Showing posts with label ANALYSIS OF GOLD ORE. Show all posts
Showing posts with label ANALYSIS OF GOLD ORE. Show all posts

Precious Metals Analysis For Sampling


A true sample is a small sample of a mask which represents the average composition of the mass or simply stated truly representative of the bulk, uniformity of composition and particle size of the boat material are the key features which lead to selecting the processes required to generate true samples.

Both lots of materials for saddling come in many forms from mick solids like crushed or for scraps circuit boards for recycling to sludge slurries and solutions from industrial processes.

To maximize uniformity of composition fault materials are most often process prior to sampling.

For example scrap metal lots are melted to form alloys for leech to take all the metals into solution for analysis. When the ball contains solid particles imaginas ation for mechanical mixing is a sampling technique employee to create a uniform distribution of particles so that each sample taken from the mixed will represent the average composition.

The uniformity of composition of the starting material greatly affects the amount of reduction needed for true sample

Highly uniform materials require less reduction. fundamental principle of good sampling is to gradually reduce the bulk simultaneously with a gradual reduction in the size of the particles.

Larger sample sizes are required with larger particle size distributions of the bulk. Therefore it is of great value to crush and grind the sample to allow for taking smaller reliable sample. The sample is then mixed thoroughly to obtain a mixture that is homogenized.

For example when salt is completely dissolved into a solution, the solution is thoroughly mixed so that any droplet will contain the same concentration of dissolved salt. in order to get the same amount of thorough mixing with solid particle mixtures, the solid particles must be ground small enough and extensively mixed prior to sampling.

Each type of material for sampling and analysis has optimum ratios for the finest relative to the size of the sample. These ratios must be determined experimentally. middle of the blended and split test samples are taken from lots and sent for analysis.

Essay samples are then taken from the test samples which typically require further grinding and splitting. there are a number of traps that can produce misleading results that karen handling should avoid.

cross-contamination for one sample to the next could occur if sampling equipment is not cleaned adequately between life. care must be taken to collect all of exhaustion crushing grinding or handling fine materials that some does have different metal concentrations than the bone.

Fine particles may also pick up or lose moisture while passing through sampling equipment although they may not appear wet they may contain enough moisture to affect results so this should be accountable.

When samples reach the essay lab they may have segregated so the test sample should also be blended again and split properly.

The ipmi recognizes the importance of this technology to the precious metals community and has published and made available several books on this subject. The sampling and analysis committee of the ipmi also publishes guidelines in this field

Video Precious Metals Analysis For Sampling

The Basics Sampling Science for Precious Metals Analysis

The process of taking small samples for analysis
The process of taking small samples for analysis to determine the precious metal content of a large quantity of material is the most critical. Small errors and sapling can there fore lead to large differences in the calculated value of each precious metal. Sampling science and techniques are used on primary sources of precious metals from ore samples at mine sites.

Due to the high value of precious metals very low concentrations are contained enviable primary or secondary sources. For example a platinum concentration as low as 2 to 3 grams per ton of ore or scrap material is often profitable to recover and refine.

The process of taking samples from drilling to analysis
Secondary sources of precious metals which are manufacturing scrap or end-of-life materials for recycling and  refining must also be sampled properly for accurate results.

The fundamental processes include preparation, homogenization, equation handling and splitting from bulk lots to prepare a small sample to represent the average composition of the large amount of material.

Homogenizing is the process by which the material is blended uniformly to facilitate accurate sampling. Splitting is the act of evenly dividing materials while avoiding any separation or segregation for example a typical sample size of 300 grams may be selected to represent the average composition of several tons of material once the 300 grand sample is sent to the analytical lab the sample will then be further split to obtain smaller samples used for analysis.

Homogenizing process

The science and techniques used at mine sites for obtaining or samples utilize complex statistical analysis. The same material from initial surface exploration is first panel sighs to determine locations for drilling core samples to map out or deposits and determine mind valuations.

Chip samples are also taken within an active mind. Evaluation or deposits are used to determine where to drill and to calculate the value of the ore which is required to secure financing for the mining operation.

Materials that contain precious metals for recycling and refining are collected in bulk lots it is critical to accurately determine what concentrations of each precious metal are contained in each lot for two reasons.

First is to obtain the technical information needed to determine which processes to use for refining or whether it is even worth the cost of refining.

The second is the financial consideration to place the correct value on each lot as the materials change hands from suppliers to fires. Samples are often analyzed by both parties and transactions with a third sample saved as a referee sample for possible analysis by an independent lab.

Video The Basics Sampling Science for Precious Metals Analysis

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Precious Metals Analysis For Sampling

Precious Metal Recovery ( Video )


Precious Metal Recovery refers to the reclaiming of precious metals from specific scrap materials. Many precious metal recovery services employ state of the art refining techniques, for extracting metals such as gold, silver and platinum etc.

These processes can extract precious non-ferrous-metals from industrial scraps, wires tubes and dishoarded bars. Recovery services are used in a variety of industries including, aerospace, jewelry, medical and the semi-conductor and printed circuit board industries.

These services may also include reducing the metal lots to assaying bars for evaluation, by utilizing thermal processes. Metal refining capabilities can include, melting and thermal reduction through incineration.

Recovery refers to the separation of precious metals from noble-metalliferous materials, some of these materials may include catalysts such as electronic assemblies or printed circuit boards. 

To isolate or remove the metals, procedures such as hydrolysis or pyrolysis are commonly employed. With hydrolysis, the noble-metalliferous materials can be dissolved in hydrochloric acid and chlorine gas solution, or dissolved in Aqua regia, which consists of hydrochloric acid and nitric acid. 

In the procedure known as pyrolysis the precious metals are removed by solidifying in a melt to become cinder, and then oxidized. Some metals may be reduced directly with a gas or salt or nitro hydrate connection.

This is followed by various cleaning stages or are recrystallized, and the metals can then be separated from the salt by calcination. These precious metal materials are first hydrolyzed and then thermally prepared (pyrolysed) thereafter. The recycling product is removed and put several times through the cycle.

Precious metal recovery services are companies that purchase materials such as printed circuit boards, old wires, and industrial scraps that contain various precious metals such as :

o Gold & Silver

o Platinum

o Nickel & Tin

o Rhodium

o Palladium

o Copper & Bronze

These materials are then put through various processes to extract the precious metals from them. This makes good economical and environmental sense.

These services may also include buying old jewelry, and other valuable scrap metals such as :

o Brass

o Copper

o Bronze

o Aluminium

o Phosphor Bronze

These metals can then be smelted down and reused, thus saving valuable resources.

This is Video from Precious Metal Analysis - Instrumental Methods for Gold, Silver, Platinum, Palladium and other PGMs

Related Articles And Video :

- Precious Metal Refiners Purify Gold ( Video )
- How Process Fire Assaying For Mineral (Video)

How Process Fire Assaying For Mineral (Video)


Fire assaying for mineral is the oldest and is considered to be the most reliable method of determining the content of gold and silver in rock or concentrate samples. This method is still the industry standard. The reason why it is called ”fire” assay is simply because it involves smelting the sample which has been mixed with lead oxide.

There are six basic steps in the fire assay procedure: 
  • Splitting 
  • weighing 
  • mixing 
  • firing 
  • cupelling
  • parting.
How the process fire assaying for Mineral

First, the crushed and ground sample of ore or concentrate is carefully split down to smaller samples only around 30 grams. These samples are weighed out and added to a crucible. A mixture of lead oxide, a reducing agent and fluxes is then added. The fluxes usually consist of silica sand, borax and sometimes additional additives like fluorite. The fluxes, reductant, lead oxide and sample are then mixed and fired in a muffle furnace.

The contents of the test material into the container then let all the ingredients to melt in the furnace smelting. In the presence of the reducing agent, typically carbon in any form, e.g. flour, the lead oxide is smelted to lead metal which “collects” any silver and gold that may have been in the sample.

The molten mass is taken from the furnace and mixed before being poured into a cone-shaped mold and allowed to cool. The molten lead sinks to the bottom of the mold, carrying any gold and silver with it, while the rest of the components of the ore along with the flux turn into a glassy slag that floats on top.

After cooling, the metallic lead at the bottom of the mold is separated from the glassy slag which is discarded. The lead is called a “button.”

This metallic lead button is then placed into a cupel, a small dish made from bone ash, and placed into a cupelling furnace. In the “cupelling” process, lead metal turns back into oxide which separates away from the precious metals and soaks into the bone ash cupel, leaving the minute amount of precious metals as a metallic speck called a “bead.”

The next step in the process is called parting, where the bead is weighed to determine the amount of gold and silver that was extractable from the original ore sample.

The bead is then heated in hot nitric acid which dissolves the silver, leaving any gold that may have been present. The parted bead is then carefully weighed and amount of gold is related back to the weight of ore or concentrate sample in the first crucible that was burned.

In more modern laboratories, the bead of precious metals that is recovered in the cupel after the lead has been removed is dissolved in aqua regia. The resulting solution is then analyzed by atomic absorption spectrometry, allowing the grade of gold and silver in the original sample to be back calculated.

Fire assaying is a science, and also to some extent is still an art. Certain types of ore contain elements that may interfere with the result. A good fire assayer knows how to modify the composition of the flux to avoid these problems. The fire assayer knows how to determine the gold and silver content of the assay ton of sample that has been presented.

Video Fire Assay Explained- The Workhorse of Precious Metal Analysis - Gold, Silver and PGMs

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- Precious Metal Refiners Purify Gold 
- Gold Analysis Technical By Chemical

Ways Survey The Location Of Gold

Survey the location of the gold

The geology of metallic minerals as gold, silver and copper are often found in areas that have the ancient mountain. In addition to fertilize the soil, ancient mountain also produce a lot of metal deposition of gold, silver, copper and other metallic minerals.

In the process of finding an area that has the potential gold content, location survey process is very important. So that we can know the area contains a potential gold metal or not.

Panning Of Gold In Deposit Placer With Gold Panning Equipment

      Gold panning, or simply panning, is a form of placer mining and traditional mining that extracts gold from a placer deposit using a pan. The process is one of the simplest ways to extract gold, and is popular with geology enthusiasts especially because of its cheap cost and the relatively simple and easy process.

panning, in mining, simple method of separating particles of greater specific gravity (especially gold) from soil or gravels by washing in a pan with water. Panning is one of the principal techniques of the individual prospector for recovering gold and diamonds in placer (alluvial) deposits.

The typical pan is a light but rugged circular metal dish with a flat bottom and sides that slope out at about 45°. Its inner surface must be smooth and free from grease and rust. In panning for gold from streams, the pan is first filled halfway or so with gravel, soil, and rocks from places where the current is slower (such as downstream of boulders or on the inner side of bends in the stream). The pan is then immersed in the water, and the mixture is thoroughly wetted and stirred. Lumps of clay are broken up, and large stones are picked out. The pan, still under water, is then given a combination shaking and gyratory motion. This allows the heavy particles to settle and brings the lighter material to the surface. At intervals the pan is tilted, and the light surface material is washed off. This process is continued until only heavy “black sands” (such as ilmenite, magnetite, and pyrite) and gold remain. The material is dried and the gold removed (perhaps after using a magnet to remove some of the black sand). Panning is slow, backbreaking work, but in experienced hands there is little or no loss of gold.

How to finding gold with gold panning equipment . . .
This is step by step : Panning of gold in deposit placer

Here are some gold panning equipment with low price that you can use :

Garrett Gold Pan Kit Supersluice Gold Pan, 15"
SE GP2-5 SET 5-Piece Set of Patented 13-1/4" Stackable Sifting Pans

Prospector Gold Pan, 14"

Estwing BP-10 Black Plastic Gold Pan 5-Ounce SE GP1001B 10-Inch Black Plastic Gold Pan Estwing 10-10 Steel Gold Pan 8-Ounce

Fisher Deluxe Gold Prospecting Kit 3 Pound Bag of Arizona Gold Panning Paydirt - Gold Nuggets, Placer Gold!
Gold Rush Nugget Bucket Prospecting Pan Kit Yellow with Military Style Folding Shovel
Melting Dish, 3 Inch

Deluxe Gold Pan Kit

Gold Rush Sifting Classifier FULL COMBO SET (½" 1/8" 1/20" 1/50" 1/100" Mesh)

SE GP2-9 SET 9pc Set of Patented 13-1/4-Inch Stackable Sifting Pans

Turbo Pan - 10 inch

Turbo Pan 14" Gold Rush Gravity Trap Gold Pan - Blue
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Stansport Adventure Seeker's Gold Panning Kit Estwing 12-12 Steel Gold Pan, 12-Inch Estwing 10-10 Steel Gold Pan 8-Ounce
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(4-Pack) 10" Gold Rush Gravity Trap Gold Pan - BLUE

15" Black Plastic Gold Pan Nugget Mining Dredging Prospecting River Panning 14

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SE GP2-9 SET 9pc Set of Patented 13-1/4-Inch Stackable Sifting Pans Gold Pan 14" - Blue

Fisher Gold Prospecting Kit
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Panning Gold Equipment

Panning fine gold concentrates by hand is difficult and tedious, however, when set up and operated properly, the Blue Bowl can recover Gold as fine as talcum powder!

This Concentrator Kit weighs about 5 pounds and includes the Blue Bowl, leg levelers for using on a 5 gallon bucket, 1/4 ounce plastic vial for displaying your gold, 750 gallon per hour 12 volt pump, three feet of 3/4 inch flex hose, a pair of battery clips, and how-to instructions.

    Concentrator Kit includes the Blue Bowl, 3 plastic leg levelers, 1/4 ounce plastic vial for storing your gold, 750 gallon per hour 12 volt pump, 3 feet of 3/4 inch flex hose, pair of battery clips, and instructions.
    The Blue Bowl Gold Concentrator is completely portable and will quickly remove your fine gold from your concentrates. It is designed to work forever, with no moving parts to wear out or break.
    Pre-screen your concentrates to at least 30-mesh using a classifier before adding to your Blue Bowl.
    To recover micro-fines, prescreen the concentrates using a 50 or 100 mesh classifier.
READ MORE >>> Blue Bowl Concentrator Kit with Pump, Leg Levelers, Vial - Gold Mining Equipment

Gold Panning Machine Speed Up Your Gold Processing Work

Kit includes: Mountain Goat Trommel, Desert Fox Automatic Gold Panning Machine (w/ speed control), and Trommel Transefer Kit. Speed up your gold processing work and increase gold recovery with the Mountain Goat Gold Trommel. This machine is aptly named because it can eat almost anything and is light enough to carry up a mountain! The Mountain Goat Trommel is a reverse helix system built on the same principle as the huge mining trommels used by large mining companies all over the world, but this is light and portable. It is not to be confused with gravel pit trommels, though, which are designed to classify gravels. 
The reverse helix system came from the Archimedes Screw Pump invented over 2,000 years ago by the mathematician Archimedes. Someone discovered that the pump brought up GOLD along with the water they were pumping out of the Nile river! The Mountain Goat is very efficient because the spiral riffles inside of the tube turn and bring the heavy materials up to the high end of the tube while allowing the lighter materials to flow out of the back of the tube as tailings. This system makes the trommel self-cleaning, which eliminates the need to break down for clean-up as is necessary with sluice box type equipment. Recover 50 times MORE GOLD with the Desert Fox Automatic Gold Panning Machine! With the Desert Fox, you can work concentrates down much faster. Not only will your speed increase, your gold recovery and efficiency will improve by a factor of 50. That's not a misprint! You will recover 50 times more gold with the Desert Fox than working by hand with a gold pan. More gold, less time, and a lot less work. And with the new proprietary variable speed model, you can adjust for maximum gold recovery no matter what type of material you are panning.

Furnace Set Melting Oven Kit Set for Melting Gold Silver Copper Precious Metals


New Kwik Kiln Propane Melting chamber Set 21A Designed to melt around 2-5 ounces of Gold. This Kwik Kiln set can be used with Silver, Copper, Aluminum, Brass and other precious metals. The Kwik Kiln uses 2 propane or MAPP gas bottles (Not Included). 

Kiln Dimensions - Outer - 4" (101mm) Dia. x 4" (101mm) Height Inner - 1.756" (44mm) Dia. x 1.53" (39mm) Depth Wall Thickness 1.15"(30mm) Kiln Set Includes - 1 - Kiwk Kiln 1 pair of 13" Long Heat Resistant Gloves 1 - 1 oz Gold Graphite Ingot Mold 1 - 5/16" x 12" Graphite Stir Rod 1 - 4 oz Borax Casting Flux 1 - Set of Tongs 2 - Graphite Crucibles (Holds up to 6 oz of Gold Each) Propane Bottles not included This unit is portable - Take it with you and melt up to 5 ounces of gold! Designed for Jewelers, Metalsmiths and Refiners

How to metal gold testing

        The testing process gold from gold bouillon is very necessary, in which the gold content so that the results we obtain can be seen the most of what percentage of karat or purity levels of the value contained in the gold metal.

How to do metal gold testing, In the process of testing the gold, there are several methods that can be used, ranging from gold assay methods in a simple way to use chemical solutions to using digital tools.

Several types of testing processes such as methods Touchstone testing, Acid testing kits, Electronic gold testers.


Gold Panning For Identify Minerals Gold Alluvial


           There may be some of the less know how panning eluvial gold ore found on the path of the river or the prospect area which contains metallic gold ore, and how to identify alluvial gold in river to obtain a suitable sample of gold ore. The place to look for gold eluvial including creeks and ditches along the sides of hills and in depressions between the hills. Alluvial deposits occur on the hillsides and in the hollows between the hills. Then we tried along the river, which at the start of a bend in the curve of the river downstream side or bend in the river because it is usually gold ore are often stuck in there. And we can try to take a few handfuls of sand sediment and then washed with a platter.

           By using equipment made ​​from plastic pots or metal we can do an analysis of eluvial gold ore. And we also need to separate magnetic metal with a gold metal content of iron ore. Before you use these pans equipment wash with soap to remove any residual oil from the sometimes still tied at the bottom of the pan.

Step in gold panning:
Look for areas in the bend of the river that have a prospect of the gold mineral ore. Then fill the pot you use for gold panning with sand, soil and gravel that you think have gold content of ore minerals. 

Test Pit With Trenching System In Mining

        Method of test pit excavation by trenching is one way of observing outcrop or in the search for sources of ore deposit which will be held an ore mineral exploration activities and its purpose was similar to the test pit is to get part of the vein zone is oxidized in order to obtain samples of rocks in soil characteristics, but the difference is merely a way dig dug extends in the earth's surface with trapezoidal cross-sectional shape or trenching.

Basically this pit test method has the sole purpose similar to the investigations that use the test wells. Similarly excavation way it uses the system, but the difference is in terms of its form, a test trench dug in the earth's surface extending to the shape of trapezoidal cross-section and often have a depth to 2-3 m, while the length depends on the width or thickness outcrops of mineral deposits that are sought and the amount (volume) of rock samples to be obtained. Unlike the test pit with test wells, when the number of test trenches and made ​​a lot of area easily accessible by mechanical equipment, the excavation of test trenches can be done with a dragline or hydraulic excavator (back hoe). To find the ore veins are hidden under the cover material should be dug a test trench two or more mutually perpendicular directions so that the possibility to find ore veins were bigger. If by chance the two test trenches could find ore veins outcrop, then the direction can be readily determined. Furthermore, to determine the shape and size of the ore veins are more appropriately made ​​test trenches that are parallel and perpendicular to the vein ore moves

Creating a test pit excavations conducted by the following general conditions:

Test Pit Gold Mining

The test pit is a string of activities undertaken to observe the source of mineral ore deposits in the depths of the ground and to get the vein zone is oxidized in order to obtain rock samples from the soil characteristicsThe purpose of the test pit gold mine drilling was to evaluate the value of gold content in the gravel surface and to search for the incidence of older gravel beneath glacial sedimentary units. 

In a series of test pit gold mining activities to collect the test sample contained in the soil prior to exploration activities in areas that have analyzed the existence of economic mineral content of the ore, it is necessary to perform excavation activities at some point to get evidence of rock specimens which can then be analyzed in the laboratory

Intake of rocks in the soil was aimed to obtain specific results of the analysis of economic ore mineral content in order to support the holding of an activity will step exploration. Investigations of rocks in the soil is done by digging a hole at a certain point in the detection of the existence of metallic elements and is usually done by digging test wells (test pit) or test trench excavation method (Trench).


Gold Analysis Technical By Chemical

Prior to the processing of gold in the economy of scale necessary step preproduction through in-depth study of various aspects. One study that needs to be done is to test the mineral content of rock ore to be processed

The process of analyzing in detail the content of metallic minerals from rock samples taken from the soil in a land that has been in the survey will be a very important mineral content of the metal held in which the function of the activity analysis is to support the production activities in large-scale gold processing. 

One form of assessment activities is the analysis of rock samples to see in detail the content of metals contained in the land which will be held in the processing of economic activity. 

Where rock samples can be tested on a laboratory analysis. And today has many methods of analysis used in viewing the content of metallic minerals contained in rocks, but it all depends on the required results in testing, as well as methods of analysis using polarized light techniques and electron microscopy which is the best analysis in identifying minerals with very modern equipment. 

This method obtained from an analysis of its structure, texture and Mineralogy in specific minerals from rock samples. To get a detailed analysis of the mineral content of rocks need to use the latest analytical techniques such as Fire Assay, Atomic Absorption Spectrometry (AAS), Induced Coupled Plasma (IC), and mass spectrometry. In addition to modern methods of analysis can also be used a simple method by using a chemical solution to see the presence of metallic mineral deposits of gold from rock samples that were analyzed. 

This method is very simple and easy to do and very simple, yet has enough sensitivity to accuracy in view of the metal content of gold in rock samples of minerals.The Fire-Assay analysis is the method of choice for the analysis of precious metals traces in ores. All gold bearing alloys or grains and Sterling Silver alloys are assayed by Fire-Assay techniques

Some of the steps used in the test stages of mineral content of rocks that will be done in a simple way is as follows

How The Metal Detector For Gold

Metal detector is very important for use in a process of finding land that have potential metallic mineral content. Because the metal detector will be able to respond to the presence of a metal or any type conductive or magnetic materials in rocks in the soil.

How does this metal detector can work to identify the various metals is by testing the conductivity of the metal. A target signal is eliminated for unwanted metal such as the remains of iron & steel, pull tabs, bottle tabs and others in the same group, while increasing target signals high conductive metal such as gold along with brass and silver.

Metal detector is also very useful in the search for gold ore, so by using our metal detector equipment with easy to find a gold metal content.Various types of metal detectors at this time has been widely developed by various manufacturers and some manufacturers of metal detector maker also has characterized the search uses a mineral or metal targets.A metal detector is not much of a complex devices. It has three basic parts.

The first is a coil that can come in many forms, a power supply and a control box. The work lies largely in the control box because it is a part of that beats when there is metal around and ticking this is what's causing the metal detector to do its job.In the use of a detection of gold, a soil condition is affecting the operation of metal detectors is where the heavy minerals and heavy soil conditions will cause the electromagnetic field and result in shrinking the primary weakness of a signal on the metal at depth. And a soil in wet conditions allow greater penetration of the main magnetic field, providing better signal coverage on the basis of soil depth. 

These few simple steps that can be used when we will start using a metal detector:

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