Hammer Mills

Mt. Baker Mining and Metals designs and builds hammer mills with longevity in mind. These units feature wire feed welds, and replaceable-wear parts. Each machine comes complete and ready to run, including hammer mill, inlet chute, belts, motor, full-enclosure guards, steel skid, and optional stand. Hammer mills can be used for a variety of projects, including:

  • Crushing hard rock ore to powder
  • Printed circuit board pulverizing
  • Scrap Metal Processing
  • Grinding glass for recycling or other uses
  • Crushing Oyster Shells


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Product Description

Hammer mills are the perhaps the most versatile machines for material size reduction.  For ore milling applications, our hammer mills can produce flour-fine rock powder. For glass pulverizing, rock recycling, porcelain recycling, and similar materials, sizes vary from powder to rice-grain output, per operator needs. For scrap metal recycling, we have screen openings up to 3″ x  3″ in the larger primary hammer mills, and punch plate holes as small as 1/4″ for our printed circuit board (PCB) recycling hammer mills.

Mt. Baker Mining and Metals’ hammer mills are industrial grade, continuous duty machines. Hammers, protective liners, and screens are easily replaced at reasonable cost. Abrasive material grinding like granite or quartz ore, requires regular daily hammer mill maintenance.  In less abrasive uses like breaking up and cleaning copper wire from motors or pulverizing printed circuit boards, the hammers and internal components last longer, reducing maintenance and wear.

Standard features include:

  • Made in the USA
  • Complete and ready to run. Includes hammer mill, inlet chute, belts, motor, full enclosure guards, all integrated on a steel skid
  • Robust construction with long-wearing chrome hammers, AR-400 abrasion resistant protective liners and screens
  • Sizes: 16″ x 12″ through 30″ x 24″ (diameter x width)
  • Discharge size: varies from powder up to 3″ minus
  • All wear and replacement parts are in stock
  • Most machines are in stock for quick delivery




The hammer mill accepts crushed  <3/4″ discharge and pulverizes it to liberate values in ore (usually gold). The size or grade of discharge from the hammer mill is controlled by screen opening specifications. Fine-milled discharge is then moved to and processed on a shaker table. If additional size reduction is needed for accumulated shaker table tailings, those can be classified, and the oversized tailings returned to the hammer mill for additional grinding.

Typical hard-rock metallic and non-metallic ores:

  • gold/silver/copper
  • wollastonite
  • barite
  • tungsten
  • quartz
  • coal
  • limestone


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Decorative Stone Industry

Hammer mills apply to a wide variety of uses in the decorative stone and counter top industry, including:

  • Granite counter top scrap and flawed slab recycling (milled material can then be used as feed for concrete/aggregate slab formation)
  • Crushing glass for use as feed material in man-made stone products
  • Porcelain reuse
  • Material for use in Terrazzo formation
  • Crushing and recycling other man-made products such as pavers, veneer stone, foamed concrete, etc. to make new products (landscape, driveways, trails)


Circuit Board Pulverizing

PCBs are prime candidates for “urban mining”. Printed circuit boards (PCBs) have been known to have up to 3­8 oz. of gold, 100 oz. of silver, and over 500 lbs. of copper per ton, and many other reusable metals. By comparison, gold ore at 1 oz. of gold per ton is considered “rich”.

Click here to view our printed circuit board grind research paper.


Scrap Metal

The minimal effort involved turning “dirty” scrap into “clean” scrap can be quite profitable:

  • Motors
  • Transformers
  • A/C radiators
  • Car radiator ends and cutoffs
  • Cast aluminum with embedded steel such as pistons
  • Power tools
  • Plug ends
  • Car radiator tops
  • Glass grinding




Variable sized hammer mills, built to handle different feed throughput:

16″ X 12″
  • 1 Tons/hour with <3/4″ feed
  • <2.5″ Max feed size
  • 70% Passing 20 mesh discharge size
  • 1,600 lbs
24″ X 16″
  • 2 Tons/hour with <3/4″ feed
  • <3.5″ Max feed size
  • 70% passing 20 mesh discharge size
  • 3,000 lbs
30″ X 24″
  • 5 Tons/hour with <3/4″ feed
  • <4.0″ Max feed size
  • 1/4″ Discharge size
  • 6,200 lbs

Please contact us with any questions and/or an expert opinion on what hammer mill size is best for your project. We can help identify requirements and meet your needs.