had been mining
Past perfect progressiveconjugation ofmine.There are other translations for this conjugation.

mine

Since 1885, the principal activity of the canton had been mining and with it, harsh working conditions and a high mortality rate due to inadequate safety. These conditions led to the first strike in the history of the country in 1912.
Las condiciones de trabajo impuestas en la explotación minera fueron muy duras, originando una alta mortalidad, por enfermedades y situaciones de seguridad inadecuada, que en 1912 provocaron la primera huelga obrera en el país.
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