( ( ( ( ( ( Uranium ores ) ( typically ( contain ( ( only ( a ( small amount ) ) ) ( of ( uranium-bearing minerals ) ) ) ) ) ) , ) so ) ( ( initial ( extraction ( and ( concentration steps ) ) ) ) ( are required ) ) ) . )
(ROOT (S (S (NP (JJ Uranium) (NNS ores)) (ADVP (RB typically)) (VP (VBP contain) (NP (NP (RB only) (DT a) (JJ small) (NN amount)) (PP (IN of) (NP (JJ uranium-bearing) (NNS minerals)))))) (, ,) (IN so) (S (NP (JJ initial) (NN extraction) (CC and) (NN concentration) (NNS steps)) (VP (VBP are) (VP (VBN required)))) (. .)))
Uranium ores typically contain only a small amount of uranium-bearing minerals, so initial extraction and concentration steps are required.
(ROOT (S (NP (JJ Ores) (NN rock)) (VP (VBZ contains) (NP (NP (NNS concentrations)) (PP (IN of) (NP (JJ valuable) (NNS minerals))))) (. .)))