The ideal treatment for hemothorax greater than 500 ml/hour -
Following are indications of thoracotomy in blunt chest trauma:

Initial drainage of blood > 1000 ml, especially if fresh.
Continued brisk bleeding > (100 ml/15 minutes) from the intercostal drain
Continued bleeding of > 200 ml/hr for > 3 hrs
Rupture of bronchus, aorta, esophagus or diaphragm
Cardiac tamponade (if needle aspiration unsuccessful).
Wait and watch
Needle aspiration
Intercostal tube
Open thoracotomy with ligation of vessels
Open thoracotomy with ligation of vessels