Xinhai Mining Enables the Polymetallic Mine Project to Reach Production Ahead of Schedule

The total construction period was 198 days!

The Henan 1500TPD silver-lead-zinc-gold polymetallic ore flotation expansion project, undertaken by Xinhai Mining, officially started in early April 2024 and was completed and put into production by early November 2024.

Leveraging its "full industrial chain service for mining (EPCM+O)" model, Xinhai Mining independently handled the entire process — from process design, equipment manufacturing, civil construction, to installation, commissioning, construction management, and quality control.

The project was completed on schedule, put into production on time, and achieved production targets ahead of schedule, fully demonstrating Xinhai Mining's strong capabilities in large-scale mining engineering!

01Project Background

Xinhai Mining's 1500TPD silver-lead-zinc-gold polymetallic ore project is located in Henan Province.

The project's client is a Canadian listed company with strict requirements for quality standards, construction period, and cost control.

The original concentrator already had two 900TPD production lines. Due to the company’s strategic development needs, the client decided to expand by adding a 1500TPD production line adjacent to the original concentrator.

This expansion project not only tests Xinhai Mining’s design expertise and engineering experience, but also requires efficient coordination of resources throughout the construction process to ensure on-time, high-quality delivery without affecting the normal production of the original concentrator.

It serves as a comprehensive test of Xinhai Mining’s engineering and construction capabilities.

Project Overview

Ore properties

Silver, lead, zinc and gold polymetallic mine, mainly lead and zinc.

Process

Crushing and Screening Process:

A three-stage, one closed-circuit crushing process is adopted. The feed size is -200 mm, and the screened product size is -15 mm. The production capacity is approximately 200 t/h.

Grinding Process:

A one-stage closed-circuit grinding and classification process is used, with a grinding fineness of -200 mesh accounting for 60%–65%.

Gravity Separation Process:

The grinding circuit is equipped with a Nelson gravity separation system. The qualified slurry under the screen is transported to the Nelson concentrator and shaking table for gravity separation of gold ore, with Nelson concentrate being preferentially recovered.

Flotation Process:

Lead-zinc ore flotation adopts the process of preferential lead flotation, followed by zinc flotation from lead tailings.

Lead flotation: One roughing, three scavenging, and three cleaning stages.

Zinc flotation: One roughing, four scavenging, and three cleaning stages.

Dewatering Process:

Lead and zinc concentrates are dehydrated separately. A two-stage dewatering process is used: the first stage employs a thickener, and the second stage uses a ceramic filter.

02Xinhai Solution

Engineering

Xinhai Mining Design Institute designed the process flow, equipment selection, and configuration plan for the expansion of the beneficiation plant based on the on-site production process. The project was designed to expand to 1,500 TPD, with an actual reserved production capacity of 1,800 TPD.

Xinhai Mining's design team became involved at the early stage of the project, conducted a field investigation at the project site, and gained an in-depth understanding of the local material supply conditions. By optimizing the design and reasonably selecting equipment and materials, the project cost was effectively controlled, ensuring the operability and cost-effectiveness of the design plan.

Procurement

Xinhai Mining has strong equipment manufacturing capabilities and can produce more than 1,000 types of equipment for mining, beneficiation, and smelting. It can provide a full set of main and auxiliary equipment for mines with a production capacity of up to 50,000 tons/day.

For the Henan polymetallic mine project, Xinhai Mining supplied thickeners, agitation tanks, and other beneficiation equipment. In terms of material procurement and usage, Xinhai strictly controls material specifications and models, and minimizes the variety of materials such as concrete, steel bars, and bolts, thereby simplifying the procurement process.

Due to the extremely limited storage space at the project construction site, on-site material procurement followed a "small-quantity, multiple-batch" strategy, with timely planning, approvals, and purchasing. Materials shipped from the company also arrived at the site on schedule and in an orderly manner, ensuring that the project construction progress was not delayed.

Construction

As the general civil engineering contractor for the Henan silver-lead-zinc-gold polymetallic mine project, Xinhai Mining independently undertook all engineering work within the scope of the plant construction. This included equipment procurement and supply, civil engineering and installation, commissioning tests and inspections, system trial operations, defect elimination, performance testing, system performance acceptance, technical and after-sales services, and project completion acceptance.

The scope covered mineral processing equipment, electrical engineering, process pipelines, process platforms and other non-standard parts, steel structure plant construction, powder ore bins, grinding and flotation workshops, concentrate thickening, concentrate filtration, circulating water and return water systems, substations, communication systems, instrument control systems, retaining walls, and supporting auxiliary facilities.

03Project Highlights

EPC General Contracting – Full Industrial Chain Service

Xinhai Mining provides "mining full industrial chain services (EPCM+O)" for the Henan polymetallic mine project, covering the entire process from process design and engineering construction design to equipment manufacturing, civil construction, and installation of the beneficiation plant, as well as construction management and quality control. This one-stop solution reduces project management difficulties, ensures the efficient and high-quality advancement of the project, and fully demonstrates Xinhai Mining's professional capabilities and customized service advantages in the field of mining services. At the same time, by carrying out design and construction simultaneously under the EPC model, the construction period is shortened, creating significant value for the project.

Innovative thinking - mine design optimization

Xinhai Mining Design Institute has enhanced ore processing capacity, production flexibility, and metal recovery rates through design optimizations such as adding powder ore bins, an intelligent waste disposal system, and a third series of grinding plants. These improvements have helped the project achieve higher production efficiency and better resource utilization. The key design highlights include:

Added Powder Ore Bin and Intelligent Waste Disposal System

Expanded the Third Series of Grinding Plants

Added the Third Series of Flotation System

Upgrade of Concentrate Concentration System

Efficient mine management

Xinhai Mining has established a scientific and standardized mine management system, along with comprehensive rules and regulations, to ensure the effective, safe, and reliable operation of the project. In terms of project quality control, it strictly uses brand-name building materials and follows standardized construction practices to ensure quality. It also implements safety inspection mechanisms and conducts regular training to reinforce safety. Regarding personnel training, the company has developed a standardized process system that includes material procurement, organizational structure, and code of conduct. The project implements an assessment and reward system, holds regular weekly meetings to ensure the system's enforcement, and sets a benchmark for mine project management through refined management and innovative mechanisms.

conclusion

The successful commissioning of the Henan 1500TPD silver-lead-zinc-gold polymetallic mine project not only highlights Xinhai Mining's strength in large-scale mining engineering construction but also showcases the advantages of its "full industrial chain mining service (EPCM+O)" model. With its professional technical expertise and efficient construction management, Xinhai Mining ensured the project was completed and put into production within 198 days, delivering a satisfactory result to the client. Moving forward, Xinhai Mining will continue to leverage its top-tier qualifications for general contracting in mining engineering and its extensive industry experience, while upholding the service concept of "what you need is what we do." The company aims to provide more efficient and reliable "full industrial chain mining services (EPCM+O)" to global mining clients, helping drive the green and intelligent transformation of the global mining industry.