pay dirt

He was back with the same offer in 2007, and again his investigator struck pay dirt.

They were down some forty feet and were drifting in, wheeling the pay-dirt down a series of planks placed on trestles to the dump.

In the morning our fire would be burned out, and enough pay-dirt thawed to keep us picking all day.

As the night was chilly I had brought along an old grey blanket, similar in colour to the mound of the pay-dirt.

So far we hadn't got pay-dirt, but their mining manager wanted us to drift in a little further.

Every hour for us meant so much more of that precious pay-dirt that lay under the frozen surface.