**3. Results**

#### *3.1. Results Prior to Optimisation*

Results from both QEMSCAN® analyses, at CSM and Boliden AB, respectively, showed, overall, a good agreemen<sup>t</sup> with earlier detailed petrographic and SEM studies; however, there were some key differences between the data sets.

## 3.1.1. Measured Area

The areas scanned by QEMSCAN® differed in size between CSM and Boliden AB and did not cover the entire sample (Figure 4). Limitations were set by the design of the sample holders. Furthermore, it was not possible to match the produced BSE and mineral maps of Boliden AB and CSM through image manipulation such as cutting, rotating, and stretching. The reason for this is not certain, but could be an issue with magnification calibration during stitching of the individual fields to a unified image for either operator. These issues prevented full quantitative comparison of the modal mineralogy and mineral association between the two datasets.
