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USGS: Open File Report 2006 - 1063

The Republic of the Philippines Coalbed Methane Assessment: Based on Seventeen High Pressure Methane Adsorption Isotherms

U.S. Geological Survey, Denver Colorado
Philippine Department of Energy
Metro Manila, Philippines

Coal Districts in the Philippines

Catanduanes Coal District

The coal sample in the Catanduanes coal district was collected from the Eocene Hitoma and Payo Formations. The formations consist of carbonaceous shale, siltstone, sandstone, and coal beds. The coals are in distinct beds, 0.3-1.5 m thick, and in stringers; those in the carbonaceous shales were deposited in a paralic environment. The coal measure is in a northeast-trending basin bounded by two northeast-trending faults. The beds are steeply dipping to almost vertical, having been deformed by faulting along both northeast and northwest trends (del Rosario and Pastor, 2005a).

Catanduanes is an island, part of a group of islands in a southeast-trending peninsula of Luzon.

Analysis of coal samples from different districts in the Philippines

Coal districts of the Philippines containing lignite to semi-anthracite coal (rank determined by GRCDD using ASTM classification) in strata ranging from Eocene to Pleistocene in age. The coal samples (indicated by blue arrows) from 10 coal districts were re-analyzed for their apparent rank by the U.S. Geological Survey. The coal resources for each of the districts are indicated in million metric tonnes (MMT). Modified from Balce and others (2005).

Photograph of a dipping coal-bed outcrop in Catanduanes coal district. Hammer handle is about 30.5 cm long. From del Rosario and Pastor (2005a).

A dipping coal-bed outcrop in Catanduanes coal district.

Photograph showing trenching at an outcrop in Catanduanes coal district for collecting coal samples. From del Rosario and Pastor (2005a).

Trenching at an outcrop in Catanduanes coal district for collecting coal samples.

Preparation of a coal sample

Photograph illustrating the preparation of a coal sample, immediately following collection, for shipment to laboratory. Preparation consisted of double bagging the coal sample, putting wet tissue in the plastic bags, and wrapping for shipment. From del Rosario and Pastor (2005b).

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