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Mapping Artisanal and Small-Scale Gold Mining in Senegal Using Sentinel 2 Data.

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  • 1Département de Géologie Université Cheikh Anta Diop de Dakar Dakar Senegal.

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Artisanal and small-scale gold mining (ASGM) in Senegal can now be mapped using Sentinel 2 data. This method helps monitor this vital economic activity and its impacts.

Keywords:
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Area of Science:

  • Earth Observation
  • Remote Sensing
  • Environmental Monitoring

Background:

  • Artisanal and small-scale gold mining (ASGM) is a major income source in Senegal.
  • ASGM growth presents environmental, social, and health challenges.
  • Government monitoring of ASGM is difficult.

Purpose of the Study:

  • To develop a method for detecting and mapping ASGM sites in Senegal.
  • To utilize Sentinel 2 satellite data and Google Earth Engine for this purpose.
  • To provide a tool for monitoring ASGM evolution.

Main Methods:

  • Utilized Sentinel 2 data and Google Earth Engine.
  • Applied Principal Component Analysis (PCA) for optimal mapping periods.
  • Employed Separability and Threshold (SEaTH) for band/index selection.
  • Used Support Vector Machine (SVM) for classification.
  • Validated results with field observations.

Main Results:

  • The end of the dry season is optimal for mapping ASGM due to minimal vegetation.
  • The developed method successfully detected and mapped ASGM sites.
  • Classification maps distinguished ASGM from other land uses.

Conclusions:

  • The proposed method effectively maps ASGM sites in Senegal.
  • This approach can be used for ongoing monitoring of mining activities.
  • The methodology is potentially applicable to other regions in the Sahel.