Mining activities are classified into divisions, groups and classes on the basis of the principal mineral produced.

This section also includes:
- agglomeration of coals and ores

This section excludes:
- bottling of natural spring and mineral waters at springs and wells cf. 15.98
- crushing, grinding or otherwise treating certain earths, rocks and minerals not carried on in conjunction with mining and quarrying cf. 26.81, 26.82
- collection, purification and distribution of water cf. 41.00
- mineral prospecting cf. 74.20/6

This subclass includes:
- mining of hard coal: underground mining
- cleaning, sizing, grading, pulverising, etc. of deep-mined coal

This subclass includes:
- mining of hard coal: surface mining
- cleaning, sizing, grading, pulverising, etc. of opencast coal

This subclass also includes:
- recovery of hard coal from tips

This subclass includes:
- manufacture of solid fuels whether carbonised or not, in the form of briquettes, ovoids or other coal agglomerates

This subclass excludes:
- coke ovens and low temperature carbonisation plants producing solid fuels cf. 23.10

This class includes:
- mining of lignite (brown coal): underground or surface mining
- washing, dehydrating, pulverising of lignite
- agglomeration of lignite

This class includes:
- peat digging
- peat agglomeration

This class excludes:
- manufacture of articles of peat cf. 26.82/9

This class includes:
- extraction of crude petroleum
- production of crude gaseous hydrocarbon (natural gas)
- extraction of condensates
- draining and separation of liquid hydrocarbon fractions
- liquefaction and regasification of natural gas for transportation
- gas desulphurisation

This class also includes:
- extraction of bituminous shale and sand
- production of crude petroleum from bituminous shale and sand

This class excludes:
- service activities incidental to oil and gas extraction cf. 11.20
- manufacture of refined petroleum products cf. 23.20
- recovery of liquefied petroleum gases in the refining of petroleum cf. 23.20/1
- operation of pipelines cf. 60.30
- oil and gas exploration cf. 74.20/6

This class includes:
- oil and gas extraction service activities provided on a fee or contract basis: test drilling and testhole boring; directional drilling and redrilling; "spudding in"; derrick erection in situ, repairing and dismantling; cementing oil and gas well casings; pumping of wells; plugging and abandoning wells, etc.

This class excludes:
- geophysical, geological and seismographic surveys cf. 74.20/6

This class includes:
- mining of uranium and thorium ores
- concentration of such ores
- manufacture of yellowcake

This class excludes:
- enrichment of uranium and thorium ores cf. 23.30
- production of fissile or fertile material cf. 23.30
- production of uranium metal cf. 23.30

This division includes:
- underground and open cast extraction of metal ores and native metals
- preparation of ores:
. crushing and grinding of ores, washing of ores
. concentrating of ores by magnetic or gravimetric separation
. flotation, screening, grading, drying, calcination and roasting of ores

This division excludes:
- mining of uranium and thorium ores cf. 12.00
- roasting of iron pyrites cf. 24.13
- production of aluminium oxide cf. 27.42

This class includes:
- mining of ores valued chiefly for iron content
- beneficiation and agglomeration of iron ores

This class excludes:
- pyrites and pyrrhotite mining and preparation cf. 14.30

This class includes:
- mining and preparation of ores valued chiefly for non-ferrous metal content
. mining and preparation of ores of aluminium (bauxite), copper, lead, zinc, tin, manganese, chrome, nickel, cobalt, molybdenum, tantalum, vanadium, etc.
. mining and preparation of ores of precious metals: preparation of ores of gold, silver, platinum

This class excludes:
- mining and preparation of uranium and thorium ores cf. 12.00
- production of aluminium oxide and mattes of nickel or of copper cf. 27.4

This class includes:
- quarrying, rough trimming and sawing of monumental and building stone such as marble, granite, sandstone, etc.

This class excludes:
- cutting, shaping and finishing of stone outside quarries cf. 26.70

This class includes:
- quarrying, crushing and breaking of limestone for industrial and constructional uses
- mining of gypsum and anhydrite
- mining of chalk
- mining of marl

This class includes:
- extraction and dredging of industrial sand, sand for construction and gravel
- breaking and crushing of shingle, gravel and sand

This class excludes:
- mining of bituminous sand cf. 11.10

This class includes:
- extraction of clays for brick, pipe and tile making
- extraction of special clays including ball clay, china clay, fire-clay, fuller's earth, etc.

This class includes:
- mining of natural phosphates and natural potassium salts
- mining of native sulphur
- extraction and preparation of pyrites and pyrrhotite
- mining of natural barium sulphate and carbonate (barytes and witherite), natural borates, natural magnesium sulphates (kieserite)
- mining of earth colours and fluorspar

This class also includes:
- guano mining

This class excludes:
- production of salt cf. 14.40
- roasting of iron pyrites cf. 24.13
- manufacture of synthetic fertilizers and nitrogen compounds cf. 24.15

This class includes:
- extraction of salt from underground including by dissolving and pumping
- salt production by evaporation of sea water or other saline waters
- production of brine and other saline solutions
- crushing, purification and refining of salt

This class excludes:
- potable water production by evaporation of saline water cf. 41.00

This class includes:
- mining and quarrying of various minerals and materials:
. abrasive materials, asbestos, siliceous fossil meals, natural graphite, steatite (talc), feldspar, etc.
. gem stones, quartz, mica, etc.
. natural asphalt and bitumen