( ( ( ( Ores and ) metals ) 20,000 ) ; )
(ROOT (NP (NP (NP (NNS Ores) (CC and) (NNS metals)) (NP (CD 20,000))) (: ;)))
Ores and metals 20,000;
(ROOT (S (NP (NNS Metals)) (VP (VBP start) (PRT (RP out)) (PP (IN as) (NP (NN ore)))) (. .)))
Metals start out as ore.