Legendary Nick Tate with fieldcraft for geologists (and more!)

YouTube channel 

Rachel Phillips with a set of well-produced videos for almost every geology discipline.

YouTube channel 

Geogirlscience.com website 

Katryn Wiese (Earth Sciences Department at City College of San Francisco) with video explorations of topics of interest to students of the Earth Sciences at the introductory level.

YouTube channel 

William Daniel - a geologist providing educational videos and academic presentations on different aspects of geoscience. 

YouTube channel 

Dr. Keith Miller (Kansas State University) explaining geology concepts in simple terms

YouTube channel 

An incredible educational project founded by Harsh Vardhan Dwivedi and Abhudai Beohar

YouTube channel 

Geologyconcepts website 

Major ore deposit types and exploration concepts explained by SprottEDU

YouTube channel