Show pitchblende IN COLORADO the interest that has recently been manifested in radium has created a public demand for information both practical and theoretical in regard to the mineral deposits from which it is derived A short report by edson is bastin on the geology of the pitchblende ores of colorado recently issued by the united states geological sur vey deals mainly with the geology mineral i ogy agy and origin of these deposits their practical utilization having been treated 8 somewhat e fully in other publications the quantity of uranium ores mined in the united states is exceedingly small and the great bulk of it from utah and southwestern colorado does not carry pitchblende but contains the brilliant yellow uranium mineral the small pitchblende production of this country Is 15 all from the one locality described in this report in the heart of gilpin county famous as the birth place of the gold mining milling industry of colorado there pitchblende occurs as a constituent of mineral veins which were first worked for their gold and silver content and which still yield imbor tant amounts of these precious metals it s is notable that the only other localities to in the world where pitchblende has been found in important quantities in mineral veins veils are the in bohemia and saxony and the cornwall district in eng DIP land its mode of occurrence in these countries is also described by mr bastin |