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  1. 69 Posts.
    I found this on the aar website:


    Q. Why is there so much emphasis on the Koongie Metallurgy?

    A. It is not sufficient to have a defined resource. Metallurgy along with orebody shape and geotechnical issues will determine which parts of the resource can be mined. Utimately this affects mine planning. Metallurgical results also affect the the design of the plant.

    Metallugy ultimately determines the final concentrate product. Our testwork has determined that both sulphide concentrates from Onedin and Sandiego could be considered to be “clean” and that, where some deleterious elements were present, the amounts were only slightly above the levels at which penalties might be imposed by smelters.

    Q. Why has the metallurgical testwork taken longer than expected?

    A. All massive sulphide deposits have complex metallurgy and are unique metallurgically. The basic flotation methodologies employed on all sulphide ores are similar however the details of crushing methodology, grind size, added chemicals and residence times are very sensitive to variations in the ore type. Therefore optimisation of the metallurgy has required a large number of tests. We also have a number of different ore types which requires different metallugical treatment to acheive optimal recovery.

    Another factor for the slow metallurgy has been the slow turn around time by assay laboratories. Assay laboratories have been placed under enourmous preassure due to a substantial increase in exploration Australia wide. Our metallurgical testwork has been sequential. Results of the previous tests have determined the direction of subsequent tests.

    Q. Why has there been no information released on the Pre- Feasibility?

    A. Metallurgy impacts all aspects of the pre-feasibility study. Hence the pace of the metallurgical testwork partly dictates the pace of the Pre-Feasibility. However the company has released some information about the prefesibility work:

    JORC Code resources announced. Potential to increase resouces.
    Preliminary assessment focussing on Mining Onedin by open cut and Sandiego by underground methodologies concluded that at current prices mining at Koongie could provide attractive returns
    Stand alone milling options examined as well as toll treatment at nearby plants.
    Production 500,000tpa producing 60,000t of zinc and copper concentrates. Batch treatment of various ore types.
    Transport of concentrates through Wyndham
    Initial studies focused on mining sulphide only. Testwork from Sandiego transition ore is positive
    Bill Holly continues to manage pre-feasibility work

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