( ( ( Rocks and ) ( ore minerals ) ) . )
(ROOT (NP (NP (NP (NNS Rocks)) (CC and) (NP (NN ore) (NNS minerals))) (. .)))
Rocks and ore minerals.
(ROOT (S (NP (JJ Ores) (NN rock)) (VP (VBZ contains) (NP (NP (NNS concentrations)) (PP (IN of) (NP (JJ valuable) (NNS minerals))))) (. .)))