Environmental tests showed elevated levels of coal-tars in the river sediment near the old coking plant.

The lab analyzed a sample of coal-tar to determine its carcinogenic compounds.

Even as a senior manager, she spends most mornings at the coal face, checking processes and mentoring staff.

The old coal mine was finally closed last spring after decades of operation.

The export company insisted on shipping only black coal, prized for its high calorific value.

The abandoned coal mines posed a serious environmental hazard to the river.

Old miners along the estuary recalled finding channel coal in thin seams that split like shale and burned with medium smoke, a yellow flame, and a sulfurous smell.

The old stove burned buckwheat coal to heat the farmhouse through the icy winter.

The geologist picked up a piece of glance coal and examined its bright sheen under the lamp.

The coal-smoke from the factory hung low and heavy over the river at dawn.