CA2746605A1 - Method and apparatus for gold detection - Google Patents
Method and apparatus for gold detection Download PDFInfo
- Publication number
- CA2746605A1 CA2746605A1 CA2746605A CA2746605A CA2746605A1 CA 2746605 A1 CA2746605 A1 CA 2746605A1 CA 2746605 A CA2746605 A CA 2746605A CA 2746605 A CA2746605 A CA 2746605A CA 2746605 A1 CA2746605 A1 CA 2746605A1
- Authority
- CA
- Canada
- Prior art keywords
- wavelength range
- light
- preselected wavelength
- reflected
- material sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract 8
- 239000010931 gold Substances 0.000 title claims abstract 8
- 229910052737 gold Inorganic materials 0.000 title claims abstract 8
- 238000000034 method Methods 0.000 title claims 14
- 238000001514 detection method Methods 0.000 title abstract 2
- 239000000463 material Substances 0.000 claims 20
- 239000011159 matrix material Substances 0.000 claims 8
- 238000001228 spectrum Methods 0.000 claims 4
- 239000013307 optical fiber Substances 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 2
- 239000011707 mineral Substances 0.000 abstract 2
- 239000002245 particle Substances 0.000 abstract 1
- 239000011435 rock Substances 0.000 abstract 1
- 239000002689 soil Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0218—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using optical fibers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0272—Handheld
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/02—Mechanical
- G01N2201/022—Casings
- G01N2201/0221—Portable; cableless; compact; hand-held
Abstract
A gold detection apparatus capable of detecting gold in field mineral samples such as rock or soil with little or no preparation. Light in red and violet wavelengths is directed at a surface of a mineral sample and the reflected light intensity is measured by an array of sensors or pixels. Based on the characteristic reflectance properties of gold, the reflected light intensity in each wavelength is used to determine the presence of gold particles.
Claims (24)
1. A method for detecting gold in a material sample, the method comprising:
a) illuminating the material sample with light in a first preselected wavelength range and with light in a second preselected wavelength range;
b) detecting the light in the first preselected wavelength range reflected by the material sample and the light in the second preselected wavelength range reflected by the material sample; and c) comparing, using a processor, a relative intensity of the reflected light in the first preselected wavelength range to the reflected light in the second preselected wavelength range.
a) illuminating the material sample with light in a first preselected wavelength range and with light in a second preselected wavelength range;
b) detecting the light in the first preselected wavelength range reflected by the material sample and the light in the second preselected wavelength range reflected by the material sample; and c) comparing, using a processor, a relative intensity of the reflected light in the first preselected wavelength range to the reflected light in the second preselected wavelength range.
2. The method of claim 1, wherein the material sample is substantially simultaneously illuminated in the first preselected wavelength range and in the second preselected wavelength range.
3. The method of claim 1, wherein the material sample is sequentially illuminated in the first preselected wavelength range and in the second preselected wavelength range.
4. The method of claim 1, wherein b) is carried out by an image sensor comprising a two-dimensional matrix of sensor elements, and wherein c) comprises comparing the relative intensity for each sensor element in the two-dimensional matrix of sensor elements to compute a weighted intensity value for each sensor element.
5. The method of claim 4, further comprising comparing the relative intensity of the reflected light in the first preselected wavelength range detected at each sensor element in the two-dimensional matrix of sensor elements to an average relative intensity of the reflected light in the first preselected wavelength range detected by the two-dimensional matrix of sensor elements.
6. The method of claim 1, wherein the first preselected wavelength range is in the BV
spectrum, and wherein the second preselected wavelength range is in the ROY
spectrum.
spectrum, and wherein the second preselected wavelength range is in the ROY
spectrum.
7. The method of claim 6, wherein the reflected light in the first preselected wavelength range comprises substantially monochromatic light with a wavelength less than 500 nm, and wherein the reflected light in the second preselected wavelength range comprises substantially monochromatic light with a wavelength greater than 500 nm.
8. The method of claim 1, wherein the reflected light is filtered to isolate the first preselected wavelength range, and wherein the reflected light is separately filtered to isolate the second preselected wavelength range.
9. The method of claim 1, further comprising detecting ambient light reflected by the material sample, wherein the detected ambient light reflected by the material sample is used to reduce noise when computing the relative intensity in c).
10.An apparatus for detecting gold in a material sample, the apparatus comprising:
a) at least one light source for illuminating the material sample with light in a first preselected wavelength range and with light in a second preselected wavelength range;
b) an image sensor for detecting the light in the first preselected wavelength range reflected by the material sample and the light in the second preselected wavelength range reflected by the material sample; and c) a processor, for comparing a relative intensity of the reflected light in the first preselected wavelength range to the reflected light in the second preselected wavelength range.
a) at least one light source for illuminating the material sample with light in a first preselected wavelength range and with light in a second preselected wavelength range;
b) an image sensor for detecting the light in the first preselected wavelength range reflected by the material sample and the light in the second preselected wavelength range reflected by the material sample; and c) a processor, for comparing a relative intensity of the reflected light in the first preselected wavelength range to the reflected light in the second preselected wavelength range.
11. The apparatus of claim 10, wherein the image sensor comprises a two-dimensional matrix of sensor elements, and wherein the processor compares the relative intensity for each sensor element in the two-dimensional matrix of sensor elements to compute a weighted intensity value for each sensor element.
12.The method of claim 11, wherein the processor is also configured to compare the relative intensity of the reflected light in the first preselected wavelength range detected at each sensor element in the two-dimensional matrix of sensor elements to an average relative intensity of the reflected light in the first preselected wavelength range detected by the two-dimensional matrix of sensor elements.
13. The apparatus of claim 11, wherein each sensor element comprises a first sub-element sensitive to the first preselected wavelength range and a second sub-element sensitive to the second preselected wavelength range.
14. The apparatus of claim 10, wherein the first preselected wavelength range is in the BV
spectrum, and wherein the second preselected wavelength range is in the ROY
spectrum.
spectrum, and wherein the second preselected wavelength range is in the ROY
spectrum.
15. The apparatus of claim 13, wherein the reflected light in the first preselected wavelength range comprises substantially monochromatic light with a wavelength less than 500 nm, and wherein the reflected light in the second preselected wavelength range comprises substantially monochromatic light with a wavelength greater than 500 nm.
16. The apparatus of claim 10, wherein the image sensor is configured to detect ambient light reflected by the material sample, and wherein the processor is configured to use the detected ambient light reflected by the material sample to reduce noise when computing the relative intensity.
17. The apparatus of claim 10, further comprising a first lens element, the first lens element for focusing light reflected by the material sample onto the image sensor.
18. The apparatus of claim 17, further comprising a second lens element, the second lens element for diffusing light from the at least one light source onto the material sample.
19. The apparatus of claim 18, wherein the second lens element is an end of an optical fiber.
20. The apparatus of claim 10, wherein the at least one light source comprises a first laser source for transmitting light in the first preselected wavelength range and a second laser source for transmitting light in the second preselected wavelength range.
21. The apparatus of claim 10, wherein the at least one light source is a broad spectrum light source, the apparatus further comprising a first filter element to filter the reflected light to isolate the first preselected wavelength range, and a second filter element to filter the reflected light to isolate the second preselected wavelength range.
22. The apparatus of claim 10, wherein the image sensor is selected from the group consisting of a CCD image sensor and a CMOS image sensor.
23. The apparatus of claim 10, further comprising a portable enclosure, the portable enclosure housing the at least one light source, the image sensor and the processor.
24.A non-transitory computer-readable storage medium with an executable program stored thereon, the executable program configured to instruct a processor to perform a method for detecting gold in a material sample, the method comprising:
a) illuminating the material sample with light in a first preselected wavelength range and with light in a second preselected wavelength range;
b) detecting the light in the first preselected wavelength range reflected by the material sample and the light in the second preselected wavelength range reflected by the material sample; and c) comparing a relative intensity of the reflected light in the first preselected wavelength range to the reflected light in the second preselected wavelength range.
a) illuminating the material sample with light in a first preselected wavelength range and with light in a second preselected wavelength range;
b) detecting the light in the first preselected wavelength range reflected by the material sample and the light in the second preselected wavelength range reflected by the material sample; and c) comparing a relative intensity of the reflected light in the first preselected wavelength range to the reflected light in the second preselected wavelength range.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/182871 | 2011-07-14 | ||
| US13/182,871 US8416418B2 (en) | 2011-07-14 | 2011-07-14 | Method and apparatus for gold detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2746605A1 true CA2746605A1 (en) | 2012-01-26 |
| CA2746605C CA2746605C (en) | 2012-10-09 |
Family
ID=45525126
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2746605A Expired - Fee Related CA2746605C (en) | 2011-07-14 | 2011-07-15 | Method and apparatus for gold detection |
| CA2841858A Abandoned CA2841858A1 (en) | 2011-07-14 | 2012-07-11 | Method and apparatus for gold detection |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2841858A Abandoned CA2841858A1 (en) | 2011-07-14 | 2012-07-11 | Method and apparatus for gold detection |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US8416418B2 (en) |
| EP (1) | EP2732264A4 (en) |
| AU (1) | AU2012283710B2 (en) |
| CA (2) | CA2746605C (en) |
| WO (1) | WO2013006955A1 (en) |
| ZA (1) | ZA201400393B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9188531B2 (en) | 2011-07-14 | 2015-11-17 | Kendall Technology Inc. | Method and apparatus for gold detection |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472007A (en) * | 2013-09-05 | 2013-12-25 | 贵州安吉航空精密铸造有限责任公司 | Method for detecting elements in alloy |
| CN109844498B (en) * | 2016-11-30 | 2022-10-18 | 杰富意钢铁株式会社 | Powder ratio measuring device and powder ratio measuring system |
| GB2563581A (en) * | 2017-06-16 | 2018-12-26 | Sumitomo Chemical Co | Device |
| US10072919B1 (en) | 2017-08-10 | 2018-09-11 | Datacloud International, Inc. | Efficient blast design facilitation systems and methods |
| US10101486B1 (en) | 2017-08-10 | 2018-10-16 | Datacloud International, Inc. | Seismic-while-drilling survey systems and methods |
| US10989828B2 (en) | 2018-02-17 | 2021-04-27 | Datacloud International, Inc. | Vibration while drilling acquisition and processing system |
| US10697294B2 (en) | 2018-02-17 | 2020-06-30 | Datacloud International, Inc | Vibration while drilling data processing methods |
| JP6879276B2 (en) * | 2018-08-21 | 2021-06-02 | Ｊｆｅスチール株式会社 | Method and device for determining the generation of air-dispersed fine particles and method and device for measuring the properties of agglomerates |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3316545A (en) | 1964-07-27 | 1967-04-25 | Jess M Reed | Detector for native particles of gold and platinum |
| US3395987A (en) | 1966-02-17 | 1968-08-06 | Interior Usa | Field method for the determination of silver in soils and rocks |
| US3397040A (en) | 1966-02-28 | 1968-08-13 | Interior Usa | Spectrophotometric method for the determination of gold |
| US3702735A (en) | 1971-05-12 | 1972-11-14 | Nasa | Multispectral imaging system |
| US3910701A (en) | 1973-07-30 | 1975-10-07 | George R Henderson | Method and apparatus for measuring light reflectance absorption and or transmission |
| US4345840A (en) | 1980-04-08 | 1982-08-24 | California Institute Of Technology | Method and apparatus for instantaneous band ratioing in a reflectance radiometer |
| US4324555A (en) | 1980-06-27 | 1982-04-13 | Phillips Petroleum Company | Uranium exploration |
| US5946102A (en) | 1997-07-28 | 1999-08-31 | Mmr Technologies, Inc. | Method and apparatus for parameter difference imaging of a sample surface |
| US6624888B2 (en) | 2000-01-12 | 2003-09-23 | North Dakota State University | On-the-go sugar sensor for determining sugar content during harvesting |
| US6512577B1 (en) | 2000-03-13 | 2003-01-28 | Richard M. Ozanich | Apparatus and method for measuring and correlating characteristics of fruit with visible/near infra-red spectrum |
| DE10042003B4 (en) * | 2000-08-26 | 2005-08-11 | Robert Bosch Gmbh | Material testing device and its use |
| US6587575B1 (en) * | 2001-02-09 | 2003-07-01 | The United States Of America As Represented By The Secretary Of Agriculture | Method and system for contaminant detection during food processing |
| US6686202B2 (en) | 2001-08-08 | 2004-02-03 | Placer Dome, Inc. | Methods for detecting and extracting gold |
| US7236243B2 (en) | 2004-04-12 | 2007-06-26 | Michael Thomas Beecroft | Hand-held spectrometer |
| US7368292B2 (en) | 2006-03-10 | 2008-05-06 | University Of Florida Research Foundation, Inc. | Differential reflection spectroscopy system and method for detecting explosives and other target materials |
| US7924414B2 (en) | 2006-05-10 | 2011-04-12 | Abb Schweiz Ag | Non-hazardous bulk material analyzer system |
| PT103561A (en) | 2006-09-08 | 2008-03-31 | Univ Nova De Lisboa | SYSTEM OF DETECTION AND QUANTIFICATION OF BIOLOGICAL MATTER CONSTITUTED BY ONE OR MORE OPTICAL SENSORS AND ONE OR MORE LIGHT SOURCES, ASSOCIATED PROCEDURE AND THEIR RESPECTIVE USES |
| GB2464747B (en) * | 2008-10-10 | 2013-05-15 | Hai Kang Life Corp Ltd | Method for detection of analyte in microarray of samples and apparatus for performing such method |
| CN102439422B (en) | 2009-03-30 | 2016-05-18 | 3M创新有限公司 | For detection of photoelectric method and the device of analyte |
| US9304202B2 (en) * | 2009-05-27 | 2016-04-05 | Analog Devices, Inc. | Multiuse optical sensor |
-
2011
- 2011-07-14 US US13/182,871 patent/US8416418B2/en not_active Expired - Fee Related
- 2011-07-15 CA CA2746605A patent/CA2746605C/en not_active Expired - Fee Related
-
2012
- 2012-07-11 CA CA2841858A patent/CA2841858A1/en not_active Abandoned
- 2012-07-11 EP EP20120812071 patent/EP2732264A4/en not_active Withdrawn
- 2012-07-11 AU AU2012283710A patent/AU2012283710B2/en not_active Ceased
- 2012-07-11 WO PCT/CA2012/000660 patent/WO2013006955A1/en active Application Filing
-
2014
- 2014-01-17 ZA ZA2014/00393A patent/ZA201400393B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9188531B2 (en) | 2011-07-14 | 2015-11-17 | Kendall Technology Inc. | Method and apparatus for gold detection |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2012283710B2 (en) | 2015-08-13 |
| AU2012283710A1 (en) | 2014-02-06 |
| ZA201400393B (en) | 2015-05-27 |
| WO2013006955A1 (en) | 2013-01-17 |
| EP2732264A1 (en) | 2014-05-21 |
| US8416418B2 (en) | 2013-04-09 |
| US20130016356A1 (en) | 2013-01-17 |
| CA2746605C (en) | 2012-10-09 |
| EP2732264A4 (en) | 2015-03-11 |
| CA2841858A1 (en) | 2013-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20200831 |