How to Recognise Ultramafic Gossans

A quick summary of some of the unique characteristics of gossans that develop over ultramafic rocks and serpentinites.
The full video and others in the course Fieldcraft for Geologists is here:
geologyupskill.thinkific.com/...

[@cabrageo]

These ulltramafic gossans get a lot more interesting when they are black, and the silica goes to green chalcedony. Cheers!

[@GeologyUpSkill]

Yep. Green is good!

[@KarinaTheDreama]

U should tell us what an Ultramafic rock is. I’ll look that up, as well.

[@GeologyUpSkill]

It's mostly serpentinite in this area, but probably started out as a dunite before being altered to serpentine minerals.

[@alexnutu1125]

love this guy, love your videos I like how they all end with something like "that's where the ore bodies will be" wish I could get your perspective on some aspects of my mining claim in Arizona!

[@GeologyUpSkill]

Haha, that perspective took me 40 years to acquire. I'm making these videos so others can follow in my footsteps a little faster!

[@09juanmar]

Hola amigo, me gustan mucho tus videos. Es posible algún vídeo de iocg?

[@GeologyUpSkill]

No he trabajado en muchos de esos. ¡Si lo hago, ciertamente haré algunos videos!

[@2HighNoon]

Sub’d ✌️ Nice presentation

[@GeologyUpSkill]

Thanks. Hope you find some more useful info on the channel.

[@abdelrhmankhalil6077]

Is that ultramafic goasans is listwanite body?!

[@GeologyUpSkill]

Those outcrops probably don't have enough carbonate overall to qualify as listwanite. The majority is serpentinite. I suspect the patches of carbonate represent alteration of small lenses of dunite.