The current methods of treatment refining doesn’t require any chemical to recover gold. A centrifuge operates the high density of gold and separates it from other particles through the action of high pressure water jets.
Water management’s goal is the zero discharge. Used water is drained towards a settling pond with an overflow that lets the water into another pond. Clean water is then pumped and reintroduced into the treatment process. This closed circuit operation is subjected to regular quality inspections. Samples are taken at different points in the circuit to be tested by an approved laboratory.
Tailings are sent to a tailings storage area for a future reprocessing stage. The storage area is surrounded by dykes that are regularly monitored by a geotechnical expert.
Waste rock management
Waste rock dumps are made with excavated material that doesn’t contain enough gold to be treated at the plant. Materials are piled up in areas separated from forest lands and rivers by dykes. Effluent water is treated in settling ponds before evacuated in the nature.esponse possible in case of an accident.
Actions are done in order to do efficient collection and also to minimize quantity.
To reduce waste disposal on site, CME fosters buying local goods rather than importing them. Since 2008, a mobile sawmill was set up in order to use the noble wood species doomed to be slaughtered. Beams, posts and necessary construction boards are produced thereby reducing the intake of iron and concrete in the buildings construction. An advantage that is also noticeable at the end of operation where the environmental impact of wood, a biodegradable material, is reduced.
A collection is done on the site for all the waste generated by the operations such as oils, filters, batteries, small domestic batteries and industrial waste in general. The collected waste is then transported to the coastline and given to an authorized collector.
What will be the impact of the project in the surrounding environment? How to describe an environment as rich and complex as the Amazon rainforest? In collaboration with an ecologist, we proposed a new approach upstream studies of doing systematic surveys. Our approach was as follows: at the same lease scale, rather than trying to count one by one all living species of the area, and before trying to find specific species, we proposed to identify the existing habitats.
The methodology applied to this cartographic work was largely inspired by what offers the NFB (habitat mapping) across Guiana.
Many steps are necessary:
- Development of a numeric terrain model
- Maps showing the different terrain slopes
- Create a geology and soil map
- Create a map containing all habitats
Below is a map showing the analysis of Esperance mine site. A lot of information can be extracted from these maps that allow to optimize and to clarify the arrival of different species specialists.