11. In the first extraction of radium Curie used the residues after extraction of uranium from pitchblende . 12. The product that eventually results from weathering of uranium is U 3 O 8, pitchblende . 13. ;1898 : Maria Sklodowska-Curie and Pierre Curie isolate radium and polonium from pitchblende . 14. Pitchblende was discovered in 1948 in the Caribou silver mine at the town of Boulder County.15. In the classical procedure for extracting uranium, pitchblende is broken up and mixed with volatility methods. 16. He helped unearth the vast and profitable pitchblende deposits in the far north region of the province. 17. Pitchblende orebodies were also discovered in the Calhoun mine, the Kirk mine, and some others.18. The oldest type of mineralisation consists of quartz, calcite, fluorite, pitchblende and minor hematite. 19. It shows how uranium, originally sourced from pitchblende , became the subject of intense scientific study. 20. On December 21, 1898, the Curies detected the presence of another radioactive material in the pitchblende .
