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Manville, World Mineral, and Celite corporation, now Imerys Inc., opened in the southern hills in Miguelito Canyon. It became (and still is) the largest marine diatomite mine in the world, and at one time was the largest employer in the valley. While owned by Johns Manville, the mine employed more than 900 people at its peak, and built housing for its employees onsite and in town; the houses in town are next to JM park, which the mine donated to the city. Another diatomaceous earth company, Grefco, operated here

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