It was a savage competition which forced him to economize, the more so since the great depth of Jean-Bart increased the price of extraction, an unfavourable condition hardly compensated by the great thickness of the coal-beds.
C'était une concurrence sauvage, qui le forçait aux économies, d'autant plus que la grande profondeur de Jean-Bart augmentait chez lui le prix de l'extraction, condition défavorable a peine compensée par la forte épaisseur des couches de houille.