Trenching

• (p. pr. & vb. n.) of Trench
Found on http://thinkexist.com/dictionary/meaning/trenching/

Trenching

A trench is invaluable in confirmining the bedrock source of an anomaly, be it geological, geochemical, or geophysical. Trenches and pits also provide large samples for more accurate grade estimates as well as for undertaking pilot processing plant test work to determine likely recoveries.
Found on http://www.britanniamining.com/learning-centre/mining-glossary/
No exact match found