( ( ( and ( metal ( ore mining ) ) ) ( -LRB- ( ( 20 % ) -RRB- ) ) ) . )
(ROOT (NP (NP (NNP and) (NN metal) (NN ore) (NN mining)) (PRN (-LRB- -LRB-) (NP (CD 20) (NN %)) (-RRB- -RRB-)) (. .)))
and metal ore mining (20%).
(ROOT (S (NP (NNS Metals)) (VP (VBP start) (PRT (RP out)) (PP (IN as) (NP (NN ore)))) (. .)))
Metals start out as ore.