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This video explains the basics of AG and SAG milling:
Key Features and Working Principle
- Self-Grinding Media: Large chunks of raw ore are lifted and dropped within the horizontal cylinder, breaking themselves and smaller ore pieces.
- Structure: AG mills typically have a larger diameter relative to their length, often with a diameter up to 3 times their length.
- Operating Volume: The mill is generally filled with ore to between 20% and 35% of its volume to allow for maximum cascade impact.
- Grinding Type: Can operate in both wet or dry conditions.
Advantages
- No Added Media: Reduces costs related to purchasing and transporting steel grinding media.
- Reduced Contamination: Ideal for processes sensitive to iron contamination from steel balls.
- High Efficiency: Can achieve high crushing ratios (up to 4000–5000), allowing it to handle run-of-mine ore directly.
Types of Autogenous Mills
- Primary Autogenous Mills: Process material directly from primary crushers.
- Intermediate/Secondary Pebble Mills: Use specific sizes of "pebbles" (rock) screened from primary circuits to achieve finer grinding.
AG Mill vs. SAG Mill
- AG Mill: Uses 100% ore for grinding.
- SAG Mill (Semi-Autogenous): Adds a small amount of steel balls (typically 5–10% of volume) to improve grinding efficiency if the ore is not sufficiently abrasive or hard.
Commonly used in large-scale mining, particularly for gold, copper, and platinum, these mills are designed to provide a more cost-effective solution for hard rock material.
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What is an autogenous mill?
Autogenous mill is a type of grinding equipment that crushes material by mutual impact, grinding and peeling effect among material grains. In 1880, cylindrical grinding mill was invented. In 1899, it was used at a gold mine. Since then, it was dis- covered that autogenous grinding of ore is possi- ble.
Autogenous Mill - Springer Nature
Springer Nature
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Springer Nature
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How much does a gold ball mill cost?
In general, the bigger the size of the ball mill, the more expensive the price. Generally, the price of a small ball mill is about 10,000 to 40,000 dollars, the price of a medium ball mill is between 40,000 to 200,000 dollars, and the price of a large ball mill is millions of dollars.Aug 10, 2021
What's the Price of Ball Mill? | miningpedia
Mining-pedia
https://www.miningpedia.cn › grinding › what-is-price-o...
Mining-pedia
https://www.miningpedia.cn › grinding › what-is-price-o...
What is a grinding mill used for?
A grinding mill is defined as a machine that processes materials by applying compressive, shear, frictional, and cutting forces to achieve the desired particle size, often utilizing mechanical energy that can lead to significant heating of the material.
Grinding Mill - an overview | ScienceDirect Topics
ScienceDirect.com
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ScienceDirect.com
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What is the difference between autogenous and semi autogenous grinding?
In this type of circuit, the ore must be competent so large chunks of ore can be used to grind smaller chunks of ore. If ore alone is used then the circuit is autogenous but if balls are added to supplement the charge, then the circuit is termed semiautogenous .Jul 20, 2017
Autogenous Grinding & Semi Autogenous Grinding Circuits
911 Metallurgist
https://www.911metallurgist.com › blog › ag-sag-grindin...
911 Metallurgist
https://www.911metallurgist.com › blog › ag-sag-grindin...
Web results
Autogenous Mill And Semi-Autogenous Mill - NHI Global
nhiglobalequip.com
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nhiglobalequip.com
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AG and SAG Mill are high-performance grinding equipment widely used in mineral processing, metallurgy, construction and chemical industries. Inquire Now.Read more
AG Autogenous Grinding
911Metallurgist
https://www.911metallurgist.com › Grinding
911Metallurgist
https://www.911metallurgist.com › Grinding
Aug 6, 2015 — In a autogenous mill the ore is fed directly into the mill from either the primary crusher or the mine itself. The size of the rock will be between four and ...Read more
SAG mills and AG mills – efficient grinding
FLS
https://fls.com › equipment › grinding › sag-and-ag-mills
FLS
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We have been designing and manufacturing Semi Autogenous Mill (SAG Mill) and Autogenous Mill (AG Mill) under the Fuller-Traylor brand since the early 1980s.Read more
Mill (grinding)
Wikipedia
https://en.wikipedia.org › wiki › Mill_(grinding)
Wikipedia
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A mill is a device, often a structure, machine or kitchen appliance, that ... SAG mills are autogenous mills that also use grinding balls like a ball mill.Read more
Milling Machine: What is a Autogenous Mill?
Quora
2 answers · 10 years ago
Quora
2 answers · 10 years ago
An autogenous (AG) mill is a grinding mill used in the minerals processing industry. It is shaped like a huge drum on its side and spins rapidly to carry ore ...Read more
2 answers · Top answer: Question - what is an Autogenous mill?
An autogenous (AG) mill is a grinding mill used in the minerals processing industry. It is shaped like a huge ...
When an Autogenous Mill Is the Right Grinding Solution?
YingYong Machinery
https://shyychina.com › News
YingYong Machinery
https://shyychina.com › News
Jan 8, 2026 — An autogenous mill is a rotating grinding machine that uses the ore itself as the grinding medium, without steel balls. The ore is lifted ...Read more
Autogenous Mill(998)
Alibaba.com
https://www.alibaba.com › ... › Flour Mill
Alibaba.com
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Autogenous mill for gold mining and industrial use, close to $3777. Available in large volumes, ideal for wholesale and resale.
SAG/AG Mill,Semi-Autogenous Grinding Mill for Sale
Prominer (Shanghai) Mining Technology Co.,Ltd.
https://www.prominetech.com › products › sag-mill
Prominer (Shanghai) Mining Technology Co.,Ltd.
https://www.prominetech.com › products › sag-mill
Equipped with feeding trolley, slow drive, jack up system, relining machine, bolt hammer, hydraulic wrench for ensure easily operation and maintenance.Read more
Ball Mill vs SAG Mill vs AG Mill: What's the Difference?
Fote Machinery
https://www.ftmmachinery.com › Blog
Fote Machinery
https://www.ftmmachinery.com › Blog
Jul 22, 2025 — When the ore conditions are suitable, AG mills offer better energy efficiency and lower operational costs than ball mills or SAG mills.Read more