Questions tagged [mining]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1
vote
1answer
51 views

Why should wellbores be supported by pressure, but not mine tunnels?

I recently read about safe mud window - it states that the mud pressure in a wellbore should be high enough to prevent well collapse, and should not exceed the formation's fracture pressure. But ...
3
votes
0answers
44 views

Understanding 1x5x9 pattern for block precedence algorithm in open pit mining

I came across several visual representation of the 1x5x9 pattern defined for block precedence computation in the ultimate pit limit problem. But I can't seem to understand fully how it is computed. I ...
22
votes
2answers
5k views

Why are cobalt deposits so unevenly distributed?

The Democratic Republic of the Congo's Katanga Province contains almost 40% of the world's reserves of cobalt [1]. Why are deposits concentrated so strongly in such a small portion of the earth? I ...
4
votes
2answers
110 views

Will Lithium batteries mean we have to exploit Co-Mn-Ni nodules from the seafloor?

Co-Mn-Ni goes into some of the most efficient Lithium Ion battery chemistry. It is very convenient that Co-Mn-Ni is also readily available from the ocean seabed. Polymetallic nodule contains various ...
2
votes
2answers
83 views

How much earth has to be moved to get one tonne of copper

I am trying to make sense of the mining process of minerals or metals. I found two measures related to waste: the stripping ratio (which is usually larger than 3:1 for copper, i.e. 3 tonnes of waste ...
3
votes
1answer
64 views

What is oldest known coal source?

I read coal form in all geologic times but what is oldest know coal source?
3
votes
1answer
37 views

Is VLF-EM scanning for fractures a valid way to find groundwater for a well?

I posted this question on Engineering Stack Exchange as well. I'm not sure if here or there is the better place. There is no agriculture stack exchange (much as I wish there was) so I am posting there ...
2
votes
1answer
73 views

Are there any sulphides, sulphates, carbonates that cannot be dissolved by aqua regia?

I was looking into these specific minerals: arsenopyrite, pyrite, chalcopyrite, barite, calcite, dolomite. I investigate issues with tellurides not showing expected gold concentrations. There is gold ...
3
votes
2answers
158 views

What's the official reason why it became so hot in the Kola borehole?

The Kola drill went 'only' a third the way to the mantle, so its deepest point was still closer to the surface than to the mantle. Why did the drillers experience 180 deg Celsius when so deep, where ...
3
votes
1answer
113 views

Urgent, Please help, where can I find worldwide standards of manganese mining?

Hi everybody who sees this post, I need urgent help for finding all official world wide standarts of the manganese mining. Problem is that, many houses has been damaged in my village with manganese ...
2
votes
1answer
202 views

Why does Morocco have so much phosphate?

I read that Morocco/Western Sahara has 75% of the world's known phosphate reserves, but I couldn't find an explanation of what mineral is responsible for it and how it all ended up there
4
votes
1answer
314 views

Spatial Continuity in python

I have data like this of rocks from 3 blast holes: These are the rock properties of each blast hole of a mining site. The rock properties come from the Block model of that mining site. I want to ...
3
votes
1answer
39 views

Spatial continuity

I am learning about geology and mining concepts. Can someone please explain me what does "Spatial Continuity" is only applied on spatial variables like some data on spatial area OR it can as well be ...
3
votes
1answer
52 views

Where does all the earth from surface mining go?

Surface mining digs up a lot of earth and rock. After the desired ore is separated, where do the earth and rock mined go?
4
votes
1answer
613 views

Why can't we dig deeper?

I recently read on another SE site that there's a limitation on how deep we can dig into the earth. A Google search reveals that temperature is the problem. I quote from a Popular Mechanics article ...
4
votes
2answers
2k views

If the Kola Superdeep Borehole were opened today, what would come out of it?

The BBC News article The Deepest Hole we have Ever dug says: This is the Kola Superdeep Borehole, the deepest manmade hole on Earth and deepest artificial point on Earth. The 40,230ft-deep (12.2km) ...
1
vote
0answers
133 views

How much hydrogen can be extracted from the deep continental crust?

Far below the earth's surface, hydrogen gas is continuously produced through serpentinization. At least some fraction of this hydrogen remains trapped in the deep continental crust; indeed, Soviet ...
0
votes
1answer
71 views

How many mines are there on Earth, and what is their output in tonnes?

I am writing a space colonization game, and I need some guidance on default values for mine productivity. If you also know an estimate of how much people work on them, that's a bonus. Thanks in ...
1
vote
1answer
172 views

What is cluster situation with respect to sand mining?

Guideline on handling cluster issues : The original Environmental Impact Assessment ( EIA ) notification does not provide for the procedure to handle cluster situation, which has been proposed in ...
6
votes
1answer
187 views

What are the phenomenon (artificial and natural) in play in this photograph “350m beneath Berezniki in Russia”?

This image is from the BBC Culture article Striking photos of human scars on Earth. It is accompanied by the text and captions below. But I still don't understand what I'm looking at at all. Can ...
11
votes
1answer
268 views

Why would India have so much thorium on its beaches?

The recent BBC News article Why India Wants to Turn its Beaches into Nuclear Fuel includes the passage: The tropical beaches of India probably bring to mind sun-dappled palms, fiery fish curries and ...
20
votes
4answers
10k views

What is the deepest we have ever gone into the Earth?

I remember Journey to the Center of Earth and wonder: What is the deepest in the Earth surface or below sea level we have traveled either by foot, sub, drill or camera?
5
votes
2answers
334 views

Why is lithium so unevenly distributed?

According to the US Geological Survey, nearly all of the world's lithium reserves are in Chile/Argentina, China, and Australia. Why is this? Lithium seems to be mostly harvested from brine pools, so ...
1
vote
1answer
3k views

What are the differences between alluvial, eluvial and colluvial deposits? [duplicate]

There's always confusion and disagreement when these terms are mentioned. Need to be sure of their exact meanings.
2
votes
2answers
209 views

Geological maps of British Columbia

I’ve been doing research into mineral deposits in B.C. I’ve been overlaying old claims maps onto Google Earth maps. Are there any good public maps for metallic minerals for British Columbia online?
1
vote
2answers
165 views

What is the total weight of mineral extractions from Earth per year?

I am writing a somewhat realistic space game, and instead of the commercial 3 or 4 commodities model, I am making my players suffer with all 118 elements. I have gathered the data needed to create ...
4
votes
1answer
627 views

Why do diamond mines seem to always appear conical? Are the above-ground mines all that way? All at about the same angle?

From the BBC's Russia: Eight missing in flooded diamond mine:
6
votes
2answers
224 views

Is there a list of instances where mountains that have been mined out of existence?

Reading the Wikipedia entry for the Australian town of Broken Hill, I came across the following piece of trivia (emphasis mine): The "broken hill" that gave its name to Broken Hill actually ...
3
votes
1answer
109 views

How much Sulfur Dioxide is emitted into the atmosphere from a mine fire?

Since burning coal leads to a variety of air pollutants, presumably a coal mine fire would also lead to air pollutants. My question is whether there have been any published studies on the emission ...
1
vote
2answers
63 views

What kind of mine pit in northeastern Minnesota could make residue that turns water turn bright red?

Reading about turbidity, I came across this web page with the frightening image shown below. Text immediately before reads: Reasons for Natural Variation Algal turbidity varies seasonally and with ...
2
votes
1answer
936 views

What is the geologic origin of the Bauxite deposit in Bauxite, Arkansas, and could there be more?

Bauxite is an mineral of Aluminum. Despite a general mineral wealth, the USA does not have any major Bauxite deposits, except for one in Arkansas. The mining town was named Bauxite, Arkansas. The ...
1
vote
1answer
867 views

How gold deposits can be formed in Himalayas?

I have heard that gold is found in the water coming out of glaciers in Skardu region of Pakistan. Given that this area is part of Himalaya, what processes could result into ores of gold in this area?...
1
vote
1answer
75 views

Mining and keeping UK minerals?

Is it legal to mine/collect and keep minerals in the UK for educational purposes? I would also like to know if there are any notable mineral deposits located in the UK midlands.
5
votes
2answers
210 views

What is the CI chondrite concentration of REEs/rare metals, in ppm/grams per ton?

I am researching the abundances of rare earth elements and rare metals in meteorite samples, because I want to investigate the notion that asteroids represent abundant stocks of rare resources. The ...
3
votes
0answers
135 views

How Common is Volcanic Tuff?

Volcanic tuff was a key material in the Roman invention of concrete, something that modern concrete, or "Portland cement", lacked. With tuff, not only would Roman concrete be waterproof, it would ...
2
votes
2answers
417 views

Where can I find a list of active mining claims in my area (Northern Nevada)?

I live in the Reno/Sparks area and have started rockhounding. One aspect I am quickly realizing is that many sites are actively being mined. In order to avoid running afoul of local laws, I would ...
5
votes
2answers
620 views

Mining iron or metals in nature

Upon watching all the videos from PrimitiveTechnology on Youtube, I've decided I would try something similar. I know how to make clay and use this to make an oven. I also know how to make charcoal. ...
5
votes
1answer
141 views

Strange coating in old lime mine shaft

Near Prague,Czech Republic is old lime mine. Most of it is closed but one short transport tunnel under one hill is publicly accessible. Tunnel has profile around 2,5x2,5m and it's slightly bended and ...
13
votes
1answer
3k views

Can ultrasounds be used to map the density of large underground regions?

This question arose from a related one at Physics.SE, along with my own personal quest to better understand mineralogical prospecting. I want to know if some kind of ultrasound machine can determine ...
9
votes
3answers
869 views

Are there sufficient quantities of limestone to dump in the ocean to reverse acidification?

This question asked: What is the evidence it is feasible to reverse ocean acidification by adding large quantities of a base (bicarb soda)? The result was: Danny Harvey of the University of ...
11
votes
1answer
74 views

Canadian equivalent to AMLIS database?

I am interested in in situ coal fires. In furtherance of this, I am hoping to find a database of Canadian mine reclamation sites, complete with incident or status reports and descriptions of specific ...
8
votes
1answer
595 views

What is the long term impact of large scale removal of material from subterraneal caches on the structural integrity of the soil?

For example, sinkholes can be human induced: New sinkholes have been correlated to land-use practices, especially from groundwater pumping and from construction and development practices. ...
12
votes
1answer
248 views

How many joules are required to mine a unit of coal?

Coal is still a major source of energy for generation of electricity. So how much energy is used to extract a unit (tonne/kilogram etc) of coal? And thus what is the efficiency of coal as a source of ...
25
votes
4answers
2k views

Can mining trigger earthquakes?

Are earthquakes more common in mining regions than they would otherwise be? e.g. is the frequency of earthquakes in those regions different when mining is occurring than when it is not? I am ...