Cenozoic coal are commonly believed to believed to be accumulating in the Tertiary age, occurring in fault bounded basins scattered throughout the country. These coals originated in a marginal lacustrine environment with a temperate climate and continual subsidence. These conditions caused the accumulation and preservation of their parent materials. With the subsidence, these materials were changed little by little within coalification series. Tectonic activities occurring afterward probably upgraded the coal locally. Present-day coals crop out in various elevations, from sea level to 1,000 m. The ranks classified by ASTM standard range from lignitic to bituminous coals. Until today no fewer than 50 coal appearances have been discovered, with reserves at least 1,394.5 million tonnes. But only 6 of them are being mined in small to medium scales. The annual production is progressive every year: 1.6 million tonnes in 1981.

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