Cyanide is used to extract gold from the ore after being subjected to an oxidation treatment. The dumping of this substance must be monitored to ensure the effectiveness of the process. The titrimetric method was assembled in the metallurgy laboratory to determine the cyanides present in the non-domestic wastewater samples, with concentrations greater than 0.5 mg CN-/L. The necessary laboratory equipment to analyze samples in real time is available.

Project Results

By monitoring the concentration of cyanide dumped from the Tailings Dam to the water source, the company reduces and controls contamination due to toxic substances. The internal measurements resulted in mg CN/L values ranging between <0.50 to 0.90 without exceeding the permissible limit of 1.00 mg/L.

Other benefits:

Availability of results in real time that facilitate decision-making processes and the application of controls. Savings due to lower demand for analysis of samples in external laboratories. 12 samples per month for savings equivalent to $6,913 USD/year. The project makes it possible to evaluate the efficiency of the detoxification system used for the treatment of the effluents coming from the cyanidation circuit