Drill follow up of anomalous radon at the bottom of the snow led to the McClean Lake North Uranium Discovery.

• The Radon survey was carried out with alphameters placed under the snow.
• Although the ore-grade mineralization was at 500 feet, anomalous uranium was observed at much shallower depths. This near surface mineralization may have given rise to the radon anomaly observed at surface.
• This information and the attached figure were taken from Saracoglu,N; Wallis,R.H.; Brummer,J.J.; and Golightly,J.P. 1983: Canadian Mining and Metallurgical Bulletin, vol. 76, No. 852.
• Alphameters have the advantage that they remain at the sample site and collect data over a period of days, averaging out any temporal variations.
• Our instruments have the advantage of instant results at the sample site, with the possibility of immediate follow-up and checking.
• Our instruments also determine thoron, and the Rn/Tn ratio is important in recognising false anomalies due to soil permeability. link.