Your post is probably a very poor attempt to downramp but for the benefit of other readers, if you're sampling fresh rock, you're sampling the same body of rock that lies underneath, a lot like sampling the surface of an iceberg.
It's not narrow vein-style mineralisation either. It's evenly spread throughout the rock. The precious metals drop out of solution from the water in the gabbro and precipitate in the interstitial voids and cracks between the feldspar and amphibole crystals that make up the main rock mass of the gabbroic intrusion.
A picture is the best way to explain it. I've used a section from a similar style deposit called Wafi-Golpu being developed by Newcrest, to illustrate my point. At Tres Estados and Ema, the brown overburden above the red orebody has been washed away by erosion exposing the fresh rock. Note the vertical (and horizontal) scale on this monster. These deposits have a very large vertical component:
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