There has been some concern on other boards regarding the low recovery rates in the past from the tin-indium zone (North zone - 1996 development). I suspect that this is being adressed by the company at the moment.
However, of more immediate importance is the old (early 1980's) work on the company's Fire Tower Zone which:
The property’s Fire Tower Zone contains a 43-101-compliant inferred resource of 13,074,438 tonnes at 0.35% tungsten oxide (WO3) and 0.21% molybdenum disulphide (MoS2)This zone is different metallurgically and sustained the 1980-84 production of Billiton. It is most likely to be where production will restart first with good recoveries. In fact, an estimate of Adex's from the mid 1990's suggests that at least $25,000,000 worth of this Billiton-mined ore is sitting adjacent to the mill buildings awaiting processing. A nice sweetner to help in starting up the operation - no mining costs here.