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Oakmount and Partners Ltd. Everything You Need to Know About In-Situ Mining.

How do you mine without moving a rock?


When most people think of mining they think of massive open pits or deep and winding underground tunnels. But there is one mining method that does not move a rock and leaves the landscape as is.


Today’s infographic from Excelsior Mining Corp. outlines a unique mining method, In-Situ Recovery “ISR”, also known as In-Situ Mining.

An Intro to In-Situ Mining

ISR is not a recent innovation in the mining sector. In fact, ISR has been used for the past 50 years in uranium mining, and 48% of the world’s uranium gets mined this way. Uranium is not the only mineral it can extract; there is also silver, copper, and sometimes gold.


ISR involves dissolving a mineral deposit in the ground and then processing it at surface, all without moving any rock. It is cost effective and environmentally friendly.


But if this method is so great, how come more companies do not mine this way?


The Right Geology

ISR is not widely used because the geological conditions have to be just right. There are few locations around the world that meet the following criteria:


Highly permeable ore body. In the case of copper, the ore body must be naturally broken, fractured and permeable.Mineable. The target mineral must be soluble with the right fluid, typically a weak acid.Under the water table. The mineral deposit must be below the water table to allow for the movement of fluids throughout the ore body.


If geologists can find these conditions and it is a large enough mineral deposit, it is time to mine.


The ISR Process

Once the right conditions are met and drill holes are sunk into the ore body, mining can begin.


Leaching solution is pumped through injection wellsThe solution moves through the naturally fractured rock and leaches the copperRecovery wells extract the copper-rich solutionSolution is pumped to the surface to the plant for processingCopper is extracted from the solution to create pure copper sheetsMining solution is recycled back to the well field.


Once an area is mined, the wells are flushed with water to clean out any remaining leaching solution. Meanwhile, the surface is returned back to pre-mining conditions, allowing it to be used for any purpose in the future.


Advantages of In-Situ Mining

The environmental advantages are clear, including: minimal noise, dust, or greenhouse gas emissions, along with minimal visual disturbance. In addition, it also lowers capital and operating costs while creating a safer environment for mine workers.


Too bad not all mines can operate without moving a rock. Source: Visual Cap.


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