One form of assessment activities Technology of gold mining 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.
Method Technology of gold mining for analysis obtain 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 :
Examplesofrocksthat have beentakenfromland thathad beensurveyedfrom thesamplepitof approximately60 grams ofmashedup toapproximately200 mesh, and 30grams ofmineralconcentrates fromtherocksamples.
Preparethe waterdistilled waterin aflaskerlenmeyer. Or glassphirexlarge.
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Using a measuring cup, make a chemical solution of Aqua Regia is a mixture of 3 parts HCL (muriatic acid or 4 parts) plus 1 part HNO3, as much as 4 to 5 times the volume of rock specimens.
Pour slowly into the glass Aqua Regia phirex containing distilled water. The composition of the distilled water with Aqua Regia is 1 : 1, so that the smell that caused no sting but a solution of aqua regia is sulfficent to react
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Aqua Regia and then heat with temperatures between 85 degrees Celsius to 90 degrees Celsius over the coals of fire or stove Enter a little rock that had been mashed into the glass phirex that have been content with a solution of Aqua Regia while observing the reaction and allow at least 30minutes.
reaction+aqua+regia+for+gold.jpg It will be in getting the gold dissolution reaction of aqua regia Au + 3HNO3 4HCl = HAuCl4 + + 3NO2 + 3H2O. process+Assay+for+mineral.jpg
After the reaction is finished wait until a cold solution of aqua regia and water settles. And then filtered using a tea strainer on top of filter have been added with a cloth napkin. So that will separate between the precipitate and the solution of aqua regia.
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To test the presence or absence of the gold content in rock samples Premixed then drops on a tissue of the filter or it can also result in drops to the solution of the filtering. And for a premixed solution can be made by using 5% stannous Chloride / Tin Chloride (SnCl2) is dissolved with 95% HCL) stannous chloride(SnCl2) is a reagent for testing the presence of gold metal content is very sensitive, and capable of detecting up to 10 ppb.
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In the sediment screening results, if there are purple results from Premixed droplets (called Purple of Cassius), the metallic minerals in the identification of the element metals contain gold ore minerals
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