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In our traditional perception, the mining industry is often associated with dust-filled air, deafening noise, and the continuous discharge of wastewater. This was indeed true of many mining enterprises in the past. However, today, in response to the global call for "green mining", every mining company bears the responsibility of contributing to environmental protection.
Xinhai Mining is fulfilling this responsibility through practical and consistent actions.
This article takes the 300t/d gold project in Oceania, undertaken by Xinhai Mining, as an example to showcase the ecological blueprint of a green mine.
A few years ago, during Xinhai's initial on-site inspection of the project, it was discovered that the mine contained numerous ore veins with varying mineral properties, which posed significant challenges for mineral processing.
To address this, Xinhai Mining assembled a project team consisting of experienced experts, test engineers, project managers, and operators. The team first conducted a series of mineral processing tests. After multiple flotation and carbon slurry (CIP/CIL) trials and in-depth discussions between both parties, the customer adopted Xinhai's proposed gravity separation + carbon slurry process, which was further optimized into the final flow of gravity separation + intensive leaching + carbon slurry adsorption. Xinhai was fully responsible for the EPC services of the project.
(1)Gravity Separation Pre-Enrichment
A combination of spiral chute and shaking table was used to recover 50–55% of coarse free gold in advance, significantly reducing the downstream processing load.
(2)Intensive Leaching Enhancement
Cyanidation conditions were optimized for high-grade slurry to break through the efficiency bottlenecks of traditional leaching.
(3)Carbon Slurry Adsorption & Purification
Deep adsorption of gold ions was achieved through the CIL circuit, completing the closed loop of the gold recovery process.
(1)Upgraded Intensive Leaching Technology
By precisely controlling cyanide concentration, maintaining appropriate slurry pH, and regulating temperature and other key parameters, the issue of "gold surface passivation" (surface film formation) was effectively resolved.
(2)3D Pipeline Design Preview
BIM (Building Information Modeling) technology was applied to perform pipeline collision detection, reducing on-site rework by 70%.
(3)Seamless Integration of SEPRO Equipment
Achieved smooth connectivity between the intensive leaching system and the gravity separation/CIL modules through deep integration of SEPRO systems.
This optimized process flow enables ore with a gold grade of 8.6 g/t to achieve a comprehensive gold recovery rate of 90%, exceeding traditional solutions by more than 15%. The daily processing capacity remains stable at the designed throughput of 300 tons per day.
Within the mine site, there is a mountain stream that flows through the area. The riverbed is relatively wide, and the water level is typically low, resulting in a shallow and narrow flow. However, during flood season, the river overflows its banks and inundates the floodplain.
Protecting this river and its surrounding ecological environment has become a core component of Xinhai’s green mining practices. After evaluating multiple options, a comprehensive “Avoidance–Protection–Restoration” strategy was adopted, with the following key measures:
During the early stages of site preparation, the riverbanks were protected using engineered slopes. A combination of cobble mounding and dry-laid block revetments was employed, which not only maintains bank permeability but also enhances hydrological connectivity.
To minimize ecological disturbance, the belt conveyor system was designed to span the river using a large-span truss structure, ensuring zero interference with the river channel and unobstructed flood flow.
During construction, the truss support foundations were set back from the riverbank (bank retreat method), and a 50-meter buffer isolation zone was established to restrict construction equipment from approaching the embankment.
Water-tolerant vegetation was planted along the embankment to create an ecological buffer zone, effectively preventing soil erosion and conserving water.
A “no construction in floodplain areas” principle was implemented, along with a rainwater diversion system to reduce the risk of heavy metal leaching during rainfall. In addition, all dredged soil from the river channel was 100% backfilled and reused, ensuring zero waste discharge.
EPC refers to the one-stop project delivery service that covers Engineering, Procurement, and Construction. In this Oceania gold mine project, Xinhai implemented a three-phase progressive design delivery approach during the design stage, in accordance with client requirements. During construction, multiple safeguards were put in place to ensure project control and stability. In the final delivery stage, Xinhai provided value-added services such as personnel training and assistance with environmental certification.
Following the client's three-stage drawing delivery requirement—IFR (Issued for Review), IFA (Issued for Approval), and IFC (Issued for Construction)—Xinhai submitted corresponding design documentation at each stage:
· IFR Stage (Issued for Review):
Xinhai submitted preliminary design documents (e.g., process flow diagram, equipment layout), allowing the client to evaluate the process and provide feedback.
· IFA Stage (Issued for Approval):
Based on IFR feedback, Xinhai refined the design and submitted detailed drawings with technical parameters. The client reviewed and signed off on the selection of key equipment (e.g., SEPRO leaching tank model).
· IFC Stage (Issued for Construction):
Xinhai delivered finalized construction-ready drawings, including detailed specifications such as bolt hole positions and pipeline routing. These were filed by the client for records and used as acceptance criteria.
In addition, Xinhai provided 3D piping design, enabling collision detection and accurate material estimation, which helped reduce material waste and shorten the construction schedule.
· Full-process supervision of the SEPRO intensive leaching system installation and 72-hour integrated commissioning run.
· Dedicated river protection team established to inspect the construction buffer zone daily.
· Real-time construction site monitoring and weekly dual reporting on project progress and environmental compliance.
· Feasibility evaluations for any design modifications completed within 24 hours.
During project delivery, Xinhai offered three-tier training programs for staff, covering operators to senior management, and assisted the client in obtaining local green mining certifications and environmental compliance approvals.
Conclusion
The 300 t/d gold mine project in Oceania is not only another successful case for Xinhai but also a testament to our commitment as a comprehensive green mining solution provider.
Today, mining enterprises face two major challenges: on the one hand, declining ore grades as mining depth increases, and on the other hand, increasingly stringent environmental protection requirements. Striking a balance between efficient resource development and ecological preservation has become an essential issue for every mining operation.
Xinhai Mining firmly regards the development of green mines as the cornerstone of sustainable mining and long-term competitiveness in the mining industry. We aim to reduce pollution at the source by optimizing processing flows and improving concentrate grade and recovery rates through technological innovation.
By choosing Xinhai, you can build a green, efficient, and economically viable mining operation.
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