PILOT TESTING AND LABORATORY ANALYSIS
Pilot testing and lab analysis are essential steps before scaling up any gold VAT leaching operation. They help determine if the process is technically and economically viable and guide process optimization.
Here’s how each is used:
Laboratory Analysis (Small-scale testing)
Purpose:
- To understand the ore’s behavior and chemistry in controlled conditions.
Key Activities:
- Sample characterization: Identify mineral composition, gold distribution, and ore hardness.
- Leach tests: Bottle roll or mini-VAT tests to check gold recovery with various cyanide concentrations, pH, and leach time.
- Reagent optimization: Determine ideal dosages of cyanide, lime, and other additives.
- Head grade & tailings assays: Measure gold content before and after leaching.
- Kinetic studies: Analyze how fast gold dissolves at different conditions.
Outcome
- Establish basic leaching parameters (e.g., ideal particle size, retention time, pH, and cyanide level).
Pilot Testing (Intermediate scale)
Purpose:
- To simulate actual plant conditions and validate lab findings on a larger, practical scale.
Key Activities:
- Construct test vats or columns using actual ore.
- Use real ore throughput rates to observe flow, percolation, and solution recovery
- Monitor leach kinetics, recovery, and reagent use over days/weeks.
- Test solution recycling, detox methods, and gold recovery systems.
- Observe operational issues like clogging, scaling, or drainage problems.
Outcome:
- Fine-tune process parameters for scale-up.
- Identify operational challenges.
- Support engineering design and cost estimation for full-scale plant.
IN SHORT SUMMARY
- Lab tests = What works (scientific baseline).
- Pilot tests = What works in practice (real-world simulation).
- Together they reduce risks, costs, and failures during full-scale implementation.
