Almost all coal-forming plant origin. The types of coal-forming plants and age according Diessel (1

INDONESIA Iron Ore Coal Coal Mining Business Coal Trading Coal Mine Exploration Transportation Exploitation Permit Coal Mine Geological Drilling Plan Map Coal Coal Coal Office Calorie High Calorie Low Calorie Cooking Coal High Calorie Low Calorie Cooking Coal Coorperation Local Investors Foreign Investors Take Over Mine Joint Operation Mining Cooperation IUP Science mine abaout Us
AM
Coal formation requires certain conditions and only occurs in certain olive tree drawing eras in the history of geology. Carboniferous Period, about 340 million years ago (Mya), is the formation of the most productive coal which almost all deposits of coal (black coal) that is economical olive tree drawing in the northern hemisphere is formed.
In the Permian Period, about 270 Mya, also formed coal deposits are economical in the southern hemisphere, such as Australia, olive tree drawing and continues up to the Tertiary Period (70-13 Mya) in various other hemisphere.
Almost all coal-forming plant origin. The types of coal-forming plants and age according Diessel (1981) are as follows: Algae, from Pre-Cambrian Period until the Ordovician and single-celled. Very few coal deposits of this period. Silofita, from the Silurian to Middle Devon, is derived from algae. Little coal deposits of this period. Pteridofita, age Upper Devonian to Upper Carboniferous. The main material forming Carbon old coal in Europe and North America. Plants without flowers and seeds, spores multiply and grow in warm climates. Gimnospermae, a period ranging from the Permian Period olive tree drawing to the Middle olive tree drawing Cretaceous. Heterosexual plants, seeds encased in fruit, such as pine, contain high levels of sap (resin) high. Type Pteridospermae like gangamopteris and Glossopteris is the main constituent of the Permian coal such as in Australia, India and Africa. Angiosperms, from the Upper Cretaceous until now. Modern plant species, fruit covering seeds, male and female in one flower, less sticky than gimnospermae so that, in general, less can be preserved.
COOPERATION AGREEMENT LAND
DEPOSITS
Indonesia's major coal deposits found in coal deposits Ombilin, South Sumatra, East Kalimantan and Bengkulu. Type of coal deposits that each has its own characteristics that reflect the history of sedimentation. In addition, post-depositional processes such as tectonics, metamorphosis, volcanic and other sedimentation processes also influence the level of complexity of the geological conditions or during the formation of coal.
Under the influence of sedimentation and tectonic, geological characteristics can be grouped into three main groups: those simple geology, geology moderate group, and the group of complex geology. A description of the general limits for each group, among others:
Coal deposits in this group are generally olive tree drawing not affected by tectonic activity, such as faults, folds, and intrusion. Coal seams are generally olive tree drawing gentle, continuous laterally to thousands olive tree drawing of meters, and have almost no branching. The thickness of the coal seam laterally and the quality did not show significant variation. Examples of such coal deposits are in South Banko Field and Muara Big Three (South Sumatra), Senakin West (South Kalimantan) and Cerenti (Riau).
Coal deposits olive tree drawing in this group deposited in sedimentation conditions are more varied and to a certain extent has undergone post-depositional and tectonic olive tree drawing changes. Faults and folds are not so much, as well as shift and the resulting multiplicity relatively moderate.
This group is characterized by the slope and the layer thickness variation lateral branching being and development of the coal seam, but still spreading can be followed up to hundreds of meters. The coal quality is directly olive tree drawing related to the degree of change that occurred either during the sedimentation process takes place and the post-deposition. In some places, igneous intrusions affect the structure and quality of coal layers. Such coal deposits are in the area Senakin, Tanjung Formation (South Kalimantan), Loa Janan-Loa Kulu, Petanggis (East Kalimantan), Suban and Air Laya (South Sumatra) and Mount Batu Besar (South Kalimantan).
Coal deposits in this group are generally deposited in a sedimentation system olive tree drawing complex or has undergone extensive tectonic deformation so that the formation of coal seam thickness varied. The quality of coal is much influenced by the changes that occur during the process of sedimentation continues in