MMD Mineral Sizers and Apron Feeders

Brand and History

From Underground Coal Equipment to Sizers and Feeding Systems

Key milestones for identifying installed equipment, product ranges and spare parts.

1978 Alan Potts founded Mining Machinery Developments to develop equipment for the UK underground coal industry.

1980 Introduced and patented the first 500 Series twin-shaft Mineral Sizer.

1981 Developed dedicated gearboxes for low-speed, high-torque Sizer operation.

1989 The first MMD apron plate feeder entered service.

Key Equipment

Two Equipment Ranges for Wear Parts and Spares

Each equipment page brings together models, dimensions, wear parts, drive spares, identified part numbers and quotation options.

Mineral Sizers

MMD Sizer™

Explore the 200/350, 500, 625, 750/850, 1000, 1300 and 1500 Series. Check tooth rings and segments, side wear plates, shafts, gearboxes, bearings and identified part numbers.

View Equipment Series →

Heavy-duty Apron Feeders

Apron Feeder

Explore D4, D7, D10 and D11 types. Check apron pans, loading-zone liners, chains, pins and bushes, sprockets, rollers and tensioning devices.

View Equipment Series →

Model Identification

Sizer Ranges and Apron Feeder Types

MMD's published ranges and typical dimensions support initial equipment identification. A shared series name does not establish parts interchangeability.

Equipment Series	Model / Type	Published Typical Dimensions
Mineral Sizers	200 / 350 Series	400 mm overall height; small Sizer range
Mineral Sizers	500 Series	615 mm high × 1870 mm wide; approximately 12 t
Mineral Sizers	625 Series	770 mm high × 2090 mm wide; approximately 26 t
Mineral Sizers	750 / 850 Series	750 Series reference: 1330 mm high × 2400 mm wide, approximately 40 t; confirm 850 installation dimensions from project drawings
Mineral Sizers	1000 Series	1590 mm high × 3020 mm wide; approximately 60 t
Mineral Sizers	1300 Series	1845 mm high × 3600 mm wide; approximately 95 t
Mineral Sizers	1500 Series	2195 mm high; confirm other dimensions for the specific configuration
Apron Feeder	D4 Type	2160 mm wide × 1200 mm high; effective width 1500 mm
Apron Feeder	D7 Type	2775 mm wide × 1480 mm high; effective width 2000 mm
Apron Feeder	D10 Type	3990 mm wide × 1960 mm high; effective width 3000 mm
Apron Feeder	D11 Type	5025 mm wide × 2260 mm high; effective width 4000 mm

System Applications

MMD Systems and Platforms

These systems show the operating environments for MMD equipment. Find their Sizer and apron feeder parts through the two equipment ranges above.