vent

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vent - b & w

lightning ridge - outback australia

Close up of the vent of an Opal Agitator ('Agi'). Part of the process of Opal mining is to rinse the dirt from the raw opal and that is done with the use of old cement mixers known as agitators. The water flows from the ‘Agi’ and forms silty mud flows. Here, the silty clay can dry and crack. Coocoran Opal Field. Lightning Ridge, Outback Australia