Ground Survey technical specifications

Ground Survey technical specifications

​As part of the geochemistry programme, a wide range of elements and compounds are measured in three environmental media: topsoil, stream water and stream sediment. Other samples collected but not routinely analysed include subsoil, vegetation and panned concentrate samples – these are available from the GSI archive on request.

                                                             Shallow Soil

1. Sampling

 

  • Composite sample from points and centre of 20 m x 20 m square
  • Collection by hand auger to 20 cm and 50 cm depths

 

​2. Preparation

 

  • Drying
  • Disaggregation
  • Milling to fine powder pulp

​3. Analysis

 

  • Multi-element ICP-MS
  • Multi-element XRFS
  • pH and Loss-on-ignition (organic carbon)

​4. Data Processing

 

  • Quality control
  • Statistical analysis
  • Mapping
  • Interpretation

                                                                Stream Sediments​ ​

​1. Sampling

 

  • In-situ wet sieving technique from small streams
  • Collection of <150 µm fraction

​2. Preparation

 

  • Drying
  • Disaggregation

​4. Analysis

 

  • Multi-element XRFS
  • Precious group elements fire assay

 

​3. Data Processing

 

  • Quality control
  • Statistical analysis
  • Mapping
  • Interpretation

​Stream Water ​

​1. Sampling

 

  • Collection of filtered water, <0.45µm 

​2. Preparation

 

  • Acidification

​3. Analysis

 

  • Multi-element ICP-MS
  • Major ions IC
  • Organic carbon 

​4. Data Processing

 

  • Quality control
  • Statistical analysis
  • Mapping
  • Interpretation