Do they make a metal detector that mounts to excavation equipment used to eliminate digging into metal objects?

Similar questions: make metal detector mounts excavation equipment eliminate digging objects.

No. Excavation equipment tends to be made out of metal, and having a metal detector in close vicinity of large chunks of metal pretty much makes it impossible for it to detect other metal objects. If there is a suspiscion that there is something in the ground it has to be surveyed before bringing in the digger.

Probably has been tried, but doesn't work. At best it would detect the big stuff that's nearly impossible to break, like cast-iron sewer pipes. Probably could not detect the more important stuff that has little or no metal in it-- phone lines, fiber optic lines, and gas lines.

I think for some lines they bury a red plastic strip a few feet above the line that has written on it "You dummy, you didn't call for a utility survey".

As has been said, if they tried, it would tell you that there is an excavator bucket where you want to dig.

The problem, of course, is that there is nearly always something where you want to dig - in any situation where you are adding more stuff. Often the electric utility uses a earning tape to let you know you are getting close, but the only real safe way of digging close to buried utilities is to dig by hand - carefully in the case of direct buried TV and telephone lines; and some types of natural gas pipe.

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