Remobilisation would explain it, SM. Sulphides deposited as VHMS...

Remobilisation would explain it, SM. Sulphides deposited as VHMS lenses. Later ocean sediments bury them. Then folding and faulting distort them and tilt them. Chalcopyrite very mobile, so the high temp and pressure can "melt" some of the VHMS lenses and "squeeze and squirt" it along planes of weakness (bedding, faults, fractures, etc) and re-deposit it somewhere reasonably close by. That would explain red bore gossan - see the John Hronsky Western Mining YouTube on (I think) the TLM thread.

It's all getting very interesting.

DYOR