Manganese ore inquiry to port of Douala, any other African port

We need to buy manganese ore.
Order: 20,000 tonnes per month (initially).
Packaging: 1000 kg bags.
Contract: 12 months renewable
MnO2 content: 35% TO 40%
Delivery Port: port of Douala or other African port.
Inspection: Quality and Quantity Certificate issued by SGS or equivalent
Specifications:
Physical specifications: size 0-8 mm, 90% minimum)
FE: 7-10% (typical)
SIO: 16-20% (typical)
A1203: 7-10%
P: 0.10% maximum.
Looking forward to your offers.