Aluvium deposit environments have not disadvantage for mining.Unfortunately,native peoples have to such a sensing for this type regions!!!Firstly,I clearly express that this condition is a sensing extreme wrong developed due to lack of information;

 Strata of Placer Type Bedding&GPR:

Extracting detailed strata on placer type bedding shortly summaries requirement important capabilities based on software with system handled for detection of target structure/structure locations.As evaluated,focusing to placer type structures of mining researches of today is expressing a dimension related to levels reached of GPR technologies&softwares considered.You are right!!!Subject advantages considering some chapters as practicality,operational times and cost.Also,emphasizing to big advantages about environmental impact matters expressed as traditional of mining.With this results,I share a presentation summaried capabilities of Krot Software for target visualisation of Placer type deposits as complementary;

https://www.youtube.com/watch?v=0TSEUEElUc4&list=LL&index=2

As evaluated as a whole,you have to bigger advantages on mining chapters👍