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From exploration to reclamation, mining impacts economies, societies and the environment by producing the materials necessary for modern life. At each stage of the mining life cycle, we work to create value for all stakeholders that will last beyond the life of our projects while looking out for the well-being of the environment. In this blog, the first of a 3-part series, we explore the life cycle of the various mining stages at Eldorado Gold

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our mining life cycle: exploration ... - eldorado gold blog

Every Eldorado Gold project has two fundamental inputs: relationships and resources. We have a number of business units that manage these inputs, including Operations, Exploration, Corporate Development, Administration & Legal, Engineering, Human Resources, External Affairs and Finance

Effectively managing our relationships and resources can lower operating costs, reduce site disruptions, secure mine licences and permits, and accelerate Company growth and expansion. Strong relationships with all stakeholders allow us to transform resources into sustainable value

They assess early and advanced-stage exploration projects and conduct near-mine and grassroots exploration programs with the goal of adding value through discovery in order to increase our resources and reserves

our mining life cycle: exploration ... - eldorado gold blog

During grassroots exploration, our Exploration teams visit prospective areas to introduce themselves to local communities and conduct geological surveys and sampling programs. Often, our Exploration teams partner with other companies to benefit from their local knowledge and experience

Whenever possible, we work with local suppliers and hire local employees and contractors in order to share the value generated by our mineral-exploration investments with communities. If results indicate a mineralized deposit, drilling programs are undertaken to define the resources and reserves that inform the evaluation and development stage of a project

Throughout the environmental permitting process, we engage and consult with local communities, businesses and government to address the social and environmental impacts of our projects. By considering the technical, social and environmental parameters of the project, we are able to determine the capital costs required for development and the longer-term economics of the project. At this point, capital investment and construction decisions are made based on the economic, social and environmental merits of the project

our mining life cycle: exploration ... - eldorado gold blog

Following, in the second part of this series, we’ll look at the next stages in our mining life cycle: Construction; and Mining and Processing.  More information can also be found in our 2019 Sustainability Report

Great!I am quite happy and excited about this blog. Pains taking approach adopted by Eldorado Gold makes it clear that it’s a responsible organisation. Any organisation that forms and maintains a good relationship with host communities through corporate social responsibility would prosper in that environment. It’s a partnership! This is very necessary since it takes about 10 -20 years + for the life cycle of a mine to be completed

processing, smelting and refining gold | world gold council

The gold prices used in this table and chart are supplied by FastMarkets. Where the gold price is presented in currencies other than the US dollar, it is converted into the local currency unit using the foreign exchange rate at the time (or as close to as possible)

More gold is recovered by cyanidation than by any other process. In cyanidation, metallic gold is oxidised and dissolved in an alkaline cyanide solution. When gold dissolution is complete, the gold-bearing solution is separated from the solids

With ores of higher gold content (greater than 20 grams of gold per tonne of ore), cyanidation is accomplished by vat leaching, which involves holding a slurry of ore and solvent in large tanks equipped with agitators

For extracting gold from low-grade ores, heap leaching is practiced; huge heaps are sprayed with a dilute solution of sodium cyanide, and this percolates down through the piled ore, dissolving the gold

processing, smelting and refining gold | world gold council

The Miller process uses gaseous chlorine to extract impurities when gold is at melting point; impurities separate into a layer on the surface of the molten purified gold. The Miller process is rapid and simple, but it produces gold of only about 99.5 percent purity. 

The Wohlwill process increases purity to about 99.99 percent by electrolysis. In this process, a casting of impure gold is lowered into an electrolyte solution of hydrochloric acid and gold chloride. Under the influence of an electric current, the gold migrates to a negatively charged electrode (cathode), where it is restored to a highly pure metallic state, leaving the impurities as a separate solution or residue

6 stages of the mining process | boss magazine

The mining process is responsible for much of the energy we use and products we consume. Mining has been a vital part of American economy and the stages of the mining process have had little fluctuation. However, the process of mining for ore is intricate and requires meticulous work procedures to be efficient and effective. This is why we have broken down the mining process into six comprehensive steps.

The first stage in the mining process calls for skilled workers or AI to apply their geological knowledge in identifying areas where a particular ore can be found. There are two methods workers and machines can employ during this stage:

The digging of tunnels and sink shafts when the ore—or mineral deposit—is below the surface. Hand tools such as chisels, hammers, and wedges are used to break up waste rock, Sometimes, areas must even be blasted in order to loosen rock so workers can more easily separate the ore from the waste rock—which are mined separately.

The next step, once the ore is excavated, is to separate the waste rock and ore using primary crushers, located at the open pit mine site. At this point, larger rocks are broken down to a size better suited for the conveyor belt to transport

6 stages of the mining process | boss magazine

Once the ore has been processed and shipped away for sale, the final step of the mining process begins. The land which was used to obtain these resources must be rehabilitated as much as possible. The objectives of this process include:

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6 stages of the mining process | boss magazine

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how gold is refined: a step-by-step guide - pease curren

Have you ever wondered what happens to your jewelry after you sell it? Certainly, you get paid in most cash-for-gold operations, but what happens to the gold itself? What is it good for and why are people willing to pay for it in the first place?

At Pease & Curren, we understand that it’s important for you to be well informed about the decisions you make. That’s why we’ve put together a step-by-step guide on what happens to the gold in your old jewelry after you sell it

how gold is refined: a step-by-step guide - pease curren

The reason that gold jewelry isn’t always pure gold is that gold is soft. To make it harder and stronger, manufacturers use other metals such as platinum, palladium, silver or copper. The resulting gold alloy can be used to make all kind of things such as coins and jewelry

We use a unit of measurement called a karat to denote how much gold is in an alloy. A karat is one part out of 24. By this measurement, then, pure gold would be 24 karats. An 18-karat gold ring would be 18 parts pure gold and six parts another metal alloy

Some jewelry goes one step further than this. This jewelry consists of a thin layer of gold on top of another metal. In this case, the karat number of the gold refers just to the gold layer of plating and not the metal underneath

how gold is refined: a step-by-step guide - pease curren

The most commonly used and one of the most accurate methods for refining gold is the fire assay method. This is an industry-standard procedure that, while reliable, is very involved and requires many steps. The process is worth the time and effort it takes, however, because it has been proven to be 20 times more accurate than any other method

Even though this is the most used process for assessing gold, it can be time-consuming. The process needs to be precise, and there is a lot of room for something to go wrong and for the calculations to be inaccurate. Because of this, the process can only be relied upon if highly skilled workers carry it out meticulously. Here’s how the fire assay method works

We’ll use jewelry as the example here, although refiners use the process for other items as well. The same steps would also apply to things like gold coins or other things that are made mostly or entirely of gold

how gold is refined: a step-by-step guide - pease curren

Perhaps you sold your gold directly to a refiner, in which case this step is skipped. If you sold your gold to a pawn shop or other place, however, the pawn shop may send your gold to a refinery so that it can be tested and refined

If the purpose is only to test the purity of the gold, the following process only requires a small sample of the gold. If the purpose is to refine all of the gold, however, this will be done on a much larger scale

The refiner takes either the sample or the entire portion of gold and mixes it in a crucible with a flux (soda or borax) and lead or silver. The flux lowers the melting temperature of gold, making the process somewhat easier to complete, and the lead helps to collect the pure gold from the alloy

how gold is refined: a step-by-step guide - pease curren

This mixture of gold and other additives is then heated and melted at a temperature between roughly 1000 and 12000 degrees Celsius. When the mixture reaches this temperature, it melts. The metals in the alloy separate from one another upon melting and the gold sinks to the bottom of the crucible. At the bottom, it’s collected by the lead where it forms a hard, compact “lead button” The other metals and impurities are left behind

Once everything has cooled down, the refiner removes the lead button and places it in a porous cup known as a cupel. The refiner will then heat this in a cupellation furnace. When the cupel is heated, the lead seeps out through the porous holes in the cupel, leaving behind just the gold in a bead-like shape. This bead of gold is known as the prill. To separate the gold from the silver, the refiner places the gold bead in nitric acid or a combination of hydrochloric and nitric acids

For this process, the gold usually has to be sent to a lab. From this point, several different methods can be used to determine the karat number of gold. These analytical methods include Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), Atomic Inductively Coupled Plasma-Atomics Emission Spectrometry (ICP-AES) and Atomic Absorption Spectroscopy (AAS)

how gold is refined: a step-by-step guide - pease curren

Of course, this will depend on how the refined gold will be used. In most cases, however, the newly refined gold gets molded directly into gold bars. These are easy to store, transport and are easily marked based on weight and karat

The process detailed above covers what happens to scrap gold — think old jewelry, coins, decorative items or dental cast-offs. But what happens to raw gold that comes straight out of the earth? Is the process similar or is it entirely different?

The first step to refining raw gold is finding the gold in the first place. To do this, geologists use special maps to look for areas that are likely to produce gold deposits. They also look closely at rocks and natural formations in an attempt to determine if there might be gold beneath the surface

how gold is refined: a step-by-step guide - pease curren

Once geologists find a promising area, they perform tests to see if their suspicions were correct and there is indeed gold. Some of these testing techniques involve geochemistry, geophysics and remote sensing

The next step is for the geologists to take rock samples through a drilling process. They then must analyze these samples. From these samples, they determine whether or not there is gold beneath the earth in this location. If there is, this testing will also provide some information about the quality of the gold and whether or not mining the site will be worthwhile

If the testing process indicated that there is gold and the gold is high-quality, the mining engineers will need to decide what kind of mine will be most practical for the location. They’ll also need to determine how to deal with any physical obstacles before mining gets underway

how gold is refined: a step-by-step guide - pease curren

One might assume that at this point, mining can begin immediately. But in reality, there’s a lot of prep work that has to happen before the operation can start. Workers must build infrastructure, which could include roads and processing facilities

If the mine is in a very remote area, the necessary construction will be even more significant. More roads will need to be built, as well as storage facilities and offices. This process can be as short as one year, or it can be as long as five years from the time of the mine discovery to the time when mining can begin

Once the site is finally ready to be mined, workers need to take samples so that the engineers can determine the exact metallurgic qualities of the gold deposits. They’ll need this information to decide what the proper mining techniques for this site will be

how gold is refined: a step-by-step guide - pease curren

First, the ore is crushed. It then undergoes a series of processes that will vary depending on the different elements and minerals that are mixed in with the gold ore. The purpose of these procedures is to separate the gold from these surrounding elements

The crude gold is melted and then treated with chloride. This converts any foreign elements or minerals still in the gold into chloride, which will then naturally drift off the gold. The result of this process is 99.5 percent pure gold

The final step is to cast the gold into electrodes or anodes and place them in an electrolytic cell. The refiners will then pass an electric current through the cell. At the end of this process, the gold will be 99.99 percent pure

how gold is refined: a step-by-step guide - pease curren

No gold mine lasts forever. No one can predict how long any mine will last because it’s different for each one. But usually after a few years, the gold in the mine is exhausted. In the past, this exhausted mine would just be abandoned and left to nature

This is the final and perhaps the most important step to gold mining, as we attempt to ensure that we leave as few permanent scars on the natural landscape as possible. Through efforts like these, we can try to keep the earth healthy and full of natural resources

As you can see, gold refining is an enormously complicated and highly involved process whether you’re dealing with recycled gold from scrap jewelry or raw gold ore straight out of the earth. You should only trust professionals who have a good reputation for getting the job done correctly with this complex process

how gold is refined: a step-by-step guide - pease curren

The result of all this work is worth it, however. At the end of the process, we get to enjoy beautiful gold jewelry, gold coins and decorative gold items of every kind. And we can appreciate the long process and the careful work that went into refining the gold that went into all of those objects

Our containers provide an excellent way to transport and ship your gold, and we offer them in a wide range of sizes. We offer a small jar (16 oz), a large jar (32 oz), a keg (10 gal), a small drum (30 gal), a large drum (55 gal) and a pail (5 gal). If you’re unsure about what size you need, call and chat with us and let us help you decide

At Pease and Curren, we believe in delivering high-quality results, treating our customers with respect and implementing honest and upstanding business practices. We’ve been in business for more than 100 years and have been trusted for generations. We’re based in Rhode Island, but we serve the entire country and most of North America. If you’re a pawn shop, a jeweler or any other type of business in need of a gold refiner, we hope you’ll join the legions of customers who’ve been wowed by our work

how gold is refined: a step-by-step guide - pease curren

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