NEVADA CITY, Calif. February 13, 2017 – Many thanks to Jeff Cox – COX Multimedia Group in Nevada City for sharing this video with us. Jeff is a geologist with Holdrege & Kull, you have seen his aerial footage of the Grass Valley sinkhole before.

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NEVADA CITY, Calif. February 13, 2017 – Many thanks to Jeff Cox – COX Multimedia Group in Nevada City for sharing this video with us. Jeff is a geologist with Holdrege & Kull, you have seen his aerial footage of the Grass Valley sinkhole before.