Radium Geochemistry in Sediments Responds to Uranium Mineralization at Bancroft

radium in sediments finds Bancroft uranium deposits Geochemical contour map from 1968 samples
  • 95 sediment samples from streams and lakes.
  • Clastic and organic sediment. 38 locations have both types, clearly separate and distinct.
  • When both types present radium is higher in organic type.
  • Radium values in the two types rationalized on a curve and plotted and contoured on the same map (shown).
  • Uranium mineralization is concentrated along the belt of syenitic rocks and nepheline gneiss which occupies the contact between plutonic rocks to the northwest and metasedimentary to the southeast.
  • Note the high values associated with the mineralization and contact
  • Samples downstream from Faraday Mine also high but left off the map because possibly contaminated.
  • Published in Canadian Mining Journal, May 1969, p. 75-76
Drainage point map from 1968 and 1969 samples
  • 258 sediment samples.
  • See notes above.
  • From Ph.D. thesis, Queen's University, 1970
radium and radon in exploration for Bancroft uranium deposits



Click here for technical details and other applications of our radon instruments.
Analytical Technique for Radium in Sediment
  • Ideally use 20 grams of sample but we have worked with less than a gram of fines.
  • Cover the sample with water, let the radon grow it to equilibrium, and measure radon in the water in the normal way.
  • Half-life to reach equilibrium is 3.8 days.
  • Fine sediments collected wet and kept under water remain pretty well in equilibrium.
  • In the same way you can also measure radium in plant parts, soil, crushed rock etc.
  • No need for crushing or chemical attack.
INSTRUMENTS
  • We measure: radon - radium - thoron - radon daughters - alpha radiation.
  • The Lucas cell is recognized as the most sensitive and reliable method for these elements.
  • Intrinsically safe functions.
  • Sensitive to geochemical trace levels necessary for radon in lake water and for radon-thoron isotope ratios.
  • immune to beta and gamma radiation.
  • one monitor works with a number of (less expensive) detectors.
  • Our instruments are used around the world in exploration for uranium, oil & gas, groundwater and hydrothermal, and in environmental protection, health physics, earthquake prediction, and evaluation of hydrocarbon and NAPL contamination etc.
  • Same instruments used for radon and radium in soil, sediment, plant parts, rocks, water, soil gas, air, snow, food, and for radon and thoron daughters in air.
  • Winter and summer, from the Sahara Desert to the Canadian Shield, our instruments have faced up to severe field conditions.
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  • User programmable measurement intervals, sample and count periods and alarm level settings.
  • Can work in a tent without electricity or be carried from point to point in the field.
  • 50 readings per day. Results available immediately.
  • Portable. Rechargeable battery pack good for a long day in the field and recharges in a few hours.
  • Can be operated by junior personnel if carefully supervised.
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Robert H. Morse, Ph.D., P.Eng. June 29, 2007

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