Compagnie des mines de Béthune
Mazingarbe
### Mazingarbe

Excavation of Mine 6 at Mazingarbe began in October 1874 and reached an irregular bed of coal at .
Extraction began in 1876 using a  extraction machine.
Mine 6 was connected to Mine 1 in 1877\.
Shaft 6bis was opened in August 1885\.
Mine 7 was started in April 1875 at Mazingarbe, and reached coal at .
Extraction started in May 1877 using the old extraction machine from Mine 1\.
Shaft 7bis was added in 1905\.


How has coal extraction changed over time in terms of machinery and technology?