I have been to Peru and chewed coca leaves while hiking the Andes and it is something that has been a part of the culture for thousands of years. It is a tradition that if marketed correctly can take the Bolivian Indigenous people out of poverty. Why should children, who if educated could create a new middle class for the indigenous, be working in the metal {copper&gold??} mines to supply a wealthy elite with even more wealth. It is their country, the Euro descended came thousands and thousands of years later and brutally enslaved the indigenous to their system of capital{ism}. It is the same fascists with zero ethics save for greed and power-over as their guiding principles who continue the enslavement of the people of the world. They are unrelenting in their onslaught against the indigenous world.
Even in the US after nearly all has been privatized out from under the ignorant mass of the people, the oil companies want the ANWR to drill in so they can become wealthier and destroy the earth while the earth's carbon sinks are full. Means We as a species cannot burn anymore of these fossil fuels into our atmosphere. Once the methane is released from the Arctic Tundra we will be breathing CH4 instead of O2. We have the fascist capitalists to thank for maintaining the path to the destruction of our planet. Viva Evo Morales and the indigenous people of the Andes, may you stand against the capitalists and take back your country.
We don't need anymore metals, we need the coca cultivation. The world will need it to numb the pain of what appears to be coming. The Kogi of Columbia are right. 'Little Brother' will not stop digging in the earth and he will kill us all. Check out the Kogi of Columbia, one of the last tribes recently found in the Andes.

Why do miners engage in clashes? Do they take place in the mines?