Background
SGME developed a sampling plan that allowed us to define the location of potentially acid-forming (PAF) and non-acid forming (NAF) waste rock in the waste rock dump (WRD). The gold mine includes open cut and underground operations, and is located approximately 800 kilometres north-west of Sydney near the town of Cobar.
Objective
The WRD at the mine is the largest source of borrow material for rehabilitation of the PAF tailings storage facility (TSF). However, little was known about the geochemical composition of the WRD.
Solution
SGME used a drill rig to extract sample cores from different depths within the WRD, ensuring representation of the site’s geochemical profile. These samples were then subjected to screening in the field using handheld x-ray fluorescence technology which allowed immediate measurement of total sulfur. Additionally, pH and electrical conductivity (EC) were measured using paste extract methods to provide further data on the samples’ chemical properties.
The field screening test results were pivotal in categorising waste rock samples into potentially acid-forming (PAF), non-acid forming (NAF) or uncertain (UC) groups. This classification was instrumental in identifying areas of concern and determining the suitability of waste rock for specific applications such as rehabilitation or stockpiling.
To further enhance the analysis, a subsample from each waste rock category was sent to a laboratory for confirmation testing. This included measuring the total metal composition and total sulfur content as well as testing pH and EC using laboratory equipment. The combined results from field screening and laboratory analysis provided a detailed understanding of chemical composition of the waste rock which allowed for accurate decision-making.
Engaging SGME for field testing results in precise data collection and real-time insights. We will deliver our services in a way that is cost-effective, customised and aligned with regulatory requirements to enable informed decisions, support operational efficiency and maximise savings for your project.
