Lake Victoria Gold Fields • Factory Direct
Activated Carbon for Tanzania Gold Mines — Preg-Robbing Ore Solutions
High-activity, ultra-hard coconut shell activated carbon for Tanzania’s Lake Victoria greenstone CIL plants. Built to out-compete preg-robbing carbonaceous ore — TOM diagnosis to carbon selection to blanking strategy.
- ✓ Iodine ≥1050 · Hardness >98.5% · beats preg-robbing ore
- ✓ Full preg-robbing mitigation: diagnosis + carbon + blanking
- ✓ Ships to Dar es Salaam · 22–30 days sea · 5-ton trials
Recommended Grades for Tanzania Mines
The three grades most requested by Tanzania’s gold operations. See full specifications, mesh options, and technical data on each product page, then request a quote or TDS for your circuit.
Gold Recovery Activated Carbon
6×12 mesh · hardness >98.5% · gold loading >30 mg/g
Our flagship CIL grade — high iodine and >98.5% hardness give it the activity to out-compete preg-robbing organics common in Lake Victoria greenstone ore. The default choice for Geita and Bulyanhulu-style circuits.
View product & specs →
6×12 Coconut Shell — CIL/CIP
6×12 mesh · iodine 1050+ · A.A.R.L. attrition max 2%
The global-standard 6×12 mesh with full TDS/COA — high iodine gives the spare activity you want when preg-robbing carbon in the ore is already competing for dissolved gold. Request a data sheet for your metallurgical team.
View product & specs →
Coconut Granular — Mine Water
8×30 / 12×40 mesh · iodine 1000–1200
For the remote camps around the Lake Victoria goldfields — polishes potable and process water, removing organics, turbidity, and residual cyanide where municipal supply doesn't reach. A practical add-on to your gold-carbon order.
View product & specs →
Carbon Specs for Lake Victoria Greenstone Ore
Tanzania is one of Africa’s top gold producers, with world-class mines around the Lake Victoria greenstone belt. Preg-robbing carbonaceous ore and high-throughput CIL circuits put a premium on carbon activity and ultra-high hardness.
| Parameter | Value | Why It Matters |
|---|---|---|
| Iodine Number | ≥1050 mg/g | High activity to out-compete preg-robbing carbonaceous matter in the ore |
| Ball-Pan Hardness | >98.5% | Minimises fines in agitated CIL tanks — protects gold-room recovery |
| Mesh Size | 6×12 (CIL) / 6×16 (CIC) | Coarse for agitated leach; finer for carbon columns |
| Gold Loading | >30 mg/g | Fast pickup where preg-robbing competes for gold-cyanide |
| CTC Activity | ≥55% | Rapid kinetics for Lake Victoria high-throughput circuits |
| Ash Content | <3% | Cleaner elution and lower reactivation ash build-up |
Gold Recovery Applications in Tanzania
Tanzania’s gold sits around the Lake Victoria greenstone belt, home to Geita, Bulyanhulu, North Mara, and Buzwagi. We match the right carbon grade and activity to each circuit and ore type.
Lake Victoria CIL Plants
Greenstone-belt giants like Geita (AngloGold Ashanti) and Bulyanhulu (Barrick) run large carbon-in-leach circuits. High-activity 6×12 carbon maximises gold pickup even as preg-robbing organics compete for the gold-cyanide complex.
Preg-Robbing Ore Management
Carbonaceous ore can strip dissolved gold before it reaches your carbon. High-iodine, high-hardness carbon plus tight residence-time control keeps recovery high — we help spec the right activity for your ore.
Carbon-in-Column (CIC)
For clarified or heap-leach solutions, 6×16 hard coconut carbon keeps head loss low in tall percolation columns while maximising gold pickup.
Mine & Camp Water
Coal-based GAC for potable water and process-water polishing at remote sites — removes organics, turbidity, and residual cyanide.
Preg-Robbing Technical Guide
Managing Preg-Robbing Ore With the Right Carbon
Several Lake Victoria ore bodies carry natural carbonaceous matter that adsorbs dissolved gold before your activated carbon can — the “preg-robbing” problem. Below is a four-step mitigation framework used at Geita, Bulyanhulu, and North Mara, and how carbon selection fits each step.
1. Diagnose
TOM & preg-robbing index
Measure total organic matter (TOM) and run a preg-robbing test — spike a gold-cyanide solution, contact with ore, and measure gold re-adsorbed onto the ore. Above ~50 g/t equivalent, the ore is actively competing with your carbon.
2. Out-compete
High-activity carbon, high concentration
Raise carbon activity (iodine ≥1050, high pore volume) and inventory so activated carbon adsorbs the gold-cyanide complex faster than the carbonaceous matter can. CIL — leaching and adsorption in the same tank — beats CIP here because gold never sits in solution unprotected.
3. Blank / passivate
Blanking agents & kerosene
Dose blanking agents (e.g. kerosene, diesel, or proprietary passivants) to blind the ore's carbonaceous sites before or during leach, so dissolved gold stays available for your carbon rather than the ore.
4. Control residence
Staged addition & tight timing
Shorten the window gold spends in solution: stage carbon addition, tune tank-to-tank advance rate, and keep carbon-to-ore ratio high in the lead tanks where dissolution peaks.
Preg-Robbing Severity & Carbon Strategy
| Ore Type | TOM / Preg-Rob Index | Recommended Approach |
|---|---|---|
| Mildly preg-robbing | < 50 g/t Au-equiv | Standard CIL with high-activity 6×12 carbon and elevated inventory usually holds recovery. |
| Moderately preg-robbing | 50–200 g/t Au-equiv | CIL + blanking agents + high carbon concentration; consider higher carbon advance rate in lead tanks. |
| Strongly preg-robbing / double refractory | > 200 g/t Au-equiv | Oxidative pre-treatment (roasting, POX, or BIOX) to destroy carbonaceous matter, then high-activity CIL. Carbon activity is critical post-oxidation. |
Why Carbon Activity + Hardness Is the First Line of Defence
Before blanking agents or pre-treatment, try the simplest lever: carbon that out-competes the ore. Iodine ≥1050 mg/g gives the pore volume and surface area to adsorb gold-cyanide faster than carbonaceous matter. Hardness >98.5% keeps that activity intact across 20–30+ reactivation cycles, so you don’t gradually lose the race.
Run it at high carbon concentration in a CIL configuration: gold is captured almost the instant it dissolves, leaving minimal time exposed to the preg-robbing ore. This single change has recovered 2–5% more gold at several Lake Victoria plants before any chemical dosing was added.
Verified Shipment
Real Tanzania Shipment — Bill of Lading
Documented ocean freight from our factory to Dar es Salaam: 28.2 tonnes of activated carbon (1,120 bags) shipped via MSC from Xiamen to Dar es Salaam in a 40’ high-cube container.
Shipment Details
- Carrier: MSC (Mediterranean Shipping)
- Route: Xiamen, China → Dar es Salaam, Tanzania
- Cargo: Activated carbon — 1,120 bags, 28,200 kg
- Container: 1 × 40’ high-cube
Factory-direct ocean freight to Tanzania’s main port, with full export documentation and third-party inspection available on request.
Inside Our Factory — Real Photos
Client factory visits, quality-control sampling, product close-ups, and container loading — every photo below is from our own operation.
Request a Quote
Get Tanzania Gold Recovery Carbon Pricing — Factory Direct
Tell us your mine, ore TOM/preg-robbing test results, circuit type (CIL or CIC), and tonnage. We reply with a carbon-selection recommendation, quote, TDS, and CIF pricing to Dar es Salaam within 24 hours.
Technical Guides & Regional References
We supply coconut shell CIL and column carbon to gold plants across Africa’s gold belts. Related technical references:
Tanzania Gold Recovery Carbon FAQ
What is preg-robbing, and why is it common in Tanzanian gold ore?
Preg-robbing is when naturally occurring carbonaceous matter in the ore adsorbs dissolved gold (the gold-cyanide complex) before your activated carbon can — effectively stealing gold from the pregnant solution and sending it to tailings. Several Lake Victoria greenstone-belt ore bodies carry organic carbon and graphitic material, so it's a recurring recovery problem for Tanzanian plants.
How do I know if my ore is preg-robbing, and how bad is it?
Run a preg-robbing test: contact a known gold-cyanide solution with your ore and measure how much gold the ore re-adsorbs, alongside a total organic matter (TOM) assay. Below roughly 50 g/t Au-equivalent the effect is mild; 50–200 g/t is moderate; above 200 g/t is strongly preg-robbing or double-refractory and usually needs oxidative pre-treatment. We can advise on interpreting your test data.
How does activated carbon selection help beat preg-robbing?
The strategy is to make your carbon win the competition for dissolved gold. High-iodine (≥1050 mg/g), high-pore-volume carbon adsorbs the gold-cyanide complex faster; running it at higher concentration and in a CIL configuration (leach + adsorb in the same tank) means gold is captured almost as soon as it dissolves. High hardness keeps that active surface area intact through the circuit so activity doesn't fade.
Do blanking agents work, and do they affect the carbon?
Yes — blanking agents such as kerosene, diesel, or proprietary passivants blind the ore's carbonaceous sites so they stop adsorbing gold. Dosed correctly they don't harm activated carbon performance, but they can add to organic fouling over time, which is another reason to use high-hardness carbon that tolerates repeated acid-wash and reactivation cycles.
When is CIL better than CIP for preg-robbing ore?
CIL (carbon-in-leach) runs leaching and carbon adsorption simultaneously in the same tanks, so dissolved gold is captured by carbon almost immediately and spends minimal time exposed to the ore. CIP (carbon-in-pulp) leaches first, then adsorbs — leaving a window where preg-robbing ore can strip gold. For preg-robbing ore, CIL is almost always the better choice.
What spec, pricing, and testing do you offer for Tanzania?
Coconut shell 6×12, iodine ≥1050 mg/g, hardness >98.5%, gold loading >30 mg/g. FOB Ningbo $3,200–$3,800/ton; MOQ 1 container with 50 kg to 5-ton trials for benchmarking against your ore. Every batch ships with a full COA, and SGS or Bureau Veritas third-party testing is available. Sea transit to Dar es Salaam runs 22–30 days.
Sourcing Carbon for Your Tanzania Mine?
Send us your mine, circuit type, ore characteristics, and tonnage. We’ll return a detailed quote with CIF pricing to Dar es Salaam, a full technical data sheet, and a delivery schedule within 24 hours.