Experimental gamma-ray logging of drill holes in the Calamity area, Mesa County, Colorado
Kenneth Granville Bell, Allen Stuart Rogers · 1950
7* •Barnaby" cannot be calibrated by making use of the record of chemical analyses of core samples.The analyses are extremely erratic and do not appear to be accurate indicators of the grade of ore existing in the ground* It in assumed that the chemists furnished accurate analyses of the samples recovered, but, poor core recovery from the ore zones does not furnish representative samples of the ore existing in the ground* '/