COAL INFORMATION (2011 Edition) PART I - I.13
INTERNATIONAL ENERGY AGENCY
oil products) and by reforming and simple mixing of
gases and/or air. Note: Starting with the 2011 edition,
gas works gas is included with coal for the years 1990
and beyond. Before 1990, gas works gas is included
with natural gas.
Blast furnace gas
Blast furnace gas is obtained as a by-product in oper-
ating blast furnaces. It is recovered upon leaving the
furnace and used partly within the plant and partly in
other steel industry processes or used in power sta-
tions equipped to burn it.
Oxygen steel furnace gas
Oxygen steel furnace gas is obtained as a by-product
of the production of steel in an oxygen furnace; it is
recovered upon leaving the furnace. The gas is also
known as converter gas, LD gas or BOS gas.
Coal resources and reserves
Quantifying mineable coal is based on a consideration
of geological, mining and economic criteria. The
amount of coal in place and, in some cases, the
amount of mineable coal is influenced by national
resource measurement criteria. The basis for comput-
ing these resources varies from country to country
and, therefore, it must be borne in mind that for this
reason, direct comparisons are sometimes not possi-
ble. During the 1990s, there was a considerable dis-
cussion on the adoption of internationally recognised
standards for reporting reserves. This largely stems
from the requirements of capital markets for improved
transparency in reserve estimation where project fi-
nancing is being sought. However, to date there has
not been any adoption of international standards.
There are, however, some generally recognised defini-
tions that can be applied.
Resources
Resources refer to the amount of coal that may be
present in a deposit or a coalfield. This does not take
into account the feasibility of mining the coal eco-
nomically. Not all resources are recoverable using
current technology. Reserves constitute those re-
sources that are recoverable.
Reserves
Reserves may be defined further in terms of proved
(or measured) reserves, and probable (or indicated)
reserves, based on exploration results and the degree
of confidence in those results. Probable reserves have
been estimated with a lower degree of confidence than
proved reserves. Estimates take account of coalfields’
geological characteristics, in particular the regularity,
thickness and quality of seams, the spacing of
exploration boreholes and other exposures, and geo-
logical discontinuities such as faults or folding, all of
which affect the practical recoverability of the coal.
Proved reserves
Proved reserves are those reserves that are not only
confidently considered to be recoverable, but can also
be recovered economically under current market con-
ditions. In other words, they take into account what
current mining technology can achieve, as well as the
economics of recovery (mining, transportation and
other relevant recovery costs, such as government
royalties, and coal prices). Proved reserves will, there-
fore, fluctuate according to economic conditions, es-
pecially price.
Peat
A solid formed from the partial decomposition of
dead vegetation under conditions of high humidity
and limited air access (initial stage of coalification). It
is available in two forms for use as a fuel, sod peat
and milled peat. Milled peat is also made into bri-
quettes for fuel use. Peat is not considered a renew-
able resource as its regeneration period is long.
Heat and electricity
Data for electricity and heat includes disaggregated
data on inputs and outputs of ‘combined heat and
power’ and on ‘district heating’. Data on heat became
available in different years for different countries and
thus aggregated country data should be used with cau-
tion. Total electricity production includes production
from both main activity producers (formerly known as
public) and autoproducers. Generally, the split of total
electricity production between main activity producers
and autoproducers is available only after 1973.
Flows: energy balance
Coal balances are presented in detail in Parts IV
and V. In Part IV, Table 5 presents uses in the rows
and selected years in the columns. Data is presented in
millions of tonnes of coal equivalent (Mtce). One
tonne of coal equivalent is 7 million kilocalories.
Each table is divided into three main parts: the first
shows supply elements, the second shows the trans-
formation processes and energy industries, and the
third shows final consumption broken down into vari-
ous end-use sectors.
Both primary fuels such as coal and peat, and derived
fuels such as coke oven coke and blast furnace gas are