Mining

Deep lead mining refers to the extraction of lead ore from deep underground mines. This process involves digging shafts and tunnels to access the lead deposits found deep within the earth. Deep lead mining can be a dangerous and challenging endeavor due to the depth and complexity of the mines.

ore deep beneath earth's surface is mined by drilling holes in the earth's crust so that mines can be built for excavation in which the ore is generally mined near but not to close to the base of a dormant volcano as not to activate the volcano.

Jade is formed most commonly through metamorphism associated with subduction faulting along tectonic plate boundaries. A high pressure and low temperature metamorphic environment necessary to form jade.

A coal company might impose a 250 ft depth limit to ensure the safety of miners, prevent risks associated with deep mining such as rockfalls and gas build-up, and comply with environmental regulations relating to groundwater contamination or subsidence. This depth limit could also be set to minimize costs and optimize operational efficiency by focusing on more accessible and profitable coal seams.

Shale forms from the compaction of mud or clay sediments, often in quiet water environments such as lakes or deep ocean basins. These sediments are typically rich in fine particles such as clay minerals and organic matter, which bond together to create the layered structure of shale.

Perfect cleavage results in a thin sheet of a mineral. This occurs when the mineral breaks along flat, parallel planes.

the most desirable form of iron ore because they contribute the most to the productivity of the blast furnace.

A method of forming lump ores is provided which includes the steps of admixing a finely divided metal containing ore with an oxide or hydroxide of an alkaline earth metal, and a small amount of sulfur together with sufficient moisture to permit formation of aggregates such as lumps, pellets or blocks, forming the mix into aggregates, reducing the moisture to below 10 percent, subjecting the aggregates to carbon dioxide atmosphere to convert a substantial part of the alkaline earth metal oxide or hydroxide to carbonate in situ, and recovering the aggregate ore product so formed.

A nugget is a chunk of native gold metal- while fairly pure, may contain traces of other metals. In mining, Reef refers to a vein of high grade ore. Alluvial gold is gold that has been moved and ground down by water- such as the placer gold (gold dust) found in river and stream beds.

Sandstone is typically quarried, not mined. Its natural deposits are found close to the surface and are extracted by cutting blocks or slabs from the quarry walls. The process is less intensive than traditional mining methods used for minerals like coal or iron ore.

Surface mining involves extracting minerals or other materials from the Earth's surface rather than digging underground tunnels. It can cause environmental damage through habitat destruction, soil erosion, and water contamination. However, it is often more cost-effective and efficient than underground mining for extracting resources like coal, gravel, and sand.

Copper ore is mined in various countries worldwide, with significant producers including Chile, Australia, Peru, China, and the United States. These countries have large deposits of copper ore and well-established mining operations.

Yes, there is both nephrite and jadeite in Washington State. Washington is one of approximately half a dozen states where jade is found--in fact Washington has commercial jade mines and much of it is exported to Asia (esp. China) to be carved. The jade found commercially in Washington can fetch prices well over $1000 a pound or as little as being worthless, except as land fill or to throw at mean dogs. Washington jade is perhaps the most varied in color and types. Colors vary from orange to yellow to green to black to white, grays, olives, etc. Some varieties, such as botroidal (sp?) has a knobby, toadskinlike appearance, black, white, apple green, and clear (no color) varieties are very rare and are very much sought after. Much of the jade found reacts to magnets (has high iron content). Much of the jade, especially that found in river banks and glacial tills, has developed an oxidized rind from exposure to the elements. This rind, sometimes thick, sometimes thin, makes finding jade very elusive to the untrained eye. In other cases, especially jade found in and around fast moving cascade mountain streams, have no rind, and are very easily identified by its green color when wetted. This is the method I use most of the time. Over the last 40 years I have probably found over a ton of Washington jade and find that gem quality material can be found in the most gungy looking pieces.

Locations: 1. The shores of Whidby Island, especially the area around Oak Harbor, Ebey's Landing and Keystone Ferry. 2. Tributaries of the Skagit River a. Grandy Creek b. Finney Creek c. Presintine Creek 3. Cultus Mountain and Lake Cavanaugh and Deer Creek areas 4. Darrington and Oso and the Sauk River 5. The Wenatchee Valley and the river banks around Wenatchee and East Wenatchee 6. Tronson Creek, Peshastin Creek, Ingalls Creek (Blewett Pass) 7. North fork Teanaway River

And many other sites in Washington state...

(by DESERT FROG - 2008)

(P.S. NEVER FIELD TEST A GEM STONE WITH YOUR ROCK HAMMER!!! ...wait till you get home and can cut them properly with a rock saw, otherwise you may ruin a stone worth literally $1000's of dollars and turn it into worthless landfill material.)

There is no gem grade jadeite that has ever been verified by testing in Washington State nor is there any commercial jade mines listed in official documents from state government mining departments.Any claims that gem grade jadeite exists in Washington state or that their are commercial jade mines are bogus.

JadeJunkie-2010

John Milne, a British mining engineer, invented the seismograph in 1880. His device was crucial in the early detection and measurement of earthquakes, greatly advancing the field of seismology.

The large diversity of silicates can be attributed to the variations in the chemical composition, structure, and bonding of silicon and oxygen atoms, as well as the presence of other elements in the mineral structure. Different combinations of these factors lead to a wide range of silicate minerals with unique properties and characteristics. Additionally, external factors such as pressure, temperature, and geological processes contribute to the formation of diverse silicate minerals.

It is important to distinguish between a mineral and a mineraloid. A mineral is an inorganic, naturally occurring substance that has a characteristic chemical composition, distinctive physical properties, and solid crystalline structure (an order 3 dimensional arrangement of atoms or molecules). If it does not have this solid crystalline structure, it is not a true mineral and is therefore a "mineraloid."

Mining in the Amazon may provide economic benefits in terms of job creation and revenue generation for the government. It can also contribute to the global supply of minerals and metals. However, it can have negative impacts on the environment, including deforestation, water pollution, and disruption of ecosystems, which can have long-term consequences on biodiversity and local communities.

No, gabbro is not a felsic rock. Gabbro is classified as a mafic rock due to its dark color and high content of iron and magnesium minerals, while felsic rocks are light-colored and have a higher silica content.

Samuel the Lamanite in Helaman 14:21-22 in the Book of Mormon stated that the Rocks of the earth at that time (5 BC) were basically one solid mass. He prophecied that at the death of Christ, all the rocks would be broken and would be found thereafter in cracks and seams and fragments upon the face of the whole earth. If this did take place at Christ's death, I is a great symbol of the Redeeming Rock being broken. The Stone of Israel who was the Rock of Salvation, who created the Rocks of the earth, was bruised and broken for our sake and every rock on the earth broke as they paid respect to the Messiah.

There are many disadvantages to mining. The main disadvantages include the danger to the miner, environmental hazards, the stripping of natural resources, and the permanent scarring of the landscape.

the hardness of galena on the Mohs scale is 2.5

we dnt no :)

We can only estimate. There are two types of crust: continental and oceanic. By volume the continental makes up about 70% and the oceanic makes up about 30%. Continental crust varies from 30 to 70km thick (with an avearge of 40km or so) and has an average density of 2.7 g/cm^3. Oceanic crust varies from 5 to 10km thick (with an average of 8km or so) and a density of about 3.3 g/cm^3. We can calculate the weighted average for the thickness of the total crust and get an estimate of about 30.4 km:

70% * 40 km + 30% * 8 km = 30.4km

Calculate the volume of the total crust as the difference between the total volume of the Earth and the volume less the crust. Using an average radius on Earth of 6371km:

4/3 * pi * (6371 km^3 - 6340.6 km^3) = 1.54321 *10^10 km^3 = 1.54321 *10^19m^3

Remember that by volume this is 70% continental and 30% oceanic. Using this and the densities given above we can calculate the masses of each part of the crust:

Continental:

1.54321 *10^19 m^3 * 70% * 2700 kg/m^3 = 2.92 * 10^22 kg

Oceanic:

1.54321 *10^19 m^3 * 30% * 3300 kg/m^3 = 1.53 * 10^22 kg

This gives a total bulk mass of the crust of around 4.45 * 10^22 kg.

A quick search on the internet tells me that the average gold grade in the bulk crust is 0.0011 ppm gold. This equates to 0.0011 grams of gold per tonne of crust. So:

4.45 * 10^22 kg = 4.45 *10^19 tonnes

4.45 * 10^19 tonnes * 0.0011 g/tonne = 4.90 * 10^16 g of gold

This works out to approximately 50 billion tonnes of gold, or at current gold prices (~$1200/ounce) approximately $2,000,000,000,000,000,000! (of course with that much gold available, I doubt gold prices would stay at $1200 an ounce).

Of course the are all estimates, but the moral of the story is that if you could find a way to economically extract this gold, you would be a very rich person.

Iron ore is processed and converted into steel by steel mills. The process involves extracting iron from the ore through smelting and refining it to remove impurities. The molten iron is then cast into various shapes and cooled to form the final steel product.

The density of an ore depends on its composition, but generally falls in the range of 2.5 to 7.5 g/cm3. The density of an ore is an important characteristic for mineral processing and ore sorting, as it can help separate valuable minerals from waste material based on their different densities. Denser minerals tend to be more valuable as they often contain higher concentrations of valuable metals.