King's Daughter Mining Company

Redwing Mine is owned and operated by King's Daughter Mining Company Limited. Redwing Mine resumed production in 2015 following dewatering.

Redwing Mine is located in Manicaland province in the east of Zimbabwe, about 20 kilometres northeast of the city of Mutare and 265 kilometres southeast of Harare.

Geology

At Redwing Mine two main orebodies, the felsite and quartz, are where mining has taken place. The felsite orebodies range in thickness from 2 to 15 metres (averaging 5 metres) and are shallow dipping. Gold mineralisation is generally disseminated and grades are approximately 2 to 3g/t. The quartz orebodies are generally narrow (<2.5 metres) and steeply dipping and generally average 6 to 7g/t, although locally have very high grades (>50g/t). Gold mineralisation is associated with sulphide mineralisation comprising pyrite, galena, chalcopyrite, minor arsenopyrite and sporadic native gold. Silver occurs with the gold and represents some 50% of gold content.

A Felsite orebody sitting shallower than 200m from surface was defined in 2013; this zone lies between the Bromley and King’s Daughter Faults and contains in excess of 3.5Mt grading between 2.50 and 3.50g/t from widely spaced historical drillholes.

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Mining and processing

This is another historic mining district with mining dating back to 1889. Production in the area was consolidated into one entity in 1896 and between 1966 and 2004, more than 1.1 million ounces of gold were produced here. The mine was flooded in recent years and is currently being dewatered. In 2014, there was stop-gap production from sands retreatment of only 104 ounces.

Redwing Mine is a combined underground and sand/slime retreatment operation, with one processing plant dedicated to underground operations and another to surface sand operations. The former uses a combination of conventional milling, gravity concentration, Merril Crowe and carbon-in pulp to process the ore. The latter uses a combination of conventional milling, leaching, carbon-in-leach and elution circuits.

Mining resumed in November 2015 from top levels of underground. Production in 2016 was 10,106 ounces. The mine is expected to ramp up from the current 15,000tpm to a plant capacity of 22,000tpm by Q3 2017.

  • Current resource: 2.5 million ounces of gold (Mineral Reserve Statement Dec 2016)
  • Life-of-mine: 20 years

With a programme in place to ramp up production that began in 2016, Redwing Mine has strong potential to contribute significantly to Group output. 

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Exploration prospects

Recent structural modelling to 1000 metre depth and over a 1500 metre-wide swath has defined a Conceptual Target of between 5 to 8 million ounces of gold, at average 5g/t, in multiple quartz veins within north-dipping, reverse-shears that cut the host Penhalonga diorite.

The Geological Survey Bulletin No 32 of 1964 records production from one such quartz vein, the Rezende Reef, of 840,000ozs from 1.9million tonnes at recoverable grade of 14g/t.