Stibnite Antimony Concentrate (Sb₂S₃, 45–60% Sb)

Antimony sulphide flotation concentrate (HS 2617.10) priced on payable Sb minus TC and penalty elements

Stibnite flotation concentrate (antimonite, Sb₂S₃, HS 2617.10) is the principal upstream raw material for primary antimony metal and trioxide production. Pure stibnite mineral contains 71.68% Sb and 28.32% S; commercial flotation concentrates typically assay between 45.0% and 60.0% contained antimony (delivered as a dense, moist, grey-black fine sand with 80% passing 74 microns / 200 mesh), supplemented by hand-sorted lump "antimony crude" at 50% to 60% Sb.

Unlike refined metal, stibnite concentrate is never sold per gross tonne. It is settled against commercial payable formulas based on contained dry metric tonnes (DMT) of metal: Commercial Value ($/DMT) = [Base Metal Price × (Payable % / 100) × Contained Sb] + Precious Metal Credits - Treatment Charge (TC) - Impurity Penalties. The payable rate scales with head grade: 72.0% to 76.0% for Sb ≥ 55.0%, 68.0% to 72.0% for Sb 50.0%–54.9%, and 64.0% to 68.0% for Sb 45.0%–49.9% (or via a standard 4.0 to 5.0 unit deduction). Treatment charges (TC) are negotiated per DMT of dry concentrate, benchmarked against Fastmarkets Rotterdam or SMM 99.65% metal quotations. Gold is credited above 1.0 g/DMT at 80%–90% of LBMA PM Fix minus refining deductions ($6.00–$10.00/oz), and silver is credited above 30.0 g/DMT. Smelters enforce strict penalty escalations: Arsenic (free tolerance ≤ 0.30%, penalised at $3.50 per 0.10% over, outright reject > 1.50%), Lead (free ≤ 0.20%, reject > 1.00%), Mercury (free ≤ 50 ppm, reject > 200 ppm due to acid plant catalyst poisoning), Bismuth (free ≤ 0.05%, reject > 0.20%), and Selenium (free ≤ 50 ppm).

Crucially, stibnite flotation concentrate is classified under the IMO IMSBC Code as a Group A Cargo (cargoes that may liquefy if shipped at a moisture content exceeding their Transportable Moisture Limit [TML]). Consignments must undergo Flow Moisture Point (FMP) and TML testing within 7 days of loading, with moisture strictly controlled ≤ 8.0% (reject > 12.0%). To bypass Chinese MOFCOM dual-use export restrictions, CBIL mobilizes stibnite concentrates from verified non-Chinese producers: Tajikistan (Anzob complex / Jidjikrut deposit) evacuated via the Trans-Caspian International Transport Route (TITR / Middle Corridor) across the Caspian and Black Seas to Poti; Bolivian Altiplano cooperatives via Chilean ports (Arica and Antofagasta); and Turkish mines via Samsun. Shipments move in 1,000 kg UV-stabilized FIBC big bags with polyethylene liners stuffed 20–25 MT per 20ft container, or as Handysize bulk parcels with certified TML, moisture, and chemical assays.

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Excluded origins are not offered, including product re-exported, blended or re-processed through a third country. Every lot moves with a certificate of origin naming the producing plant, mine or grower country, and nothing is quoted before the seller and loading point are known.