Choosing the right crusher is hard. Small gold mines have tight budgets. You might face hard rocks. You need to decide between mobile or stationary units.
Gold ore is often hard rock. It has high compressive strength. Usually over 200 MPa. The structure of your crusher matters. You need a high reduction ratio.
The reduction ratio is key. It is the input size divided by output size. Mobile units use compact frames. Stationary units use heavy steel frames. The heavy frame stops vibration.
Less vibration means less wear. This protects the bearings. Small mines need reliable gear. Breakdowns cost money. We see this often.
You must know these terms. CSS stands for Closed Side Setting. OSS stands for Open Side Setting. They control product size.
Why is this important? Because gold recovery depends on size. Fine ore releases more gold. CSS determines the smallest gap. This happens during the crushing cycle.
If CSS is too small power spikes. If CSS is too big rocks are big. You lose gold. Mobile crushers have hydraulic adjust. It is fast. Stationary ones might use manual adjust.
Mobile crushers are on tracks. Or they are on tires. They move with the mine face. This is good for small veins. You save on trucking costs.
The engine is usually diesel. Some are hybrid. They use motors and hydraulics. The “Mining Journal” 2023 data shows trends. Mobile units save 30% on transport costs.
But diesel is expensive. Operating cost is high. You must check fuel prices. Also maintenance is tight. Spaces are small.
Stationary crushers sit on concrete. They do not move. They connect to grid power. Electricity is cheaper than diesel. Usually 50% cheaper per ton.
They have big motors. They handle power surges better. The feed opening is stable. You can feed them with big trucks.
But you need a permit. You need concrete. Installation takes time. Maybe 3 months. Mobile takes 3 days. This is a big trade off.
Let’s look at numbers. Data comes from field tests. We used SBM machines. The rock was granite. It mimics gold ore well.
| Parameter | Mobile (Track) | Stationary (Fixed) |
|---|---|---|
| Max Capacity (tph) | 200 | 350+ |
| Energy Cost ($/ton) | 0.45 (Diesel) | 0.22 (Grid) |
| Availability (%) | 85% | 92% |
| Setup Time | 2-5 Days | 4-8 Weeks |
Stationary wins on cost. Mobile wins on time. You must choose.
Short projects need speed. If the mine lasts 2 years, buy mobile. Why? Because you can sell it later. Resale value is high.
Stationary plants are stuck. Concrete costs are sunk costs. You cannot sell a foundation. You lose that money.
SBM mobile units hold value. Buyers like used mobile crushers. They are easy to ship. This reduces your risk.
This is a pain point. Many gold mines are remote. The grid is weak. Or it does not exist.
If grid is bad, stationary is risky. You need big generators. Generators are expensive. They burn diesel too.
So, mobile is better here. It has its own engine. It is independent. You do not fear blackouts. Production keeps going.
Let’s look at Mali. A client had a small pit. The gold vein was scattered. He needed 50 tons per hour.
We chose the SBM Mobile Jaw. Model YG938E69. It has a vibrating feeder. It has a jaw crusher PE600x900.
The feed size was 500mm. Output was 0-100mm. He moved the machine 4 times. In one year. He saved truck money.
Client said: “It walks like a tank. We follow the gold. Maintenance is okay. SBM sent parts fast.”
This client was different. He had three small pits. He wanted a central plant. Target was 150 tons per hour.
We built a stationary line. PE750x1060 Jaw. Then a CS Cone Crusher. Plus a VSI for sand making.
Product was fine powder. 0-5mm for leaching. The stationary setup was stable. It ran 20 hours a day.
Energy bill was low. He connected to local hydro power. The SBM tech helped pour concrete. It was solid.
Mobile units are tight. Changing parts is hard. You have little space. Mechanics hate cramped spots.
Stationary units have walkways. You have cranes. Changing a mantle is easier. Changing a liner is safer.
Safety is key. Stationary plants are safer. Mobile plants have moving tracks. You must be careful.
Here is a simple tree. Use this to decide. It works for 90% of miners.
Stationary machine cost is lower. But installation is high. Mobile machine is pricey. But installation is zero.
Yes you can. But size it right. Electric motors have startup current. It is 6x normal current. You need a big generator. It might be costly.
It depends on rock. For hard granite, maybe 400 hours. For soft gold ore, maybe 800 hours. SBM uses high manganese steel. It lasts longer.
Very fast. Track units move instantly. Wheel units need a truck head. Setup takes 1 day. You fold the belts. You drive away.
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