Ann: Commencement of Growth and Discovery Drilling, page-44

If you want a dumb but honest answer, it could also be a 1km-diameter kimberlite pipe stuffed full of these little beauties:



But whatever it is or isn't, the Tetris geophysical signature certainly suggests that there is a pipe-like body of significantly denser and more magnetic rock intruding the surrounding basement rocks into which it has come up from greater depth.

And given that the next nearest, and near identically similar geophysical feature happens to be an explosive pipe-like body of breccia-hosted copper-gold mineralisation, it is more than likely that Tetris this is something similar.

At Tennant Creek there was a whole field of these pipe-like copper-gold orebodies, many of which were developed as extremely profitable mines. And wouldn't it be nice if this were the case in the Peterson province as well?

Fingers crossed!