By my understanding it is one deposit type...the source of all the volcanic activity was a failed continental rift(Aulocogene) about 1.1 billion years ago...and that is the driver for all the deposits associated with the Duluth Complex...what may be different at the two locations is the mechanism for deposition of the metals...sulphur inclusion in the melt at Maturi are and hopefully something else at the vent..?...think Dr Petersen also mentioned that he thought flow restrictions within the magma may be a mechanism?...time and drilling will it a week now??