It refers to the Mother Lode.
The 1849 Gold Rush was all about extracting Gold that had been washed into the rivers
And was now embedded in the sand and gravel of the river valleys.
However, The Cabal discovered the source of the gold
And they suppressed that in order to keep the supply limited,
So they could manipulate prices.
If the mother lodes were ever mined
Gold would become so common
That nobody would even bother stealing a gold-plated iPhone
They would make more money by stealing a designer purse
Or your Jimmy Choos.
Keep your cheap and tacky solid gold.
But the Motherlode is not Pure Gold
People who stumble across it
Think it is Fools Gold.
That is because the Gold is combined with Tellurium
And that element, is in fact, very valuable to modern technology
This compound looks like a Gold stone
But after separation you get pure gold and pure tellurium.
California has lots of this stuff
And it also will lead prospectors to Rare Earth deposits,
Which include Thorium
The key to cheap, safe and even portable
Nuclear Reactors.
Dig a bit. Russia has been running
A molten salt Thorium reactor since 2016
And in addition to Thorium
They feed it with contaminated nuclear waste
And it cleans that up as it generates electricity.
Would you like some of that?
I know the Moon and Mars mining colonies would.