The linked article has a video of the actual shooting from someone standing just behind the police, it certainly shows some of the strikers charging at them before they open fire but contains no confirmation that they were armed.
The above is from your own link but of course you just chose to ignore the petrol bombs/grenades and the bit about refusing to drop the machetes. I am sure of course that in the eyes of the left coming armed to a "peaceful" strike is perfectly acceptable.
Here are some pics of these peaceful striking miners.
At least two have machetes, and the rest have clubs and spears.
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