Selected Applications of Handheld, Near-Surface EM

Systems

SAGE

Vertical Distribution of EM Response

Factors that affect Soil Conductivity

• Water Content• Soil Texture• Soil Organic Matter• Depth to Claypans• Cation Exchange Capacity (CEC)• Salinity• Exchangeable Ca and Mg• Water Holding Capacity of Soil

soil properties include:

Survey Summary

• Data collected with EM31

• 2 m line spacing, 1.5 m station int.

• Total 1500 stations• In-phase & Quad• Survey time 5 hours• Total cost $1,500

Conductivity in mS/m

Conclusion

Ultimately, the overburden and 5 feet of rock was excavated and sent for processing. The revised cleanup cost was over 8 million dollars