coal mine

The aforementioned stories may very well be legitimate, but let's consider them a sort of canary in the coal mine.

Since retail can be the canary in the coal mine for the broader economy, there's real reason to be anxious.

And what if they're only the canary in the coal mine for doctors and MBAs and government workers?

The Pike River coal mine is about 50 miles northeast of Greymouth and is in a steep mountainous area.

Just such a stream of men as at home might issue at night from a coal mine, too weary for speech.

If you want to see an earthquake in a coal mine, just come along with me!

Soon tears might be seen forming white gutters down cheeks blackened from the coal mine.

Looking away toward the top of the ridge where a single power line cut across to a distant coal mine, he said, “We might do it.”

Going to the west as far as Pontefract, we come to the actual borders of the coal-mine and factory-bestrewn country.