A method and system (10) for transporting rock material (20) such as drill muck in a conveying conduit by means of an airflow, the system comprising a conveying conduit (11) having an inlet end (12) for receiving rock material to be transported and an outlet end (13); a suction device (14) for creating an airflow, which suction device is arranged in connection to the outlet end (13) of the conveying conduit (11); and an extraction unit (15) for extracting rock material (20) that has been transported in the conveying conduit (11), the extraction unit being arranged in fluid connection to the outlet end (13). The system further comprises a feed controller (16) for controlling the provision of rock material (20) to the inlet end (12) of the conveying conduit (11), wherein a sensor (17) is arranged to monitor the airflow in the conveying conduit, and that a control unit (18) is arranged to in response to the monitored airflow in the conveying conduit produce a command to control the provision of rock material (20
