In 2019, geologists at Ascot Resources, a Canadian mining company specializing in silver and gold, began investigating an old mine in the Big Missouri Ridge that had been left inactive since the 1940s. They knew from surface drilling programs that there was still some gold but required further inspection to determine the extent of the resources.
Typically, surveyors would enter with handheld cavity monitoring tools. But, narrower tunnels and more limited vehicle access due to the constraints of 1940s technology presented logistical challenges for human teams that would attempt to survey the mine.
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