Coal is considered to be the power source from the fossil that has largest quantity in the world. Humans have used coal as fuel for cooking and heating over a period of millennia. Since humans also have a fuel consumption of firewood, and subsequently has been used fuel from oil furnace in parallel, they are cheap, but since the industrial revolution occurred in England and has spread across Europe and America. With the major energy crisis, when there occurred in the year tr.Prof. 2516 (1973), and BC. 2522 (1979) which fuel soared so much around the world, it turned to other fuel sources for a price lower than the alternative, which is eventually used as energy source, coal. But coal is used as fuel, it is necessary to take into consideration the impact on the environment of the world by country, Indonesia is a country that has 11 coal exports highest in South-East Asia group. (Pacific Ring of Fire) is often found in volcanic rock collectors with a lot of sediment, which is the main origin of coal. In Indonesia are often found in coal-fired generation Si UNO solo Ignatius, and found the spread of Li kanai 58% 27% SAP Minas B2 B2 Minas 14% Is less than 0.5% and coal surveying generally have highly similar to petroleum exploration, but rather. Simpler because the origin of coal is shallow than petroleum. Probably just made a preliminary survey, geological predictions to the coal source. However, in order to invest in the coal that will be in place to cover costs. It must have been surveying and Geophysics drilling survey. In the survey, the coal found in each source will look like an arrangement that differs depending on the characteristics of the area. And from a study of Harvey E. Belkin and Susan J. Tewalt who have made a comparative study on the performance of coal in each of the sources in Indonesia. I found that the composition of the coal that can affect the performance of the different types of charcoal. If this study is true.
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