▁is ▁estimated ▁at ▁ 4 0 ▁million ▁car ats . ▁In ▁ 2 0 1 2 , ▁production ▁was ▁ 2 6 6 , 8 0 0 ▁car ats ▁as ▁per ▁the ▁Kim ber ley ▁Process ▁Cert ification ▁Sch eme , ▁and