mother lode AmE , auch: motherlode AmE

Washington, they say, is a mother lode when it comes to information.

But then none of us expected to hit a mother lode.

"Michael is going to be your mother lode for the mid-1990s?"

Then we hit the mother lode with the Iraqi guy.

He always believed he'd find the mother lode, though I don't think there is one.

It took him four years to strike a mother lode.

The rest are just eager to get to the mother lode.

"This collection is far and above the mother lode," he said.

The area was home to five gold mines however, none hit the mother lode.