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A company has halted Marcellus drilling in one northwestern Pennsylvania town after a clay-like material used to expedite the process spilled into a local reservoir.

Hunt Marcellus Operating Co. said it stopped drilling in Johnsonburg after some bentonite gel released into Silver Creek and made its way into a drinking water reservoir controlled by the Johnsonburg Municipal Authority.

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Bentonite is a form of impure clay that easily absorbs water and facilitates gas and oil well drilling.

It wasn’t immediately clear how much of the substance got into the reservoir.

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But water authority chairman Eric Poague said the substance should not affect the safety of the water, though it could make it cloudy, because bentonite is a “non-toxic substance that comes from the earth.”

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