In the aggregates and mining sector, not all materials behave the same, and not all crushing plants are prepared to process them efficiently. Each type of rock presents specific challenges: hardness, abrasiveness, shape, or moisture. These factors directly affect performance, equipment wear, and the cost per ton produced.
At ARJA, we develop impact crushing solutions tailored to the real conditions of each deposit. Our plants are designed to deliver precision, reliability, and high productivity, even when dealing with the most demanding materials.
This technical-commercial article analyzes the most common types of stone in quarries and gravel pits —dolomites, basalts, river pebbles, granites, and andesites— and explains how ARJA technology optimizes their processing from the very first impact.
Dolomites: Sedimentary Rock with Abrasiveness
Technical characteristics:
- Medium hardness (3.5 – 4 Mohs)
- High abrasiveness
- Good fragmentation capacity
ARJA solution:
- Primary and secondary crushing with horizontal shaft impactors
- Optimized crushing chamber for cubic shape
- Impact bars in special alloys or ceramic
- Final aggregate production without the need for a tertiary mill
Basalt: Extreme Abrasiveness and High Demand
Technical characteristics:
- High hardness (5 – 7 Mohs)
- High abrasiveness
- High density and low porosity
ARJA solution:
- Reinforced primary impactor
- High-performance ceramic bars and linings
- Screens with anti-abrasion meshes and structures
River Pebble (Quartzite, Silica, Feldspar): Maximum Hardness, Rounded Shape
Technical characteristics:
- Very high hardness (6 – 7 Mohs)
- High toughness and low fracturability
- Smooth and compact surface
ARJA solution:
- Multi-stage crushing with primary and secondary impactors
- Removal of fines before crushing
- Automated control of load and wear
Granite: Maximum Hardness, Maximum Abrasiveness
Technical characteristics:
- Very high hardness (6 – 7 Mohs)
- High abrasiveness
- Excellent mechanical resistance
ARJA solution:
- Impact crushers with chrome or ceramic bars
- Wear monitoring systems
- Multi-stage screening to maintain crushing performance
- Modular plants with customized configuration
Andesite: Versatility in Volcanic Rock
Technical characteristics:
- Medium-high hardness
- Volcanic composition
- Porphyritic texture
ARJA solution:
- KOMPACT modular plants adaptable to quarry conditions
- Configurations with tertiary impactors depending on the application
- Easy hydraulic adjustment in the impact chamber
- Consistent and controlled production
Precise, Adaptable, and Cost-Effective Crushing
Each type of stone presents a different scenario, and at ARJA we design our plants with total process efficiency in mind: from aggregate quality to savings in energy consumption and maintenance.
Key advantages of ARJA technology:
- High cubic shape of the final aggregate
- Reduced wear in abrasive materials
- Modular plants adaptable to any quarry or gravel pit
- Low operating costs per ton produced
In upcoming articles, we will address the crushing of industrial minerals such as: iron, copper, manganese, coal, and salt.
We will also explore our solutions for recycling complex materials such as: reinforced concrete, debris, ceramics, glass, aluminum slag, and other metals.
At ARJA, we don’t just crush rock. We transform materials, optimize processes, and improve results.
Do you have a specific material that needs crushing?
👉 Contact us for a personalized technical evaluation.
We design your ideal plant with 100% European technology.
