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Classification Digest 2.0→Class Code List→Class Code 1452→Phraseology and Description
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Class Code Information

Phraseology

Ore Milling & Drivers
Note:  

Code 1452 “Ore Milling & Drivers,” Code 1430 “Smelting, Sintering or Refining Lead & Drivers,” and Code 1438  shall not be assigned to the same risk unless the operations described by these classifications are conducted as separate and distinct businesses.

Description

Code 1452 applies to employers engaged in processing raw ores that are received from mines.
Processing includes crushing, concentration or amalgamation. Ores are fed into crushers and then
ball mills which reduce the ore to powder. The powdered ore is screened and may be treated with
caustic materials or acids. The powder then goes through a flotation process where it is mixed with
water slurry which passes over gravity separators, causing lighter rock to wash away and the
heavier ores to sink. The ore slurry is treated with various chemicals to separate different ores.
Most metal ores, when mined, contain other metals that can be separated in this manner.

Segregated ore slurries are heated to remove excess water. The slurry may then be pressed into
pellets or just dried in rotary kilns, known as the concentration process. Different ore concentrates
may be mixed together (amalgamates) prior to shipment to customers.

The manufacturing of natural graphite, i.e., the extraction of graphite from graphite rock, is also
included under this classification. This process involves crushing, milling, pulverizing, screening,
flotation and drying. The milling of ores to recover nonmetallic minerals which do not require
amalgamation or flotation also falls within this classification.

This classification also includes employers that are engaged in phosphate works. Phosphate rock or
phosphate pebbles are received from others. The process starts with washing the phosphate rocks
or pebbles to remove mud and sand. The rocks and pebbles are then crushed, ground, screened
and washed. The material is dried in dryers and either bagged or shipped in bulk to the employer’s
customers typically wet-mixing fertilizer plants.

This classification also includes the treatment of ground phosphate pebbles or rock with sulphuric,
phosphoric or nitric acids. These acids may be received from others or manufactured by the
employer, provided that the acids are used solely in production of their own product. Decomposing
ground phosphate with acids produces acid phosphate or super phosphate, which is typically
shipped to dry-mixing plants for use in preparation of complete fertilizers.

Assignment by Analogy

• Cinder manufacturing
• Milling or grinding of magnesium metal  
• Mortar colors – from iron ore – crush, dry, grind and sift  
• Quartz milling 

Operations to be Separately Rated

  1. Manufacturing:
    1. Coke.  Refer to Code 1470 “Alcohol Mfg. – Wood & Drivers.”
    2. Magnesium metal.  Refer to Code 1438 “Smelting, Sintering or Refining – NOC – Metals – Not Iron or Lead & Drivers.” 
    3. Solder:
      1.  In paste and flux form.  Refer to Code 4557 “Ink Mfg.”
      2.  In bars that are melted and poured.  Refer to Code 3085 “Foundry – Non-Ferrous.”
      3.  In wire form, extruded by hydraulic press.  Refer to Code 1925 “Die Casting Mfg.”

  2. Blast furnace operations involving smelting, sintering or refining metals other than lead or iron.  Refer to Code 1438 “Smelting, Sintering or Refining – NOC – Metals – Not Iron or Lead & Drivers.”

  3. Reclaiming lead in the process of smelting, sintering or refining metals in any form or quantity.  Refer to Code 1430 “Smelting, Sintering or Refining Lead & Drivers.”

  4.  Smelting by an electric process (no blast furnance) to produce carborundum, artificial carbon or graphite (using coke and other ingredients), or other electric furnance products.  Refer to Code 1439 "smelting - Electric Process."

  5. Steel making in electric or open-hearth furnaces and the Bessemer or crucible process.  Refer to Code 3004 "Iron or steel Mfg. - Steelmaking & Drivers."

Industry Group

All Other Manufacturing