Report Zn separately from other elements
Provide Zn and available Pb, Fe, S or other results. A combined metal content cannot substitute for the Zn content of an individual zinc concentrate.
RTV MINERAL PROCUREMENT · SOUTHEAST ASIA → CHINA
Zinc Concentrate Procurement
Buying Zinc concentrate from Southeast Asia with Zn ＞30% for supply to China.
Zinc concentrate is assessed by its Zn content. Both oxide and sulphide types may be submitted. Describe the processing, moisture and available impurity assays so delivery can be discussed for the actual lot.
Send existing assays and site photos, even if some records are still missing. Quantity, price, inspection and settlement milestones are discussed for each lot.
These are RTV's commercial screening thresholds. Acceptance also depends on material classification, harmful elements, source and suitability for import into China. Meeting a grade threshold does not constitute import clearance or a purchase agreement.
WHAT WE BUY
What to confirm for Zinc concentrate
State oxide or sulphide type
Describe mineral type, concentration method and any further treatment. Even materials with the same name require checks of source, composition and form.
Specify moisture, packing and quantity
Distinguish wet tonnes, dry tonnes and estimates. Keep the assay basis as reported. State bulk or bagged packing and distinguish current stock from planned output.
Check impurities and the receiving route
Provide available As, Cd, Hg, Tl and other impurity results. Further procurement arrangements depend on classification, documents and the proposed delivery point.
Photos illustrate concentrate appearance only. They do not establish grade, stock availability, origin or the quality of a particular lot.
Have Lead concentrate or mixed material?View all buying requirements →
SEPARATE Pb AND Zn RESULTS · COMBINED ASSESSMENT
Mixed lead-zinc material Pb＋Zn ＞40%
Mixed material is assessed by combined Pb and Zn content. Report Pb and Zn separately, rather than only a total. Include oxide or sulphide type, processing, moisture and cargo location.
REGIONAL COVERAGE & DELIVERY
Southeast Asian supply, receiving in China
These are delivery nodes open for discussion. Agree the specific terminal, border point, transport mode and responsibilities for each lot.
SourceSoutheast AsiaMine owners · Plants · Cargo owners · Authorised traders
Delivery optionsShipment port / Land borderAgree port FOB and land delivery separately
Receiving in ChinaQinzhou · Fangcheng · NanshaOther locations: arrival transactions preferred
FOB at shipment port
Laem Chabang · Hai Phong · Agreed Ho Chi Minh City terminal
Port FOB can be discussed with the named port, loading point, export procedures and shipment arrangements specified. The terminal, transport arrangements and responsibilities must be agreed.
Land-border delivery
Boten, Laos · Agreed Vietnam border point
Confirm the precise delivery point, current cargo location, inland transport and customs responsibilities. Land delivery is agreed separately and is not described as maritime FOB.
Transaction upon arrival in China
Qinzhou · Fangcheng · Nansha
For other cargo locations, transactions upon arrival in China are preferred for discussion. The contract must specify inspection, settlement and title-transfer milestones; arrival alone does not determine them.
- Thailand
- Shipment-port transactions at Laem Chabang can be discussed.
- Vietnam
- Discuss Hai Phong, an agreed Ho Chi Minh City terminal or an agreed land-border point.
- Laos
- Discuss an agreed delivery point at Boten.
- Other Southeast Asian sources
- Assess cargo location and documents, preferably discussing a transaction upon arrival in China.
These locations describe possible delivery routes, not RTV-owned warehouses or permanent offices at every point. Import suitability, export arrangements and documents remain subject to lot-specific checks.
FROM RECORDS TO DELIVERY
Check composition, cargo title and delivery terms
Composition and lot review
Check Pb, Zn, associated elements, moisture and report date, and whether assays, photos and available quantity relate to the same lot.
Source and cargo-title checks
Establish the supplier's role and authority to arrange inspection, sampling, contract signing and delivery.
Sampling and assay coordination
Agree the sampling scope, sample sealing, third-party assays and re-assay arrangements for each lot, using mutually accepted testing evidence.
Coordination for delivery to China
Connect supply with Chinese market demand and confirm the named location, transport and document responsibilities, inspection basis and settlement milestones for each lot.
Submit available cargo information
Send material, location, composition, quantity and contact details. Upload existing reports and photos if available.
Review lot and acceptance conditions
Check supplier role, assay records, material classification and proposed route; identify missing information.
Agree verification and trade milestones
Confirm inspection, sampling, testing, delivery point, cost responsibilities, contract and settlement basis.
Execute the agreed delivery
Proceed with the confirmed lot and conditions, keeping corresponding cargo, assay and handover records.
FIRST CONTACT
Send what you have, then complete verification
Link assays and photos to the offered lot. Label current stock, historical samples and planned production separately.
- Material and type
- Lead concentrate, zinc concentrate or mixed material; oxide, sulphide or unverified.
- Cargo location
- Country, region and whether the cargo is currently at a mine, processing plant, warehouse or another location.
- Composition and moisture
- List Pb and Zn separately, with available impurity and moisture results and assay basis.
- Quantity and supply schedule
- Available quantity and unit; distinguish current stock, planned production and continuing supply.
- Your role and delivery proposal
- Explain your relationship to the cargo owner and proposed shipment port, land-border point or arrival route.
SUPPLIER FAQ
Clarify these points before quoting
Does Zn of exactly 30% meet the published threshold?
The published screening threshold is Zn >30%. Provide the actual result and assay basis without rounding a borderline value upwards.
How should zinc material with substantial lead be submitted?
Report Pb and Zn separately and identify the material type. Mixed lead-zinc material can be submitted through the mixed-material entry, with a screening threshold of Pb+Zn >40%.
Can both oxide and sulphide materials be offered?
Both may be submitted for assessment. State the actual mineral type, processing, composition and impurities. The mineral name alone does not determine acceptance.
Does meeting the grade threshold guarantee import or purchase?
No. Acceptance depends on material classification, harmful elements, source, documents and import suitability. Price and trade conditions must be agreed by both parties.
Can I contact RTV before a full assay report is available?
Yes. Send the composition information, quantity, location and photos you have, and state what is missing. Required verification is then completed for the actual lot before procurement.
What are the minimum quantity and payment terms?
State the lot quantity and supply plan first. Quantity, price, inspection, payment and title-transfer milestones are negotiated for the actual lot and contract. No uniform terms are promised on this page.
OFFER MATERIAL TO RTV
Send information about the actual lot
Start with material, location, known composition and quantity. Testing, delivery and trade terms are then discussed for that lot.
Ready-to-copy offer format
Material: Zinc concentrate Type: Oxide / Sulphide / Unverified Cargo location (country, region, storage point): Pb (%): Zn (%): Other known elements, moisture and assay basis: Available quantity, unit and future supply plan: My role and relationship to the cargo owner: Proposed delivery point or route: Existing assays, lot identification and site photos: Contact details:
ADDITIONAL REFERENCE
Reference standards and buying thresholds differ
The figures below are extracts from existing reference standards. They are not RTV's minimum buying grades on this page and do not replace import assessment for a specific lot.
Numerical specification reference
GB/T 20424—2025 · Composition values: mass %
Content conditions in the standard definition (extract)
Zn ≥ 40
| Parameter | Reference value |
|---|---|
| As | ≤ 0.50 |
| Cd | ≤ 0.30 |
| Hg | ≤ 0.06 |
| Tl | ≤ 0.02 |
For comparing lots and discussing specifications and pricing, not a universal RTV supply threshold.
Content conditions are not the complete definition or RTV purchasing minimums. Check source, beneficiation and physical form for applicability. Do not directly apply this table to ore, slag, dust or recycled material.