High-Grade Zinc &
Lead Concentrates.
Polymetallic Smelter Feedstocks
Because zinc and lead are geologically symbiotic, they are co-extracted and separated via advanced differential froth flotation. HUTKA SA secures and distributes both premium Zinc (Sphalerite) and Lead (Galena) concentrates from Tier-1 mining jurisdictions across the Americas.
Our concentrates serve as the primary raw material for custom smelters worldwide. We deliver highly consistent product lots with optimized moisture levels, tightly controlled penalty elements, and highly lucrative precious metal credits (particularly Silver/Ag in our lead concentrates) to maximize smelter margins.
Assay & Element Profiles
Final settlement assays for payable metals (Zn, Pb, Ag, Au) and deductions for penalty elements are determined based on mutual agreement or umpire laboratory results (e.g., AHK / Alex Stewart). Below are nominal specification ranges.
| Zinc Concentrate (Zn) Profile | |
|---|---|
| Zinc (Zn) Base | 45.0% – 55.0% |
| Silver (Ag) Credits | Variable (Typically 50 – 150 g/t) |
| Iron (Fe) Penalty | 8.0% Threshold |
| Silica (SiO2) Penalty | 3.5% Threshold |
| Moisture (H2O) | 8.0% Max. |
| Lead Concentrate (Pb) Profile | |
|---|---|
| Lead (Pb) Base | 50.0% – 65.0% |
| Silver (Ag) Credits | High (Typically 500 – 2,500+ g/t) |
| Bismuth (Bi) Penalty | 0.05% Threshold |
| Arsenic (As) Penalty | 0.50% Threshold |
| Moisture (H2O) | 8.0% Max. |
Safe Handling & IMSBC Compliance
Managing moisture in heavy concentrates is a critical safety parameter to prevent cargo liquefaction and vessel destabilization during ocean transit.
HUTKA SA operates covered, well-ventilated stockpile facilities at export terminals. Our logistics teams actively manage stockpile turnover and utilize moisture-reduction processes to ensure all shipments fall safely below the Transportable Moisture Limit (TML) set by the International Maritime Solid Bulk Cargoes (IMSBC) code.
Responsible Mining & Tailings Management
HUTKA SA partners exclusively with mines that adhere to strict ESG protocols, including the Global Industry Standard on Tailings Management (GISTM). We ensure our upstream sources utilize closed-loop water systems to minimize environmental impact, prioritize occupational health & safety regarding lead exposure, and are 100% free of conflict-zone origins.
Bulk Logistics & Export Protocols
Prior to loading, BQCIS draws composite samples to certify the Transportable Moisture Limit (TML) and Flow Moisture Point (FMP), ensuring absolute bulk vessel safety.
Loading Formats
Depending on buyer volume, concentrates are loaded loose into Bulk Carrier holds via covered conveyor systems, or packaged into 2MT Jumbo Bags (FIBCs) for containerized freight.
Draft Survey (Weight)
For bulk ocean freight, final wet metric tonnage (WMT) is determined by an independent Marine Draft Survey conducted by BQCIS alongside the ship’s Master prior to departure.
Umpire Sampling
Representative samples are sealed and retained. In the event of an assay discrepancy between loading and discharge ports, samples are sent to an agreed umpire laboratory.
Standard Commercial Documentation
Every shipment is cleared for international customs with a comprehensive, fully compliant document packet dispatched via express courier to the buyer’s bank or office.
- Provisional Commercial Invoice
- Draft Survey Report (Bulk Weight)
- Full Set Clean on Board Bill of Lading (B/L)
- Certificate of Origin
- BQCIS Certificate of Assay (Provisional)
- BQCIS Transportable Moisture Limit (TML) Certificate
- BQCIS Moisture Declaration
- Insurance Policy / Certificate (If CIF)
- Export Declaration Forms