Botswana – A total of 274.33 carats were recovered from the processing of 5 916 t of BK02 for a sample grade of 4.6 cpht.
The largest diamond recovered was a 5.48 carat brownish octahedron (as seen right). In addition, a total of 24 stones were recovered greater than 1 carat in weight including three diamonds in excess of 2 carats – 5.48ct, 2.26ct, and 2.03ct.
Sample results confirm that the BK02 kimberlite has a coarse size distribution similar to that observed at Lucara’s Karowe mine. A limited drill programme is planned for BK02 to better delineate the kimberlite, define internal geology and collect material for microdiamond analyses.
The sample was collected by excavator and trucked to the Karowe mine where processing was conducted through a 15 tph custom built Bulk Sample Plant (BSP).
Final diamond recovery from DMS concentrate was completed at the BSP using conventional X-Ray luminescence technology. Diamonds were exported to the Lucara Sales and Sorting office in Gaborone for final cleaning and sizing.
At the Karowe Mine, drilling has commenced on a 10 000 m programme to test the inferred resource below 400 m within the prolific South Lobe of the AK06 kimberlite. Results of the drill programme and other activities will be utilised in an updated resource estimation for the Karowe mine.
William Lamb, President and CEO, commented, “The results from the completion of the first bulk sample of the BK02 kimberlite are very encouraging and an important milestone for Lucara. The completion of this sample together with the on-going exploration of the prospecting licenses and the commencement of the deep drilling on the south lobe opens up the opportunities for Lucara to fulfill its commitment to the expansion of our resource base in the Orapa District of Botswana.”
At the AK12 kimberlite, surface trenching and sample collection is complete and an estimated 6 000 t have been stockpiled at the BSP. Treatment of the sample is on-going. Results will be released once the full sample has been treated.
Additional gravity and magnetic data has been collected at AK11, AK13 and AK14. The Botswana Department of Environmental Affairs has issued the necessary approvals for Lucara to proceed with additional surface sampling and drill programmes. Drill programmes at AK11, AK13, AK14 will be based on a review of the geophysical data and are planned to commence in early Q3, 2016.