An improved gas extraction model during stepwise crushing ...
· The ore mineral cassiterite and gangue mineral quartz from the two orebearing quartz vein samples were selected for gas compositional analysis using an SRS© RGA200® quadrupole mass spectrometer which was coupled with an inhouse designed stepwise crushing system (Qiu and Wijbrans, 2006, Qiu and Jiang, 2007, Qiu et al., 2011) at the State Key .