Interested in Zinc concentrates 35%

We are looking for Zinc concentrate as follows:

Zinc Concentrates.
Quantity: The trial order is 250 MT, First Shipment is 1000 MT.
After Shipment. Subsequent
Monthly shipment Quantity shall gradually Increase as
Per the Seller's Ability to provide as following Indication: 2500 MT,

5000 MT, Then 12500 MT, 25000 MT Per Boat Shipments. The Seller shall notify Buyer The quantity every Month. The Supply quantity, Buyer and Seller Can be Negotiated Again
Price : Zinc Concentrate: Zn Content 35% USD xx/DMT. CIF Xiamen Port China
Less Than Zinc Content 32%Rejected.
Loading Port:
Payment: Documentary Credit. 100% Irrevocable, Non-Transferable, Non-dividable Documentary Letter of Credit at sight.
Inspection: Inspection by SGS/CCIC at the Loading port by The Seller. The Seller is responsible for the expenses. The same inspection agency shall perform the inspection by CIQ/CCIC at Destination port by the buyer cost by buyer.
P.Bond: Within 7days receipt of 2% PB (Performance Bond ) from the Seller's Bank, The Buyer's Bank will issue a 100% Documentary Letter of Credit
Contract Duration: 12 months will rolls and extension