Police arrested 57 striking workers after a three-week longprotest by 160 members of Association of Mine Workers and Construction Union,or AMCU at GlencorePlc's Wonderfonteincoal mine in South Africa turned violent, Reuters reported April 5, citingpolice spokesperson Kwapa Macdonald and a company statement.

Striking union members threatened other workers and also damagedfarms in the area. The arrested workers have been released on bail, thespokesperson added.

Meanwhile, Glencore said the strike was fairly peaceful inthe first week but turned increasingly violent in the past two weeks, whichpushed the company to obtain a court order against AMCU and its members todesist from acts of violence at the mine.

The Wonderfontein coal project is owned 43.66% by Glencorewhile Shanduka Group owns the remaining stake.