From their announcement:"scintillometer does not measure uranium...

From their announcement:

"scintillometer does not measure uranium directly, it measures radiation from the decay of either uranium, thorium or potassium. In this area it is well known that the radiation is likely to almost entirely be from the decay of uranium minerals. This is supported by the observation of secondary uranium minerals. The cps data cannot be converted to uranium grades but good grades are expected based on the high cps data in the trenches."

In my work environment we have to take scintillometer readings from a distance of 1m from the source. It's very easy to max out the detector when holding it against the source as they were doing in a photo in a previous announcement. Taking an accurate reading from a distance of 1m in a trench would be almost impossible however.

In short - dont read too much into the scintillometer. Its a great sign but too inaccurate IMO.