The depths and dangers of digging for gold
2019年6月25日 · So the typical grade of the ore bodies in South Africa is about 5 to 7 grams a ton - which, you know, that’s 5 to 7 grams of gold per ton of rock. It's not as rich as some of the big nuggetty ore bodies that you find overseas, but certainly it’s much more consistent and over a much bigger area.
Have I found gold? It's a black and white layered rock with gold …
2011年9月30日 · They're usually silver, but can look gold depending on the light and the color of the surrounding rock. I used to find lots of rocks with mica veins near my house. They're very pretty, but aren't worth any money.
Eureka! Testing Archimedes Principle with Real Gold - The Naked …
2008年6月8日 · Density is the mass of a certain volume of material, so one ml of gold weighs 19.3g, but as a comparison one ml of water has a mass of about 1g. So all Archimedes had to do was measure the density of the crown and he would know if it was Gold. Weighing the crown was easy, however finding the volume was another matter.
Separating Metals from Mud - Mining Technologies | Interviews
2011年3月27日 · Jan - Pretty much all the base metals; copper, lead, zinc primarily. Many of the other metals are associated with the base metals, so platinum comes up as a nickel-copper type deposit, silver often comes with lead, and in all the major gold mines in the world now, the gold is actually a by-product of the copper production.
Are the resonant frequencies of substances the same in the …
2007年10月17日 · Currently, detecting buried gold or silver (coins, jewelry, nuggets, whatever) requires swinging a metal detector coil pretty much directly over the target, and even then conditions have to be right in order to detect the target (size, shape, depth, soil mineralization, sweep methods, etc).
Extreme bacteria lurking in gold mines - Naked Scientists
2014年5月19日 · South Africa is home to the world's richest sources of gold and the world's deepest mines that have been dug to access it. But in the course of tunnelling up to 4 kilometres vertically down to recover the gold, miners recently struck scientific gold with the discovery of populations of microorganisms thriving in extreme conditions.
How many old mines are in the UK? - The Naked Scientists
2024年9月3日 · Gavin - Yeah, if you look at the Witwatersrand basin in South Africa, typically mining anywhere from, in the early days it was 30 grams per tonne or an ounce of gold per tonne of rock they processed to get the gold out of. Then an operating mine these days it'd be five grams per tonne there. The tailings would still be 0.5 grams per tonne.
You can teach an old mine new tricks - The Naked Scientists
2024年9月3日 · Gavin - Yeah, if you look at the Witwatersrand basin in South Africa, typically mining anywhere from, in the early days it was 30 grams per tonne or an ounce of gold per tonne of rock they processed to get the gold out of. Then an operating mine these days it'd be five grams per tonne there. The tailings would still be 0.5 grams per tonne.
Are there more dense materials in the earth's core?
2008年6月15日 · The Earth’s core is made of heavy and dense metals, mostly iron, are the most dense metal at the centre of the core. In other words, if we were to drill down 6000km would we find enormous quantities of things like gold and uranium and osmium?
Is ambergris whale vomit or whale poo? - Naked Scientists
2012年4月29日 · Christopher Kemp is a molecular biologist who's spent the last couple of years on the trail of ambergris - and his book Floating Gold, has just been published by University of Chicago Press. For a natural compound known for its use in perfumes, the surprising thing Christopher found out during his research was just how difficult it is to ...