MLN 13 Annual report 1 July 1990 to 30 June 1991

Abstract

During the reporting period, a total of 2,065,055 BCM of material was mined consisting of 336,573 BCM ore giving a stripping ratio of 5.14:1. A total of 890,021 tonnes of material averaging 3.48 grams per tonne Au was treated in the CIP circuit extracting 2415.7 kg Au and 488.9 kg Ag bullion. An average recovery of 77.9 percent. Heap leaching saw 225 897 tonnes crushed and stacked yielding 150.1 kg Au. A drilling programme was undertaken over Cox's, Henry George (previously referred to as the Kohinoor fault) and Battery Shear. No exploration work was conducted on the Czarina, Enterprise and Kohinoor during the reporting period. Although the results from Henry George were disappointing, at Cox's results were encouraging enough to justify infill drilling. Cox's area lies entirely on the western limb of the Kohinoor anticline. Surface mapping and diamond drilling revealed the existence of a large fault similar to other structures identified at Czarina and Enterprise. A zone of continuous mineralisation at +0.5 grams per tonne Au appears to be closely associated with the fault and quartz veinning relating to it. The mineralisation is open to the east and south. Drilling at battery Shear covered a zone of extensive old workings. Discontinuous mineralisation was intersected along the entire zone. The Battery Shear is thought to be another major westerly dipping fault, which transects the Enterprise syncline. Mineralisation appears to be associated with easterly quartz veining developed on the footwall of the fault. A manual resource estimate based on cross-sections is for oxide material only, 170,000 t at 1.30 grams per tonne Au using a 0.5 grams per tonne cut-off.