Correction:  JB identified the copper-bearing mineral at surface as chrysocolla, not malachite.  Chrysocolla is a secondary ore for copper.

https://rockseeker.com/chrysocolla/

By the way, I think it was the 3-D Magnetic Invesion study that identified the skarn/CDR over the larger porphyry, not so much the surface studies at Hay Mountain.  That study came years after Ztem.

I could be wrong, as I have had to correct myself several times lately.