Purchasing copper concentrate to Africa

We are looking for a supplier of copper concentrate to Africa.
Specifications: grade A, 99.99%.
We are purchasing on a long-term basis. Our interest is to begin with an initial trial shipment of approximately 800 MT, followed by a monthly supply of at least 1,000 MT, subject to successful trial performance.
Delivery would be made into bonded warehouses in Southern or East Africa (including Zambia, Tanzania, South Africa, or Mozambique), with inspection by SGS or an equivalent international inspector. Payment would be made upon delivery and inspection confirmation. No advance payment is required.