組合の推定によると、２００６から２００７年にほぼ２５０人の鉱夫が事故で死んだ。
(S (S (PP (NP (PP (BASENP (NN 組合)) (IN の)) (NN 推定)) (INP (IN に) (VB よる) (INCON と))) (COMMA 、) (S (PP (PP (BASENP (NN ２００６)) (IN から)) (PP (BASENP (NN ２００７) (NN 年)) (IN に))) (S (PP-SBJ (NP (PP (BASENP (QP (RB ほぼ) (NN ２５０)) (NN 人)) (IN の)) (NN 鉱夫)) (IN が)) (VP (PP (BASENP (NN 事故)) (IN で)) (VP (VBV 死ん) (VP (MD だ))))))) (PERIOD 。))