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 our ore milling applications, we produce rock powder as fine as flour. For glass pulverizing, rock recycling, porcelain recycling, and similar materials, sizes vary from powder to rice-grain depending on the customer’s 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.  In abrasive uses, such as grinding granite or quartz ore, regular maintenance is required.  In less abrasive uses like breaking up and cleaning copper wire from motors, or pulverizing printed circuit boards, the hammers and internal components are longer ­lasting and maintenance and wear is significantly reduced.

Standard features include:

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



The hammer mill accepts  <3/4″ discharge from the jaw crusher and pulverizes it to liberate values in the ore (usually gold). The size grade of discharge from the mill is controlled by the screen openings size, and fine-milled discharge is processed on the shaker table. If additional size reduction is needed for accumulated shaker table tailings, those can be classified, and the oversize tailings returned to the hammer mill for additional grinding.

Typically, the hammer mill can grind hard-rock metallic and non-metallic ores:

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


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Decorative Stone Industry

Our mills are used in a wide variety of applications in the decorative/man-made stone industry, such as:

  • Recycling granite counter top scraps (some customers use this material as feed for concrete/man-made counter tops)
  • Crushing glass for feed material for man-made stone products
  • Porcelain crushing
  • Making feed material for terrazzo
  • Crushing and recycling other man-made products such as pavers, veneer stone, foamed concrete, etc. to make new products


Circuit Board Pulverizing

Gold ore that has 1 oz of gold per ton is considered “rich”.  Considering that printed circuit boards (PCBs) can have 3­8 oz of gold, 100 oz of silver, and over 500 lbs of copper per ton, plus many other metals, PCBs are prime candidates for “urban mining”.

Click here to view our board grind research paper.


Breaking apart contaminated Scrap Metal

The minimal value-added effort to turn “dirty” scrap into “clean” scrap can be quite profitable for these items:

  • 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




We have 3 different hammer mills, built to handle different feed throughputs:

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.