confidential report mineral identification by xrd … · confidential report mineral identification...

CONFIDENTIAL REPORT

Mineral Identification by XRD and EDS Spectrometry

Prepared for Laramide Petrological Services

By Dr. Lucy Hunt and Jennifer Doxey Saskatchewan Research Council

Mining and Minerals Division

SRC Publication No. 13643-2C13

December 2013

CONFIDENTIAL REPORT

Mineral Identification by XRD and EDS Spectrometry

Prepared for Laramide Petrological Services

By Dr. Lucy Hunt and Jennifer Doxey Saskatchewan Research Council

Mining and Minerals Division

SRC Publication No. 13643-2C13

December 2013

Saskatchewan Research Council 125 – 15 Innovation Boulevard

Saskatoon, SK S7N 2X8 Tel: 306-933-6925 Fax: 306-933-7446

December 2013 Mineral Identification by XRD and EDS Spectrometry

SRC Publication No. 13643-2C13 i

List of Figures Figure 1. XRD Spectrum of Sample Green ................................................................................................. 2

Figure 2. XRD Spectrum of Sample Black ................................................................................................... 3

Figure 3. Spectrum of Covellite CuS ........................................................................................................... 4

Figure 4. Spectrum of Chalcocite Cu2S ....................................................................................................... 4

Figure 5. Spectrum of Bornite Cu5FeS4 ...................................................................................................... 5

Figure 6. Spectrum of Epidote ................................................................................................................... 5

Figure 7. Spectrum of Quartz ..................................................................................................................... 5

Figure 8. Unlabelled and labelled BSE image showing a typical area of mineralisation dominated by cv, with a “stringer” of mineralisation appearing to evolve from cv to bn ............................ 6

Figure 9. Unlabelled and labelled BSE image showing a typical area of mineralisation dominated by cv, with minor cc and trace bn ............................................................................................... 7


SRC Publication No. 13643-2C13 1

XRD Analysis

Sample name: Green A representative sample of material was removed from the green specimen using a diamond blade rock saw. The representative sample was finely crushed and submitted for qualitative x-ray diffraction (XRD) analysis. Results of this analysis indicate that the sample is primarily composed of quartz, epidote and clinozoisite in undetermined quantities. The XRD spectrum can be seen in Figure 1.

Sample name: Black A diamond blade rock saw was used to remove a representative sample of material from the specimen containing the black mineral. This material was finely crushed and submitted for qualitative XRD analysis. Due to the closely knit geometry of the minerals in the sample, the surrounding green rock material was also included in the analysis. The results indicate that the sample is primarily composed of bornite, clinochlore, epidote, quartz and dravite in undetermined quantities. The XRD spectrum can be seen in Figure 2.



Figure 1. XRD Spectrum of Sample Green



Figure 2. XRD Spectrum of Sample Black



SEM Analysis

Sample name: Black Based on a qualitative analysis by EDS the majority of ore in the sample provided is comprised of covellite (cv) with minor chalcocite (cc) and trace bornite (bn), although areas of higher concentrations of cc were observed. The gangue minerals present are epidote and quartz. It is recommended that, for a more quantitative evaluation, a sample is prepared for electron microprobe analysis.

Examples of EDS spectrum observed Ore Minerals

Figure 3. Spectrum of Covellite CuS

Figure 4. Spectrum of Chalcocite Cu2S



Figure 5. Spectrum of Bornite Cu5FeS4

Gangue Minerals

Figure 6. Spectrum of Epidote

Figure 7. Spectrum of Quartz



Images of mineralisation observed

Figure 8. Unlabelled and labelled BSE image showing a typical area of mineralisation dominated by cv, with a “stringer” of mineralisation appearing to evolve from cv to bn

C

v

B

n

Quartz (darker BSE) Epidote

(lighter BSE)

“Stringer” goes from

covellite to bornite at tip

(increases in Fe content)



Figure 9. Unlabelled and labelled BSE image showing a typical area of mineralisation dominated by cv, with minor cc and trace bn

bn

cc

cc

cc

cc

Every other ore mineral visible is cv

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