Most gold project developers picture a conventional stick-built plant when they first scope a processing facility. A portable gold processing plant changes that assumption. In many cases, a modular gold plant is the faster, lower-risk way to move from orebody to pour. Instead of constructing every foundation, steel frame and pipe run on site, you receive factory-assembled modules that are transported to the mine, bolted together and commissioned in weeks rather than months. Xinhai reports that its modular engineering team has delivered plants in more than 100 countries.
What a Modular Gold Plant Is
A modular gold processing plant is a pre-engineered, containerised or skid-mounted plant built from factory-assembled modules. The crushing, milling and recovery circuit are split into transportable blocks. Each block is pre-wired, pre-piped and tested in the factory before it leaves for site. On site, you connect the modules to power, water and feed lines, then commission. This approach differs from a conventional stick-built plant, where nearly all civil work, steelwork and fitting happen in the field. The same engineering standards apply as a full plant, and the flowsheet is still fixed from ore testwork. How gold milling works explains the full comminution and classification sequence behind these modules.
Why Operators Choose Modular
Factory pre-assembly cuts site construction time sharply, so you reach production faster. Standardised modules usually cost less than a bespoke build for smaller throughputs. Modules are tested before they leave the factory, which reduces commissioning surprises on a greenfield site. A modular plant can start small and expand as the deposit proves out. Xinhai reports that its three manufacturing bases total about 110,000 m² and support processing capacities up to 50,000 t/d. That scale matters when you choose a supplier, not just a design. Building a gold processing plant from modular packages avoids many onsite variables that delay conventional construction.
- Speed — factory pre-assembly and testing cut on-site construction time sharply.
- Lower up-front cost — standardised modules cost less than a bespoke build for smaller throughputs.
- De-risked delivery — modules are tested before they leave the factory.
- Scalability — a modular plant can start small and expand as the deposit proves out.
According to the US Geological Survey, about 7% of US gold mine output in 2024 came as a byproduct of processing base-metal ores, chiefly copper. USGS gold commodity summary tracks this annual flow. Modular plants suit operators who want to bring a small orebody online quickly without committing to a full stick-built site.
What a Modular Plant Includes
A typical modular gold plant covers the full flowsheet in modules. The crushing module uses jaw and cone crushers. The milling module holds a ball mill and classification circuit. The recovery module can run gravity concentration, CIL/CIP leaching or both. Tailings and water modules handle thickening and water management. Xinhai manufactures the same equipment range across its bases. The equipment matrix includes ball mills up to φ7 m, flotation cells up to 320 m³ single-cell volume, leach tanks up to 20 m × 20 m, and thickeners up to φ100 m. These are the same machines used in conventional plants, just packaged differently. Gold milling plant solutions show how crushing, grinding and classification circuits are configured for specific ores. For leaching-based flowsheets, the Gold CIL plant solution packs the same recovery technology into modular skids.
Is Modular Right for Your Deposit?
Modular plants suit small to mid-size deposits, pilot operations and projects in remote locations where on-site construction is hard. For large, high-throughput operations, a conventional engineered plant is usually the better fit. The decision starts with ore testwork and a realistic production target. Xinhai's design capability spans 10 t/d to 50,000 t/d, so there is no single modular cut-off. A plant treating 1,200 t/d can be a strong modular candidate if the site is remote and the orebody is well understood. Ore testwork drives whether you use gravity, flotation, leaching or a combination.
Gold recovery methods change the module count and footprint, so don't select a package before you know the feed. The key question is whether the deposit's scale justifies a stick-built plant. If not, modular often wins on cash flow timing.
Engineering and Testwork Before You Commit
Ore testwork is not optional, even for a modular plant. Xinhai operates a CNAS-accredited laboratory to ISO/IEC 17025. It runs about 200 metallurgical tests per year and processes around 5,000 element analyses per month. Bond work index tests define grinding energy. These results feed the design of a modular flowsheet, not a guess. CNAS accreditation means the laboratory's methods and reporting follow an internationally recognised standard. No modular supplier should quote equipment without seeing your head grade, mineralogy and grindability.
You can not shortcut this step. A portable gold processing plant built to the wrong grind size or reagent scheme will underperform. Talk to an engineer after you have representative samples.
How Xinhai Delivers Modular Plants
Xinhai's modular engineering sits inside an EPC+M+O model. The company designs, procures, builds, manages construction and can operate the plant. Its design institute holds a Class B metallurgical qualification, not Class A. That matters for Chinese-registered design work. Overseas, Xinhai aligns deliverables with standards such as JORC and NI 43-101. Compliance with these standards supports technical reporting, but they are not a guarantee of regulatory approval in every country.
- Run ore characterisation and metallurgical testwork.
- Design the flowsheet and split it into factory-built modules.
- Pre-assemble and test modules at one of the three manufacturing bases.
- Ship containers or skids to site and commission after minimal civil work.
This sequence is standard for modular projects. Xinhai reports that it has served 2,500+ mines and delivered 600+ EPC+M+O projects. Those are company self-reported figures, not independent audit data.
How to Size a Modular Gold Plant: Ordered Steps
A modular gold plant is not a one-size-fits-all package. The sizing sequence begins with ore characterisation and continues through equipment selection and factory testing. Use this ordered procedure when you evaluate a modular flowsheet.
- Run ore characterisation and metallurgical testwork. A CNAS-accredited laboratory can measure head grade, mineralogy and Bond work index. Xinhai runs about 200 metallurgical tests per year and processes around 5,000 element analyses per month under ISO/IEC 17025.
- Set a throughput target in tonnes per day. Xinhai's modular design capability spans 10 t/d to 50,000 t/d, so the target must fall inside that band before you proceed.
- Select the required modules from crushing, milling, recovery, tailings and water. Each module is pre-wired, pre-piped and tested in the factory.
- Match major equipment to the established matrix. Ball mills are available up to φ7 m; flotation cells up to 320 m³ single-cell volume; leach tanks up to 20 m × 20 m; thickeners up to φ100 m.
- Confirm factory test reports and module interfaces before shipping. The three manufacturing bases total about 110,000 m², which supports parallel pre-assembly of several modules.
This ordered procedure keeps a modular plant inside the same engineering envelope as a conventional plant while reducing site construction time.
Cyanide Handling and Compliance
CIL and CIP circuits can reach 99% recovery on suitable ores, according to Xinhai's published capability. That figure is not a promise for every feed. Cyanide is highly toxic, and its storage, transport and use are governed by site-specific safety procedures and, in many jurisdictions, the International Cyanide Management Code. The Code is a voluntary industry programme covering production, transport, storage and use. Third-party audits verify signatory operations. When you choose a modular plant with leaching, you are also choosing the compliance burden that goes with it. CIL vs CIP compares the two main carbon circuits and their operational differences.