Tuesday 22nd September 2020

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An infographic intro into in-situ mining

by Nicholas LePan | posted with permission of Visual Capitalist | June 25, 2019


An intro to 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 underground tunnels. But there is one mining method that does not move a rock and leaves the landscape as is.

This infographic from Excelsior Mining TSX:MIN outlines a unique mining method, in-situ recovery or ISR, also known as 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 ISR 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, why don’t more companies 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 for copper

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

  • Leaching solution is pumped through injection wells

  • The solution moves through the naturally fractured rock and leaches the copper

  • Recovery wells extract the copper-rich solution

  • Solution is pumped to the surface to the plant for processing

  • Copper is extracted from the solution to create pure copper sheets

  • Mining solution is recycled back to the wellfield

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 include minimal noise, dust or greenhouse gas emissions, along with minimal visual disturbance. In addition, ISR 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.

Posted with permission of Visual Capitalist.

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