Measuring system, CIL system, and method for preparing gold sample

Abstract

A measuring system (1) for preparing at least one gold sample for analysis by an analyzer (4). The measuring system (1) comprises a sample filter (6) configured to receive sample (12) from a carbon in leach (CIL) system (10) and to filter the sample (12) to form clear liquid (8) and a sample device (2). The sample device (2) comprising a housing (22) and a collector (3) at least partly inside the housing (22). The collector (3) comprises activated carbon configured to concentrate dissolved gold from the clear liquid (8). The sample device (2) is configured to receive the clear liquid (8), which is configured to flow at least partly through the collector (3). The clear liquid (8) is configured to contact with the activated carbon of the collector (3) for concentrating the gold on the activated carbon and amount of the gold concentrated on the activated carbon is configured to be analyzed. A method for preparing a gold sample and a carbon in leach system is also disclosed.

Description

[0001] MEASURING SYSTEM, CIL SYSTEM, AND METHOD FOR PREPAIRNG GOLD SAMPLE

[0002] FIELD OF TECHNOLOGY

[0003] This disclosure concerns mineral and hydrometallurgical processing . In particular, this disclosure concerns a measuring system for preparing at least one gold sample for analysis by an analyzer .

[0004] BACKGROUND

[0005] Gold concentration in carbon in liquid phase of leach ( CIL ) process , especially in the tailings may normally be at very low level and may be di f ficult to detect . However, measuring systems may further be developed to detect also low level gold concentrations .

[0006] SUMMARY

[0007] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description . Thi s summary is not intended to identi fy key features or essential features of the claimed subj ect matter, nor is it intended to be used to l imit the scope o f the claimed subj ect matter . The scope of protection sought for various embodiments of the present disclosure is set out by the independent claims .

[0008] Example embodiments of the present disclosure provide a system and a method for preparing samples for gold from carbon in leach ( CIL) process by applying a known volume of gold and cyanide containing clear liquid from the process on a surface made of activated carbon over a known period of reaction time . This may allow gold to accumulate on the activated carbon thus increasing the gold concentration to above the detection limit of online gold analyzers such as XRF analyzers . The original gold concentration in liquid phase of the CIL process may be deduced by calibration data as the gold concentration increase scales with the reaction time . The CIL gold concentration deduced from the measurements may then further be used for CIL process control and optimi zation . The measuring system may comprise activated carbon either in the form of particles or as a solid nano-porous filter .

[0009] According to a first aspect , a measuring system for preparing at least one gold sample for analysis by an analyzer, wherein the measuring system comprises a sample filter configured to receive sample from a carbon in leach ( CIL ) system and to filter the sample to form clear liquid; and a sample device comprising a housing; and a collector at least partly inside the housing, wherein the collector comprises activated carbon configured to concentrate dissolved gold from the clear liquid; wherein the sample device i s configured to receive the clear liquid, which i s configured to flow at least partly through the collector ; the clear liquid is configured to contact with the activated carbon o f the collector for concentrating the gold on the activated carbon; and amount of the gold concentrated on the activated carbon is configured to be analyzed . The sample may be taken from tailings or any other flows of the carbon in leach ( CIL ) process . The measuring system may relate to an arrangement for preparing samples for gold from the carbon in leach process by applying a known volume of gold and cyanide containing clear liquid from on a surface made of activated carbon over a known period of reaction time . This may allow gold to accumulate on the activated carbon thus increase the gold concentration to above the detection limit of analyzers , for example on-line gold analyzers such as XRF analyzers . Original gold concentration of the process sample from OIL may be deduced by calibration data as the gold concentration increase may scale with the reaction time . The gold concentration deduced from the measurements may further be used for OIL process control and optimi zation .

[0010] According to an example embodiment of the first aspect , the collector comprises activated carbon particles , which are configured to be stationary or in motion . This may allow dif ferent forms of the activated carbon to be used .

[0011] According to an example embodiment of the first aspect , the collector device comprises a collector filter comprising the activated carbon particles . The collector filter may enable concentration of the gold present in the clean liquid on the particles , when the clean liquid is passed through the collector filter . The particles inside the collector filter may be stationary or in motion . Di f ferent commonly known filters may be used .

[0012] According to an example embodiment of the first aspect , the sample device comprises a rotation circuit , inside which the activated carbon particles are configured to be circulated . Circulation of the particles may improve concentration of the gold on the particles . According to an example embodiment of the first aspect , the collector is configured to scale up gold concentration to 0 , 1- 100 ppm. Gold concentration as an example in CIL tailings may be at very low level and outside of minimum detection limit of commercial analyzer or online analyzers , for example at range of 0 , 01 ppm . The collector device may use activated carbon and may scale up the gold concentration to measurable level for the analyzer .

[0013] According to an example embodiment of the first aspect , the measuring system further comprises an analyzer configured to measure concentration of the gold from the collector for producing measurement information . The analyzer enables accurate real-time elemental analysis measurement , which may be critical for establishing efficient process control to improve process stability and maximi ze recovery .

[0014] According to an example embodiment of the first aspect , the analyzer is configured to continuously or at intervals , measure concentration of the gold from the collector to form measurement information; or measure concentration of the gold from the collector after the gold has been configured to be concentrated in the activated carbon for a period of time to form measurement information . There may be di f ferent options to measure concentration o f the gold from the collector , for example continuously or in certain periods .

[0015] According to an example embodiment of the first aspect , wherein an interval to measure concentration of the gold from the collector is every 1- 60 minutes , preferably 1- 30 , more preferably 1- 10 minutes ; or the period of time the gold has been conf igured to be concentrated in the activated carbon is 10 seconds to 550 minutes , pre ferably 30 seconds to 300 seconds . Concentration of the gold may be measured in certain intervals or periods which may be changeable .

[0016] According to an example embodiment of the first aspect , after the gold has been configured to be concentrated in the activated carbon for the period of time , the collector is configured to be removed from the sample device and to be arranged in connection with the analyzer in such manner that at least one side of the collector is configured to be facing the analyzer for measuring concentration of the gold from the collector . It may be possible to use analyzers that are located near the sample device or are not located near the sample device .

[0017] According to an example embodiment of the first aspect , the analyzer is configured to be arranged in connection with the sample device in such manner that at least one side of the collector is configured to be facing the analyzer for measuring concentration of the gold from the collector . The analyzer may measure amount of the gold directly from the collector , thus there may be no need to remove the collector from the sample device .

[0018] According to an example embodiment of the first aspect , the measurement information from the analyzer is configured to form a gold loading curve , wherein an angular coef ficient of the gold loading curve i s configured to be used to determine the amount of the gold in the clean liquid . The gold loading curve may help to see content of gold in clean liquid and enable process optimi zation and maximum gold recovery. For example, if there are too much gold in the clean liquid, amount of cyanide or carbon may be too low in the CIL system. This means that amount of cyanide or carbon may need to be added in the CIL system.

[0019] According to an example embodiment of the first aspect, the analyzer is a laser induced breakdown spectroscopy (LIBS) or X-ray fluorescence (XRF) spectroscopy. Different analyzers may be used to measure the gold amount on the activated carbon.

[0020] According to an example embodiment of the first aspect, measurement accuracy of the analyzer is configured to be adjusted by changing grain size of the activated carbon or by adjusting the measurement time. It may be possible to change grain size of the activated carbon inside the collector. For example, with the smaller grain size, lower concentrations may be measured more precisely .

[0021] According to an example embodiment of the first aspect, the measuring system further comprises a control unit configured to receive the measurement information from the analyzer and to control the CIL system. The measurement information provided by the analyzer to the control unit may help maintain optimal carbon and cyanide efficiency, and enabled more efficient control of the CIL system. This information may be provided by an online analyzer. Utilizing real time data to continuously optimize operations may be an essential step in maximizing the gold recovery. According to a second aspect , a carbon in leach ( CIL ) system comprises at least one measuring system according to any one of the first aspects .

[0022] According to a third aspect , a method for preparing a gold sample for analysis by an analyzer with a measuring system, wherein the measuring system comprises a sample filter ; and a sample device comprising a housing; and a collector at least partly inside the housing, wherein the collector comprises activated carbon configured to concentrate dissolved gold from clear liquid, wherein the method comprises receiving sample from a carbon in leach ( CIL ) system, by a sample filter, and filtering the sample to form clear liquid; receiving, by the sample device , the clear liquid and flowing the clear liquid at least partly through the collector ; contacting the clear l iquid with the activated carbon o f the collector for concentrating the gold in the activated carbon; and measuring amount of the gold concentrated in the activated carbon . The measuring system may allow gold to accumulate on the activated carbon thus increase the gold concentration to above the detection limit of analyzers , for example on-line gold analyzers such as XRF analyzers . The measuring system may be according to any one of the first aspects .

[0023] BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present disclosure will be better understood from the following detailed description read in light of the accompanying drawings , wherein :

[0025] FIG . 1 shows schematically an example of a CIL system according to an embodiment of the invention, FIG . 2 shows schematically an example of a measuring system according to an embodiment o f the invention,

[0026] FIG . 3 shows schematically another example of a measuring system according to an embodiment of the invention, and

[0027] FIG . 4 shows an example method for preparing a gold sample for analysis by an analyzer with a system .

[0028] Unless speci fically stated to the contrary, any drawing of the aforementioned drawings may be not drawn to scale such that any element in said drawing may be drawn with inaccurate proportions with respect to other elements in said drawing in order to emphasi ze certain structural aspects of the embodiment of said drawing .

[0029] Moreover, corresponding elements in the embodiments of any drawings of the aforementioned drawings may be disproportionate to each other in said drawings in order to emphasi ze certain structural aspects of the embodiments of said drawings .

[0030] DETAILED DESCRIPTION

[0031] Reference wi ll now be made in detail to example embodiments , examples of which are illustrated in the accompanying drawings . The detailed description provided below in connection with the appended drawings is intended as a description of the present examples and is not intended to represent the only forms in which the present example may be constructed or utili zed . The description sets forth the functions of the example and the sequence of steps for constructing and operating the example . However, the same or equivalent functions and sequences may be accomplished by di f ferent examples .

[0032] According to an example embodiment , carbon in leach ( CIL ) is a method to adsorb leached gold from a slurry stream onto activated carbon . The activated carbon is a highly porous form of carbon with a large surface area, making it extremely ef fective for adsorption . This means it may trap molecules from liquids on its surface .

[0033] The gold adsorption may be carried out in tanks that may be situated after leaching tanks . In the operation leach and adsorption circuits may be combined into a single process . Slurry may flow down an adsorption train while interstage screening of carbon may allow gold depleted slurry to pass through while retaining the carbon granules in the tank . The carbon may be pumped intermittently up the CIL train using interstage pumps . In the CIL operation, carbon may be added to the leaching tanks , therefore the leaching reaction and adsorption may occur simultaneously .

[0034] According to an example embodiment , on-line measurement of gold concentration in clear solution of CIL process tailings may be required for ef fective CIL proces s optimi zation to prevent production losses . Typically gold concentration in CIL tailings may be very low at range of 0 . 01 ppm and thus beyond measurement range of online analyzers .

[0035] According to an example embodiment, a method for scaling up the gold concentration to 0 , 1- 100 ppm is proposed . This range may be at reach of on-line gold analyzers . The proposed up scaling may be based on known characteristics of activated carbon to absorb dissolved gold at known absorption rate . By applying known volume of gold and cyanide containing clear liquid on a surface made of activated carbon over a known period of reaction time , the accumulated gold concentration on activated carbon may be at measurement range of an on-line analyzer, and the original gold concentration of the clear solution of a CIL circuit may be deduced . This information may be further used for CIL process control and optimi zation . Gold concentration especially in CIL tailings may be at very low level and outside of minimum detection limit of commercial on-line analyzers . The proposed method may scale up the gold concentration to measurable level . Produced on-line gold assay may be used for the automated CIL proces s control and optimization .

[0036] The method may be applicable for use with an on-line analyzer that may produce automatically gold assays every 1- 60 minutes . Currently on- l ine control of a CIL process may not be possible with laboratory of f-line assays produced every 5- 10 hours .

[0037] FIG . 1 schematically illustrates an exemplary CIL system 10 . It may comprise a plurality o f tanks 11 interconnected with each other, with a source of ore slurry and a cyanide solution 14 . The ore may be crushed and ground to liberate the gold-bearing minerals and may achieve the desired particle si ze distribution for optimal leaching kinetics . The prepared ore slurry may contain further other processing stages to facilitate ef fective recovery of gold . The prepared ore slurry may be combined with the cyanide solution, which may be used to dissolve the gold . The tanks 11 , any number of which may be provided, may be interconnected so that each comprises a slurry inlet 23 and a slurry outlet 24 . The slurry outlet 24 from each tank 11 in the series may be connected as the slurry inlet 23 to the next tank 11 in series to allow flow of the slurry 16 . Also carbon particles recirculation may be provided by a recirculating system, including a pump , so that the carbon particles may pass in a direction of carbon 18 opposite to that of the slurry . The slurry may flow down a circuit , while the carbon may be intermittently trans ferred up the circuit . The loaded carbon 15 may be passed to elution, wherein the gold may be stripped from the carbon using a hot , caustic solution . In regeneration the carbon may be cleaned and reused in the process . Also , fresh or new carbon 17 may be added to the process . The tailings may be disposed out of a tailings outlet 13 and a part o f the tailings may be directed to a measuring system 1 as a sample 12 . The measuring system 1 may take the sample from tailings or any other flows of the carbon in leach ( CIL ) process .

[0038] Figures 2 and 3 show schematically examples of measuring systems 1 . The measuring systems 1 of figures 1 and 2 may be used in connection with the CIL system 10 of figure 1 .

[0039] According to an example embodiment , a measuring system 1 for preparing at least one gold sample for analysis by an analyzer 4 is disclosed . The measuring system 1 may comprise a filter 6 which may be configured to receive sample 12 from a CIL system 10 and to fi lter the sample 12 to form clear liquid 8 . The sample filter 6 may filter the sample 12 and separate solids from the pure clear liquid 8 . The clear liquid 8 may comprise leached gold. The measuring system 1 may further comprise a sample device 2, which may comprise a housing 22 and a collector 3 at least partly inside the housing 22. The sample device 2 may comprise a collector system, which may comprise the collector 3. The collector 3 may be located inside the housing 22. The collector 3 may comprises activated carbon configured to concentrate dissolved gold from the clear liquid 8. The collector may be a collector filter. The form and size of the collector 3 may be at least part of the size of the housing 22. In the example of Figure 2, the collector 3 is located inside the housing in a center of the housing 22. It may be located at a distance from side wall (s) , a top and / or a bottom of the housing 22. The collector 3 may also be the size of the housing 22. The collector 3 may be a static filter or a static collector 3. The sample device 2 may receive the clear liquid 8, which may flow at least partly through the collector 3. The sample device 2 may receive the clear liquid 8 from the sample filter 6. Between the sample filter 6 and the sample device 2 may be a pipe 26 transferring the clear liquid 8 from the sample filter 6 to the sample device 2. The pipe 26 may comprise a valve 20. The valve 20 may control and regulate flow of the clear liquid 8 within the pipe 26. The valve 20 may be closed when the collector 3 or collector filter is removed. The clear liquid 8 may contact the activated carbon of the collector 3 for concentrating the gold on the activated carbon and amount of the gold concentrated on the activated carbon may be analyzed. After the clear liquid 8 is flown through the collector 3 it may be removed from a sample device outlet 7 back to the process. The housing 22 of the sample device 2 may comprise at least one window 25 on an outer surface of the housing 22 . The at least one window 25 may be located at least one side of the housing 22 . At least one gold sample which may comprise concentrated gold on the activated carbon may be analyzed by an analyzer 4 . The analyzer 4 may be placed opposite the at least one window 25 . This way the analyzer 4 may analyze the gold sample through the window 25 as often as needed . This way the sample or the collector 3 may not have to be moved anywhere . However, the collector 3 may be removed and taken to the measurement site , if needed . The collector 3 may be located close to or in connection with the window 25 .

[0040] According to an example embodiment , the housing 22 comprises a window 25 or the housing 22 does not comprise a window 25 .

[0041] According to an example embodiment , the housing 22 is made of transparent material . The transparent material may allow radiation of the analyzer 4 to go through a housing wall . The transparent material may allow the analyzer 4 to analyze the gold sample through the transparent housing wall . This means that the housing 22 may not comprise a window 25 . The material of the housing 22 and or the rotation circuit 21 may be at least one of the following : silicone , polymer, and / or glass . The polymer is for example at least one of the following : polyethylene , polypropylene , and / or any other suitable plastic . These materials may be transparent . The sample device 2 may further comprise a radiation protector, for example a back plate . The radiation protector may protect from the radiation o f the analyzer 4 . An example of figure 3 show schematically a measuring system 1 . It may be similar to the measuring system 1 of figure 2 but the collector 3 may be replaced with a continuous closed loop flow inside the housing 22 . It may also comprise a rotation circuit 21 . The measuring system 1 of figure 3 may comprise a sample device 2 , which may comprise a housing 22 . The housing 22 may comprise a collector 3 at least partly inside the housing 22 . The collector 3 may comprise activated carbon configured to concentrate dissolved gold from the clear liquid 8 . The collector 3 may comprise activated carbon particles , which may be configured to be in motion . The sampling system 1 may further comprise rotation circuit 21 for rotating the activated carbon particles . The sample device 2 may compri se a collector system, which may comprise the rotation circuit 21 and the col lector 3 . The collector may be located inside the hous ing 22 . The rotation circuit 21 may be located outside the housing 22 or at least partly outside the housing 22 . The activated carbon particles may move inside the collector 3 and inside the rotation circuit 21 . The activated carbon particles may move from the col lector to the rotation circuit 21 and from the rotation circuit 21 into the collector 3 . The rotation circuit 21 may be in fluid contact with the collector 3 . The rotation circuit 21 may add rotation to the activated carbon particles inside the housing 22 . The collector 3 may have the si ze o f the housing 22 . The sampling system 1 may further comprise a pump 19 to rotate the activated carbon particles inside the collector 2 and the rotation circuit 21 . The rotation circuit 21 may comprise the pump 19. Circulation of the particles may improve concentration of the gold on the particles . The sample device 2 may receive the clear liquid 8 from the sample f ilter 6 through the pipe 26 . The clear liquid 8 may enter into the housing from a bottom of the housing 22 and leave the housing 22 from an upper part of the housing . The rotation circuit 21 may receive the clear liquid 8 from the bottom of the housing 22 and rotate the clear liquid 8 back to the housing 22 from the top of the housing 22 . This way the clear liquid 8 inside the housing may have two-way movement from the top to the bottom and from the bottom to the top . This may improve concentration of the gold on the activated carbon particles . The analyzer 4 may measure concentration of the gold through the transparent wal l o f the housing 22 . According to an example embodiment , the housing of figure 3 may also comprise a window 25 .

[0042] According to an example embodiment, the collector 3 comprises activated carbon particles , which are configured to be stationary or in motion .

[0043] According to an example embodiment , the collector device 3 comprises a collector filter or is a collector filter comprising the activated carbon particles .

[0044] According to an example embodiment, the sample device 2 comprises a rotation circuit 21 , inside which the activated carbon particles are configured to be circulated .

[0045] According to an example embodiment , the collector 3 i s configured to scale up gold concentration to 0 , 1- 100 ppm .

[0046] According to an example embodiment , the measuring system further comprises an analyzer 4 configured to measure concentration of the gold from the collector 3 for producing measurement information 9 . According to an example embodiment , the analyzer 4 is configured to continuously or at intervals , measure concentration of the gold from the collector 3 to form measurement information 9 .

[0047] According to an example embodiment, an interval to measure concentration of the gold from the collector is every 1- 60 minutes , every 1-30 minutes , or 1- 10 minutes .

[0048] According to an example embodiment , he analyzer 4 is configured to measure concentration of the gold from the collector 3 after the gold has been configured to be concentrated in the activated carbon for a period of time to form measurement information 9 .

[0049] According to an example embodiment , the period o f time the gold has been conf igured to be concentrated in the activated carbon is 10 seconds to 550 minutes , or 30 seconds to 300 seconds .

[0050] According to an example embodiment , the analyzer 4 is configured to be arranged in connection with the sample device 2 in such manner that at least one side of the collector 3 is configured to be facing the analyzer 4 for measuring concentration of the gold from the collector 3 . The analyzer 4 may measure the concentration of the gold through the window 25 or through a transparent outer surface or a wall of the housing 22 . The window 25 may be a see-through or transparent window . The collector 3 may be located close or in contact with the window 25 . The analyzer 4 may measure concentration of the gold through the window 25 .

[0051] According to an example embodiment , after the gold has been configured to be concentrated in the activated carbon for the period of time , the collector 3 is configured to be removed from the sample device 2 . After that the col lector 3 may be arranged in connection with the analyzer 4 in such manner that at least one side of the collector 4 may be configured to be facing the analyzer 4 for measuring concentration of the gold from the collector 3 .

[0052] According to an example embodiment , the measurement information 9 from the analyzer is configured to form a gold loading curve , wherein an angular coef ficient of the gold loading curve i s configured to be used to determine the amount of the gold in the clean liquid .

[0053] According to an example embodiment , the analyzer 4 is a laser induced breakdown spectroscopy ( LIBS ) or X-ray fluorescence (XRF) spectroscopy .

[0054] According to an example embodiment , measurement accuracy of the analyzer 4 is configured to be adj usted by changing grain si ze o f the activated carbon or by adj usting the measurement time .

[0055] According to an example embodiment , the measuring system 1 further comprises a control unit 5 configured to receive the measurement information 9 from the analyzer 4 and to control the CIL system 10 . The measurement information 9 provided by the analyzer 4 to the control unit 5 may help maintain optimal carbon and cyanide ef ficiency and enabled more ef ficient control of the CIL system 10 . This information may be provided by an onl ine analyzer . Utili zing real time data to continuously optimi ze operations may be an essential step in maximizing the gold recovery .

[0056] From measurement results it may be possible to make a gold loading curve . From a coef ficient of the loading curve , the amount of the gold in the original clear liquid 8 and the sample 12 may be deduced .

[0057] According to an example embodiment , a carbon in leach CIL system 10 comprises at least one measuring system 1 according to any one of the embodiments described above .

[0058] It is specifically to be understood that any method for preparing a gold sample according to this speci fication may be used to operate a measuring system according to this speci fication . Correspondingly, any measuring system according to this speci f ication may be operated in accordance with a method according to this speci fication .

[0059] Fig . 4 illustrates an example of a method for preparing a gold sample for analysis by an analyzer with a measuring system 1 . The measuring system 1 may comprise a sample filter 6 , a sample device 2 comprising a housing 22 , and a collector 3 at least partly inside the housing 22 . The col lector 3 may comprise activated carbon configured to concentrate dissolved gold from clear liquid 8 .

[0060] At operation 400 , the method may comprise receiving sample 12 from a carbon in leach CIL system 10 , by a sample filter 6 , and filtering the sample 12 to form clear liquid 8 .

[0061] At operation 410 , the method may comprise receiving, by the sample device 2 , the clear liquid 8 and flowing the clear liquid 8 at least partly through the collector 2 .

[0062] At operation 420 , the method may comprise contacting the clear liquid 8 with the activated carbon of the collector 3 for concentrating the gold in the activated carbon . At operation 430 , the method may comprise measuring amount of the gold concentrated in the activated carbon .

[0063] It is obvious to a person skilled in the art that with the advancement of technology, the basic idea of the invention may be implemented in various ways . The invention and its embodiments are thus not limited to the examples described above , instead they may vary within the scope of the claims .

[0064] It wil l be understood that any bene fits and advantages described above may relate to one embodiment or may relate to several embodiments . The embodiments are not limited to those that solve any or all of the stated problems or those that have any or all of the stated benefits and advantages .

[0065] The term "comprising" is used in this speci fication to mean including the feature ( s ) or act ( s ) followed thereafter, without excluding the presence of one or more additional features or acts . I t will further be understood that reference to ' an ' item refers to one or more of those items .

Claims

CLAIMS1. A measuring system (1) for preparing at least one gold sample for analysis by an analyzer (4) , wherein the measuring system (1) comprises a sample filter (6) configured to receive sample (12) from a carbon in leach (CIL) system (10) and to filter the sample (12) to form clear liquid (8) ; and a sample device (2) comprising a housing (22) ; and a collector (3) at least partly inside the housing (22) , wherein the collector (3) comprises activated carbon configured to concentrate dissolved gold from the clear liquid ( 8 ) ; wherein the sample device (2) is configured to receive the clear liquid (8) , which is configured to flow at least partly through the collector (3) ; the clear liquid (8) is configured to contact with the activated carbon of the collector (3) for concentrating the gold on the activated carbon; and amount of the gold concentrated on the activated carbon is configured to be analyzed.

2. The measuring system (1) according to claim 1, wherein the collector (3) comprises activated carbon particles, which are configured to be stationary or in motion .

3. The measuring system (1) according to claim 1 or claim 2, wherein the collector device (3) comprises a collector filter comprising the activated carbon particles.

4. The measuring system (1) according to claim 2 or claim 3, wherein the sample device (2) comprises a rotation circuit (21) , inside which the activated carbon particles are configured to be circulated.

5. The measuring system (1) according to any preceding claim, wherein the collector (3) is configured to scale up gold concentration to 0,1-100 ppm.

6. The measuring system (1) according to any preceding claim, wherein the measuring system further comprises an analyzer (4) configured to measure concentration of the gold from the collector (3) for producing measurement information (9) .

7. The measuring system (1) according to claim6, wherein the analyzer (4) is configured to continuously or at intervals, measure concentration of the gold from the collector (3) to form measurement information (9) ; or measure concentration of the gold from the collector (3) after the gold has been configured to be concentrated in the activated carbon for a period of time to form measurement information (9) .

8. The measuring system (1) according to claim7, wherein an interval to measure concentration of the gold from the collector is every 1-60 minutes, preferably 1-30 minutes, more preferably 1-10 minutes; orthe period of time the gold has been configured to be concentrated in the activated carbon is 10 seconds to 550 minutes, preferably 30 seconds to 300 seconds.

9. The measuring system (1) according to claim 7 or claim 8, wherein after the gold has been configured to be concentrated in the activated carbon for the period of time, the collector (3) is configured to be removed from the sample device (2) and to be arranged in connection with the analyzer (4) in such manner that at least one side of the collector (3) is configured to be facing the analyzer (4) for measuring concentration of the gold from the collector (3) .

10. The measuring system (1) according to any one of claims 6 to 8, wherein the analyzer (4) is configured to be arranged in connection with the sample device (2) in such manner that at least one side of the collector (3) is configured to be facing the analyzer (4) for measuring concentration of the gold from the collector ( 3 ) .

11. The measuring system (1) according to any preceding claim, wherein the measurement information (9) from the analyzer (4) is configured to form a gold loading curve, wherein an angular coefficient of the gold loading curve is configured to be used to determine the amount of the gold in the clean liquid (8) .

12. The measuring system (1) according to any preceding claim, wherein measurement accuracy of the analyzer (4) is configured to be adjusted by changinggrain size of the activated carbon or by adjusting the measurement time.

13. The measuring system (1) according to any preceding claims, wherein the measuring system (1) further comprises a control unit (5) configured to receive the measurement information (9) from the analyzer (4) and to control the CIL system (10) .

14. A carbon in leach (CIL) system (10) comprising at least one measuring system (1) according to any one of claims 1 to 13.

15. A method for preparing a gold sample for analysis by an analyzer with a measuring system (1) , wherein the measuring system (1) comprises a sample filter (6) ; and a sample device (2) comprising a housing (22) ; and a collector (3) at least partly inside the housing (22) , wherein the collector (3) comprises activated carbon configured to concentrate dissolved gold from clear liquid (8) , wherein the method comprises receiving sample (12) from a carbon in leach (CIL) system (10) , by a sample filter (6) , and filtering the sample (12) to form clear liquid (8) ; receiving, by the sample device (2) , the clear liquid (8) and flowing the clear liquid (8) at least partly through the collector (2) ; contacting the clear liquid (8) with the activated carbon of the collector (3) for concentrating the gold in the activated carbon; andmeasuring amount of the gold concentrated in the activated carbon .

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