ECONOMIC GEOLOGY MASTERS WS 2013/2014

Modul economic geology of elemental raw material

(Lecture room K1)

 

Ore deposits practical

 

You are an exploration geologist who has brought back from the field (the outback of Australia) an ore deposit sample that you took from a hydrothermal deposit exposed in an outcrop. Your Boss wants to know whether the ore deposit is worth exploiting or not, and if so, for which metals.
To do this you need to first determine its mineralogy based on the elemental maps provided, assess the quantitative analyses of the individual minerals phases and try quantifying the abundance of the different phases on the backscattered electron diffraction image using ImageJ http://rsbweb.nih.gov/ij/. Using this data, try and make a first assessment of the grade (% abundance) of the metals present. Which metals do you think are present at higher enough concentrations to be economically of interest?

Are there any potential health issues that may arise during mining of the deposit?

In addition, you are given a budget of max. 500 Euros to spend on obtaining important analyses of the sample at http://www.actlabs.com/files/Euro_2013_Reduced.pdf. Make a list of which analyses that are most useful by filling out the form at the end of the price list, and state precisely how much the analyses will cost. Justify to your boss why these analyses are really necessary.

Analytical result for the scanning electron microscope study of the sample

 

 

Backscattered electron diffraction image

 

Bi As Ca

 

Co Cr Al

F N i O

S Si

 

 

 

 

Quantification of elemental % (without O)

Spektrum
F
Si
S
Ca
Cr
Fe
Co
Ni
As
Bi
Summe
analysis of complete area
24,34
7,83
2,19
24,62
1,84
8,42
1,13
1,95
17,26
10,44
100
Spektrum 2
49,2
0,53
0,8
47,89
1,57
100
Spektrum 3
100
100
Spektrum 4
14,25
69,38
16,37
100
Spektrum 5
8,42
91,58
100

 

 

Spectrum for complete area

 

 

Spectrum 2

 

 

Spectrum 3

 

 

Spectrum 4

 

 

Spectrum 5