Niocorp Developments Ltd (NB)

[Middleborder]

Smoking Joe

Sure, its a problem if you are digging through gravel on the Laurentian Shield at -20 f.(Under powered backhoe scraping on frozen gravel.)

However..

https://www.nrcs.usda.gov/Internet/FSE_MANUSCRIPTS/nebraska/NE097/0/johnson.pdf

"The major soils on uplands are Loess and glacial material..."
"The soils in Johnson County are maily loamy and clayey and the consist mostly of siltsized and clay material.

And this year they are probably not frozen more than 6 to 9 inches down.

It would be more like this:

"Danish Construction Channel"
Digging A 2 String Sewer Trench In The Frozen Ground: Cab View

same idea, earth frozen to at least 24".