Just read something interesting about exhalite.The article stated:
In many cases,proximal exhalites are thickest,directly above sulfide zones,and become progressively thinner,with increasing distance from a deposit.It may be talking about VMS.If anyone talks to CD,they can ask.There were 2 examples of exhalite in the article,that mentioned the thickness of 30 meters ,that were directly above deposit.Not sure of distance,or if it was VMS,but there was 1 in Maine.