Hard rock Gold mining process
Rock gold (also known as vein gold or primary gold) is hosted in quartz veins, fractured alteration zones, or sulfide ore bodies. Gold is embedded in the gangue and sulfides in the form of native gold, microscopic gold, and submicroscopic gold. A hard rock gold mining process is an integrated system designed to extract & separate gold from various rock minerals through a series of beneficiation processes. It mainly involves crushing, screening, grinding, gravity separation, flotation, leaching, cyanidation, or melting; purification & recovery rates of 90-95%+.
Applicable ore types: Quartz vein-type gold deposits, altered rock type (fracture zone altered rock) gold deposits, gold associated with sulfide minerals, oxidized/mixed type lode gold ores, polymetallic associated gold ores (gold-copper, gold-lead-zinc), and low-grade hard rock gold ores.
Hard Rock Gold process
4 Key Characteristics of Rock Gold Ore: “low-grade, fine-grained, complex, and hard.”
- Gold particles in lode gold ore are typically fine-grained and heavily encapsulated; they may occur as fissure-hosted gold, intercrystalline gold, inclusion-hosted gold, or lattice-bound gold (microscopic/submicroscopic gold).
- The particle size distribution is extremely wide, so a combined approach of “gravity separation for coarsening and flotation or leaching for finer particles” must be adopted.
- For high-hardness ore (characterized by high quartz content and a Mohs hardness of 7), the processing strategy should prioritize “more crushing, less grinding” to minimize energy consumption.
- Harmful elements (such as arsenic, copper, or organic carbon) can interfere with gold recovery, necessitating a pre-treatment stage.
Rock Gold Mining Process
⇒ Feeding & Crushing: Vibrating feeders are responsible for uniform and adjustable-speed feeding. Crushing mainly uses a two-stage closed-circuit or a single-stage closed-circuit process. The jaw crusher or cone crusher is used for coarse ore; then, a secondary rock crusher is used for medium and fine ore crushing operations.
⇒ Grinding & Classifying: For the requirement of gold ore grinding fineness, a ball mill is usually used together with a spiral classifier, and the qualified particle size is below 200 mesh.
⇒ Beneficiation Stage:
- Gravity separation (eco-friendly): The gravity separation process is mainly used to separate rock gold deposits with a simple structure and coarse grain size, especially the oxide rock gold deposits with high density. It relies on large differences in density between the target metal (gold) and the materials in which it is found. Main gravity separation equipment including sluices box, spiral chutes, jigs, centrifugal concentrators, and shaker tables.
- Flotation (sulfide ore): For fine-grained gold associated with sulfide minerals. Achieves superior recovery for complex refractory gold ores.
CIP/CIL Leaching Plant (high recovery): Carbon-in-pulp / carbon-in-leach process for refractory gold ores requiring chemical extraction. 95% recovery even for low-grade ores.
| Rock Gold Ore Type | Core Process |
| Quartz vein gold ore | Gravity separation recovery in the grinding circuit for coarse gold; then flotation or cyanide leaching. |
| Altered rock gold ore | Fine grinding for full liberation; CIL/CIP as main route, gravity for coarse gold. |
| Gold-bearing sulfide ore | Flotation to produce gold concentrate. |
| Oxide / mixed gold ore | Direct CIL or + gravity separation. short flowsheet, high recovery. |
| Polymetallic gold ore | Selective or bulk flotation for separate gold, copper, lead, and zinc recovery. |
| Carbon- and arsenic-containing refractory gold ores | Flotation + roasting/bio-oxidation pretreatment + cyanidation. |
| High-clay / high-slime ore | Washing and desliming plus dispersant conditioning to control pulp viscosity. |
| Low-grade hard-rock gold ore | Heap leaching or modular plants: low unit cost. |
Because rock gold contain a variety of minerals or impurities, it is necessary to use a combination of multiple processes for complex ores, such as washing, screening, flotation, magnetic separation, CIP, CIL, etc. In addition, JXSC also offers customized modular and mobile hard rock gold processing plants featuring a modular, containerized design; these units can be rapidly deployed and relocated, making them an ideal choice for exploration and short-term projects. From rock ore to gold bar – tailor-made gold beneficiation solutions based on your ore (such as hardness, gold particle size), capacity, site conditions, production targets, and budget.
hard rock gold processing plant
♦ rock gold processing plant
The following is a detailed description of the rock gold processing plant flow:
1. The raw ore is evenly fed into two jaw crushers by vibrating feeder for primary and fine crushing, crushing large rocks into smaller sizes.
2. Then, the material is fed into the vibrating screen, and the oversized stones are transported back to the fine gold crusher for further crushing;
3. The undersized ore into the transfer ore bin, the fine ore is transported to the ball mill via an electromagnetic vibrating feeder to grind the ore into powder. The ball mill and the spiral classifier form a closed-loop grinding device. The coarse particles are returned for re-grinding, and the materials into the centrifugal concentrator by a slurry pump to separate fine gold.
4. The tailings enter the sluice box to recovery more gold; all concentrates are sent to the shaking table to finely concentrate the gold. Then it goes into the gold melting furnace to be refined into gold bars
♦ rock gold crushing plant
This setup is a 5-10tph vein gold ore crushing plant, main equipment and flow details as follows:
1. The trough feeder can feed evenly to the crusher. Jaw crusher preliminary crushing of large rocks can also be made mobile type as requested. The hammer crusher output size is adjustable like 10mm,5mm, etc. For this project, the materials are ground to 0-2mm; it can also be made mobile type as per request.
2. Using a shaking table to recover fine gold, then it is melted into gold bricks through a gold melting furnace.
This plant can also be used for processing hard rock tin ore, coltan ore, tungsten ore, chrome, copper, etc. The capacity can be customized as requested, such as 20tph, 50tph, 100tph, etc.
Note: In such a small rock gold processing plant, if ultra-fine grinding (such as nanometer level) is required, oxidation agglomeration prevention is required, or fine slurry is directly produced for wet gold extraction processes such as cyanide leaching, a wet pan mill can be considered for its high efficiency, reliability, and low cost.
♦ Rock gold gravity separation plant
This is a complete set of 5TPH rock gold gravity separation line successfully customized by JXSC for customers in Cote d’Ivoire.
1. Feeding & Crushing: Raw materials enter the hopper through an excavator or forklift, and are evenly fed through a belt conveyor to the jaw crusher for primary crushing. The crushed materials enter the hammer crusher again through the belt conveyor for secondary crushing.
2. Gravity separation: Next, it is transported by the belt to the centrifugal concentrator for primary gold ore enrichment. The concentrate from the centrifuge enters the shaking table again for enrichment to obtain the final gold concentrate.
Hard rock gold processing plant for sale
Custom Rock Gold Solutions
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This setup is a 20tph rock gold crushing plant, mainly comprising a coarse jaw crusher, a fine jaw crusher, four sets hammer crushers, and gravity separators.
This setup is a 10tph alluvial gold and a 5tph rock gold mixed processing plant. Mainly has jaw crusher, hammer crusher, ball mill, spiral classifier, trommel scrubber, centrifugal concentrator, shaking table, and sluice box.
This is a flowchart of a 250TPH rock gold gravity separation plant, mainly including jaw crusher, cone crushers, double roll crushers, ball mills, centrifugal concentrators, shaking tables, sluice boxes, spiral dewatering machines, and dewatering screen.
This setup is one complete 240TPD (tons per day) rock gold CIL plant flowchart, including feeding, crushing system, grinding system, gravity separation, leaching process, activated carbon adsorption process, gold-loaded carbon desorption, and electrolytic stage.
This setup is a 120TPD rock gold gravity separation + CIP plant, including feeding, crushing, grinding, gravity separation, leaching process, activated carbon adsorption process, gold-loaded carbon desorption and electrolytic stage, and tailing water recycle system..
small scale rock gold process plant - High Recovery & Low Cost Solutions
JXSC hard rock gold plant is mainly centered around “efficient dissociation – precise sorting – low-consumption operation”. It pays more attention to “adapting to local conditions”: it can process rock gold (such as sulfide ore) and alluvial gold; it also supports mainstream processes such as gravity separation and flotation, and can also combine chemical leaching (such as the CIP/CIL process) to improve the recovery rate. Modular & compact designs, custom-proven process flow, and cost-saving equipment for small- to medium-scale hard-rock gold extraction, with low cost and fast ROI.
JXSC provides a complete set of gold processing solutions (flotation, CIP, CIL process, etc) and equipment according to specific mine production needs. The core function is to separate and enrich gold minerals in the raw ore into gold concentrate or finished gold through crushing, grinding, sorting, purification, and other processing steps. We also support customize small rock gold process plants with small investments, flexible and quick results.
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