ASX-listed Orion Minerals has reported Mineral Resource estimates for three additional, near surface deposits that form part of the Okiep Copper Project (OCP) in the Northern Cape Province of South Africa.
Orion is currently undertaking due diligence work at Okiep and the company has estimated Inferred Mineral Resources at the Flat Mine (Nababeep), Jan Coetzee Mine and Nababeep Kloof Mine deposits for a total of 2.5 million tonnes grading at 1.4% copper for 35 000 tonnes (t) of contained copper.
Together with the previously reported Mineral Resources for the Flat Mine North, Flat Mine East and Flat Mine South deposits, these latest resource estimates increase the total Mineral Resource at Okiep to 11.5 million tonnes grading 1.4% copper for 159 000 tonnes of contained copper.
The Mineral Resource estimations are based on historical drilling data and classified in accordance with the 2012 Edition of the Australian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (JORC code 2012).
The Okiep copper deposits are orogenic type copper deposits hosted in mafic to ultra-mafic intrusive bodies in the western part of the Namaqua Complex, South Africa. Mines in the Okiep district produced 105.6 Million tonnes (Mt) at 1.71% copper (Cu) since the 190’s. Copper deposits are hosted by easterly-trending mafic/ultramafic dykes and sills. Some 1700 of these intrusions occur in the district.
A structural control on intrusives in the form of ‘steep structures’ monoclinal folds is well established. Copper mineralisation occurs as disseminations of chalcopyrite and bornite with local massive sulphide concentrations within and adjoining mafic intrusive bodies.
The intermediate and basic mineralised rocks are structurally controlled with pinching and swelling a common feature, in both strike and dip. A strong correlation is recognised between high-grade massive ore and at least three favourable lithological target horizons, with high grade blows forming where the dykes cut these three specific lithologies:
- Springbok Quartzite and Schist;
- Mixed Zone or Wolfram Schist; and
- Ratelpoort Quartzite and Schist.