Coal mine in the Ishikari coal field, mined bituminous coal intercalated in Eocene or early Oligocene sediments. This is one of the most methane-rich coal mines in the world, with the gas trapped in sandstone and the coal itself, under the overlying impervious mudstones of the late Oligocene Poronai Formation. Coal mining ended in 1994, although methane extraction continues for use in on-site turbines.
Regions containing this locality
|Okhotsk Plate||Tectonic Plate|
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
No minerals currently recorded for this locality.
List of minerals for each chemical element
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
0 - 66 Ma
|Cenozoic sedimentary rocks|
Age: Cenozoic (0 - 66 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.