He blamed the Taliban, which controls the district where the incident occurred but the insurgent movement denied any involvement.
"The people working in this mine had our permission and we had good relations," Taliban spokesman Zabihullah Mujahid said. "They hadn`t created any problems."
He blamed "arbakis" or members of informal local militias, in the area for the killings.
Hazaras are a Persian-speaking, largely Shia minority, who have faced a long history of discrimination and violence in mainly Sunni Afghanistan.
Last year, scores of Hazara were killed in a series of attacks in Kabul, some claimed by Islamic State in an apparent attempt to stir sectarian tensions.
The incident underlines the dire security situation in the country, where government forces now control only two-thirds of national territory and violence is a daily occurrence.
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