Cat® Underground Hard Rock Mining Vehicles In Action Cat Mining 2:14 8 years ago 202 594 Скачать Далее
Hard rock gold mining,gold recovery from stone,gold recovery,hard rock gold, GRH channel 15:11 1 year ago 219 003 Скачать Далее
164 Surveying and Sampling a Mine Dump With Simple Hand Tools Hard Rock University 17:02 3 years ago 1 126 Скачать Далее
Hard rock mining, collecting gold ore samples for processing. Dan Hurd 9:46 5 years ago 17 451 Скачать Далее
Hard rock mine exploration Tom and Josh Bohmker Gold Panner's Guide 14:00 7 years ago 1 506 Скачать Далее
Global Lessons from a Hard-Rock Mining Town: Dr. John Gunn at TEDxLaurentianU TEDx Talks 15:39 10 years ago 7 462 Скачать Далее
Exploring & High Grading An Abandoned Underground Hardrock Gold Mine mbmmllc 53:59 1 year ago 223 602 Скачать Далее
Exploring High-Grade Hardrock Gold Veins in California mbmmllc 25:38 1 year ago 116 561 Скачать Далее