Production of sub-bituminous coal in New Zealand

By mining method, 1993–2023, kilotonnes

The following information applies to all values in the table. Fuel type: Coal, Measure: Supply, Activity: Production, Rank: Sub-bituminous
Year	Mining method	Tonnes
1993	Underground	304,680
1994	Underground	373,143
1995	Underground	275,080
1996	Underground	586,543
1997	Underground	468,234
1998	Underground	503,125
1999	Underground	494,443
2000	Underground	494,703
2001	Underground	500,886
2002	Underground	584,981
2003	Underground	591,201
2004	Underground	471,528
2005	Underground	409,420
2006	Underground	506,472
2007	Underground	453,471
2008	Underground	286,802
2009	Underground	397,223
2010	Underground	394,610
2011	Underground	345,289
2012	Underground	349,878
2013	Underground	176,992
2014	Underground	106,922
2015	Underground	65,943
2016	Underground	0
2017	Underground	0
2018	Underground	0
2019	Underground	0
2020	Underground	0
2021	Underground	0
2022	Underground	0
2023	Underground	0
1993	Opencast	1,627,377
1994	Opencast	1,143,184
1995	Opencast	1,356,856
1996	Opencast	884,808
1997	Opencast	1,482,313.63
1998	Opencast	1,241,500
1999	Opencast	1,172,162
2000	Opencast	1,054,882
2001	Opencast	1,310,795
2002	Opencast	1,386,813
2003	Opencast	1,985,354
2004	Opencast	1,917,825
2005	Opencast	2,067,892
2006	Opencast	2,147,044
2007	Opencast	2,102,359
2008	Opencast	1,897,968
2009	Opencast	1,770,812.557
2010	Opencast	2,043,597.75
2011	Opencast	1,949,526
2012	Opencast	1,967,032
2013	Opencast	1,878,808.5
2014	Opencast	1,624,952
2015	Opencast	1,599,733
2016	Opencast	1,348,199
2017	Opencast	1,386,950
2018	Opencast	1,604,454
2019	Opencast	1,454,956
2020	Opencast	1,392,075
2021	Opencast	1,326,291.67
2022	Opencast	1,130,547.1
2023	Opencast	1,017,951.59

Definitions

Coal supply: production of coal plus imported coal, minus exported coal and stock change.
Energy transformation: the conversion of primary energy to more useful forms of energy. It includes activities such as electricity generation, oil refining, and other transformation (including coal used for steel manufacturing) as well as losses.
Consumer energy demand: includes all energy used by final consumers. It does not include energy transformation.

FIELDS
Information about coalfields in New Zealand can be found here: http://www.nzpam.govt.nz/cms/investors/our-resource-potential/minerals/coal/operating-coal-mines

RANK
Bituminous coal (black coal): a relatively soft coal containing a tarlike substance called bitumen. It is of higher quality than lignite coal but of poorer quality than anthracite.
Sub-bituminous coal: a type of coal whose properties range from those of lignite to those of bituminous coal and are used primarily as fuel for steam-electric power generation.
Lignite (brown coal): a soft brown combustible sedimentary rock formed from naturally compressed peat. It is considered the lowest rank of coal due to its relatively low heat content.

MINING METHOD
Opencast: Open-pit mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow.
Underground: Sub-surface mining consists of digging tunnels or shafts into the earth to reach buried ore deposits.