Mulofwe IOCG (ZRL) - Zambian Copperbelt (sitios de interés)

 

 

 

History: 

Mineralisation in the Mulofwe Dome area was first documented in 1912 with the discovery of the Pala-Darg bismuth prospect. Between 1914 and 1934, 4.7t of bismuth was mined from the prospect at average grades between 2.63% and 4% Bi and up to 3oz/t Au. During this time other prospects within the dome, including Kyembe, Kaunga, Shapola, Somerset and Devonshire, were assessed although no record of this work is currently available.

Limited exploration by Charteredex during the early 1960’s resulted in an estimation of remaining “ore reserves” at Pala-Darg of 357t averaging 2.63% Bi. No gold exploration appears to have been conducted.

Between 1983 and 1985, rock chip sampling by Zimco Limited returned grades up to 50g/t Au from the Kaunga Prospect; 50g/t Au and 10,000ppm combined copper, tungsten and bismuth at the Kyebwe Prospect; 7g/t to 15g/t Au associated with anomalous copper, nickel and bismuth at Pala-Darg, 4g/t to 20g/t Au from the Shapola Prospects; and 10g/t Au and 8,000ppm Cu from Devonshire.Ground based magnetic, radiometric and electrical geophysical surveys were completed at Kyebwe, Darg and Kaunga 1 with limited effectiveness. Trenching and pitting at various prospects returned grades up to 0.5m averaging 15g/t Au at Kaunga 1, 0.3m averaging 8.75g/t Au at Devonshire and 0.5m averaging 22.5g/t Au at Pala-Darg.

Systematic rock chip sampling of veins illustrated a positive correlation between tungsten, gold, copper and niobium mineralisation with maximum values greater than 10,000ppm tungsten, 3.25ppm gold, 1000ppm to 2000ppm copper and approximately 1000ppm niobium. An 11 hole drill programme to test the ‘A’ tungsten anomaly returned negative results, however no gold analyses are reported. No further exploration is documented.