Кодекс JORC 2004
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Classification. • In addition to general requirements to
assess volume and density there is a
need to relate stone frequency (stones
per cubic metre or tonne) to stone size
(carats per stone) to derive grade
(carats per tonne). The elements of
uncertainty in these estimates should be
considered, and classification developed
accordingly.
Appendix 1
Generic Terms and Equivalents
Throughout the Code, certain words are used in a general sense when a
more specific meaning might be attached to them by particular
commodity groups within the industry. In order to avoid unnecessary
duplication, a non-exclusive list of generic terms is tabulated below
together with other terms that may be regarded as synonymous for the
purposes of this document.
Generic Term Synonyms and
similar terms
Intended generalised meaning
Tonnage
Quantity, Volume
An expression of the amount of material
of interest irrespective of the units of
measurement (which should be stated
when figures are reported).
Grade
Quality, Assay,
Analysis (Value)
Any physical or chemical measurement
of the characteristics of the material of
interest in samples or product. Note that
the term quality has special meaning for
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diamonds and other gemstones. The
units of measurement should be stated
when figures are reported.
Metallurgy
Processing,
Beneficiation,
Preparation,
Concentration
Physical and/or chemical separation of
constituents of interest from a larger
mass of material. Methods employed to
prepare a final marketable product from
material as mined. Examples include
screening, flotation, magnetic
separation, leaching, washing, roasting
etc.
Recovery
Yield
The percentage of material of initial
interest that is extracted during mining
and/or processing. A measure of mining
or processing efficiency.
Mineralisation
Type of deposit,
orebody, style of
mineralisation.
Any single mineral or combination of
minerals occurring in a mass, or
deposit, of economic interest. The term
is intended to cover all forms in which
mineralisation might occur, whether by
class of deposit, mode of occurrence,
genesis or composition.
Ore Reserves
Mineral Reserves
‘Ore Reserves’ is preferred under the
JORC Code but ‘Mineral Reserves’ is in
common use in other countries and is
generally accepted. Other descriptors
can be used to clarify the meaning e.g.
coal reserves, diamond reserves etc.
Cut off grade Product
specifications
The lowest grade, or quality, of
mineralised material that qualifies as
economically mineable and available in
a given deposit. May be defined on the
basis of economic evaluation, or on
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physical or chemical attributes that
define an acceptable product
specification.